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Re: [PATCH] cpuidle: menu: Avoid computations when result will be discarded
by chengjian (D) 07 Sep '21

07 Sep '21

嗯，我发现了。不过补丁已经合入了。改的话，得 force push 了。我下次会注意的。谢谢提醒。 On 2021/9/7 15:38, Jackie Liu wrote: > 的 From 写错了，不是 5.14-rc7，而是 4.20-rc1 我是检查看 OLK-5.10 是否需要合入的时候发现的。 ----成坚

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[PATCH kernel-4.19 00/31] backport linux-4.19.206
by Yang Yingliang 07 Sep '21

07 Sep '21

*** BLURB HERE *** Ben Skeggs (1): drm/nouveau/disp: power down unused DP links during init Christophe JAILLET (1): xgene-v2: Fix a resource leak in the error handling path of 'xge_probe()' Daniel Borkmann (1): bpf: Do not use ax register in interpreter on div/mod Denis Efremov (1): Revert "floppy: reintroduce O_NDELAY fix" Florian Westphal (1): netfilter: conntrack: collect all entries in one cycle George Kennedy (1): fbmem: add margin check to fb_check_caps() Gerd Rausch (1): net/rds: dma_map_sg is entitled to merge entries Greg Kroah-Hartman (1): Linux 4.19.206 Guangbin Huang (1): net: hns3: fix get wrong pfc_en when query PFC configuration Guenter Roeck (1): ARC: Fix CONFIG_STACKDEPOT Jerome Brunet (1): usb: gadget: u_audio: fix race condition on endpoint stop Johan Hovold (1): Revert "USB: serial: ch341: fix character loss at high transfer rates" Linus Torvalds (1): vt_kdsetmode: extend console locking Mark Yacoub (1): drm: Copy drm_wait_vblank to user before returning Maxim Kiselev (1): net: marvell: fix MVNETA_TX_IN_PRGRS bit number Michał Mirosław (1): opp: remove WARN when no valid OPPs remain Neeraj Upadhyay (1): vringh: Use wiov->used to check for read/write desc order Parav Pandit (2): virtio: Improve vq->broken access to avoid any compiler optimization virtio_pci: Support surprise removal of virtio pci device Peter Collingbourne (1): net: don't unconditionally copy_from_user a struct ifreq for socket ioctls Sasha Neftin (1): e1000e: Fix the max snoop/no-snoop latency for 10M Sean Christopherson (1): KVM: x86/mmu: Treat NX as used (not reserved) for all !TDP shadow MMUs Shai Malin (2): qed: qed ll2 race condition fixes qed: Fix null-pointer dereference in qed_rdma_create_qp() Shreyansh Chouhan (1): ip_gre: add validation for csum_start Stefan Mätje (1): can: usb: esd_usb2: esd_usb2_rx_event(): fix the interchange of the CAN RX and TX error counters Thinh Nguyen (1): usb: dwc3: gadget: Fix dwc3_calc_trbs_left() Tuo Li (1): IB/hfi1: Fix possible null-pointer dereference in _extend_sdma_tx_descs() Wesley Cheng (1): usb: dwc3: gadget: Stop EP0 transfers during pullup disable Xiaolong Huang (1): net: qrtr: fix another OOB Read in qrtr_endpoint_post Zhengjun Zhang (1): USB: serial: option: add new VID/PID to support Fibocom FG150 Makefile | 2 +- arch/arc/kernel/vmlinux.lds.S | 2 + arch/x86/kvm/mmu.c | 11 ++- drivers/block/floppy.c | 27 ++++--- drivers/gpu/drm/drm_ioc32.c | 4 +- drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c | 2 +- drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.h | 1 + .../gpu/drm/nouveau/nvkm/engine/disp/outp.c | 9 +++ drivers/infiniband/hw/hfi1/sdma.c | 9 ++- drivers/net/can/usb/esd_usb2.c | 4 +- drivers/net/ethernet/apm/xgene-v2/main.c | 4 +- .../hisilicon/hns3/hns3pf/hclge_dcb.c | 13 +--- drivers/net/ethernet/intel/e1000e/ich8lan.c | 14 +++- drivers/net/ethernet/intel/e1000e/ich8lan.h | 3 + drivers/net/ethernet/marvell/mvneta.c | 2 +- drivers/net/ethernet/qlogic/qed/qed_ll2.c | 20 ++++++ drivers/net/ethernet/qlogic/qed/qed_rdma.c | 3 +- drivers/opp/of.c | 5 +- drivers/tty/vt/vt_ioctl.c | 11 +-- drivers/usb/dwc3/gadget.c | 23 +++--- drivers/usb/gadget/function/u_audio.c | 5 +- drivers/usb/serial/ch341.c | 1 - drivers/usb/serial/option.c | 2 + drivers/vhost/vringh.c | 2 +- drivers/video/fbdev/core/fbmem.c | 4 ++ drivers/virtio/virtio_pci_common.c | 7 ++ drivers/virtio/virtio_ring.c | 6 +- include/linux/netdevice.h | 4 ++ kernel/bpf/core.c | 32 ++++----- net/ipv4/ip_gre.c | 2 + net/netfilter/nf_conntrack_core.c | 71 ++++++------------- net/qrtr/qrtr.c | 2 +- net/rds/ib_frmr.c | 4 +- net/socket.c | 6 +- 34 files changed, 179 insertions(+), 138 deletions(-) -- 2.25.1

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[PATCH kernel-4.19 0/2] virtio_blk: add discard and write zeroes support
by xuliqun 07 Sep '21

07 Sep '21

virtio_blk: add discard and write zeroes support, mainly for guest os xuliqun (2): virtio_blk: add discard and write zeroes support virtio_blk: fix handling single range discard request drivers/block/virtio_blk.c | 98 ++++++++++++++++++++++++++++++++++++++++- include/uapi/linux/virtio_blk.h | 54 +++++++++++++++++++++++ 2 files changed, 150 insertions(+), 2 deletions(-) -- 2.16.2

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[PATCH kernel-4.19 01/29] delayacct: track delays from thrashing cache pages
by Liu Xinpeng 07 Sep '21

07 Sep '21

mainline inclusion from mainline-v5.4 commit b1d29ba82cf2bc784f4c963ddd6a2cf29e229b33 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47QS2 CVE: NA -------------------------------- Delay accounting already measures the time a task spends in direct reclaim and waiting for swapin, but in low memory situations tasks spend can spend a significant amount of their time waiting on thrashing page cache. This isn't tracked right now. To know the full impact of memory contention on an individual task, measure the delay when waiting for a recently evicted active cache page to read back into memory. Also update tools/accounting/getdelays.c: [hannes@computer accounting]$ sudo ./getdelays -d -p 1 print delayacct stats ON PID 1 CPU count real total virtual total delay total delay average 50318 745000000 847346785 400533713 0.008ms IO count delay total delay average 435 122601218 0ms SWAP count delay total delay average 0 0 0ms RECLAIM count delay total delay average 0 0 0ms THRASHING count delay total delay average 19 12621439 0ms Link: http://lkml.kernel.org/r/20180828172258.3185-4-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes(a)cmpxchg.org> Acked-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Tested-by: Daniel Drake <drake(a)endlessm.com> Tested-by: Suren Baghdasaryan <surenb(a)google.com> Cc: Christopher Lameter <cl(a)linux.com> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: Johannes Weiner <jweiner(a)fb.com> Cc: Mike Galbraith <efault(a)gmx.de> Cc: Peter Enderborg <peter.enderborg(a)sony.com> Cc: Randy Dunlap <rdunlap(a)infradead.org> Cc: Shakeel Butt <shakeelb(a)google.com> Cc: Tejun Heo <tj(a)kernel.org> Cc: Vinayak Menon <vinmenon(a)codeaurora.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Liu Xinpeng <liuxp11(a)chinatelecom.cn> Signed-off-by: Ctyun Kernel <ctyuncommiter01(a)chinatelecom.cn> --- include/linux/delayacct.h | 23 +++++++++++++++++++++++ include/uapi/linux/taskstats.h | 6 +++++- kernel/delayacct.c | 15 +++++++++++++++ mm/filemap.c | 11 +++++++++++ tools/accounting/getdelays.c | 8 +++++++- 5 files changed, 61 insertions(+), 2 deletions(-) diff --git a/include/linux/delayacct.h b/include/linux/delayacct.h index 31c865d..577d1b2 100644 --- a/include/linux/delayacct.h +++ b/include/linux/delayacct.h @@ -57,7 +57,12 @@ struct task_delay_info { u64 freepages_start; u64 freepages_delay; /* wait for memory reclaim */ + + u64 thrashing_start; + u64 thrashing_delay; /* wait for thrashing page */ + u32 freepages_count; /* total count of memory reclaim */ + u32 thrashing_count; /* total count of thrash waits */ }; #endif @@ -76,6 +81,8 @@ struct task_delay_info { extern __u64 __delayacct_blkio_ticks(struct task_struct *); extern void __delayacct_freepages_start(void); extern void __delayacct_freepages_end(void); +extern void __delayacct_thrashing_start(void); +extern void __delayacct_thrashing_end(void); static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) { @@ -156,6 +163,18 @@ static inline void delayacct_freepages_end(void) __delayacct_freepages_end(); } +static inline void delayacct_thrashing_start(void) +{ + if (current->delays) + __delayacct_thrashing_start(); +} + +static inline void delayacct_thrashing_end(void) +{ + if (current->delays) + __delayacct_thrashing_end(); +} + #else static inline void delayacct_set_flag(int flag) {} @@ -182,6 +201,10 @@ static inline void delayacct_freepages_start(void) {} static inline void delayacct_freepages_end(void) {} +static inline void delayacct_thrashing_start(void) +{} +static inline void delayacct_thrashing_end(void) +{} #endif /* CONFIG_TASK_DELAY_ACCT */ diff --git a/include/uapi/linux/taskstats.h b/include/uapi/linux/taskstats.h index b7aa7bb..5e8ca16 100644 --- a/include/uapi/linux/taskstats.h +++ b/include/uapi/linux/taskstats.h @@ -34,7 +34,7 @@ */ -#define TASKSTATS_VERSION 8 +#define TASKSTATS_VERSION 9 #define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN * in linux/sched.h */ @@ -164,6 +164,10 @@ struct taskstats { /* Delay waiting for memory reclaim */ __u64 freepages_count; __u64 freepages_delay_total; + + /* Delay waiting for thrashing page */ + __u64 thrashing_count; + __u64 thrashing_delay_total; }; diff --git a/kernel/delayacct.c b/kernel/delayacct.c index ca8ac28..2a12b98 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -135,9 +135,12 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp; tmp = d->freepages_delay_total + tsk->delays->freepages_delay; d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp; + tmp = d->thrashing_delay_total + tsk->delays->thrashing_delay; + d->thrashing_delay_total = (tmp < d->thrashing_delay_total) ? 0 : tmp; d->blkio_count += tsk->delays->blkio_count; d->swapin_count += tsk->delays->swapin_count; d->freepages_count += tsk->delays->freepages_count; + d->thrashing_count += tsk->delays->thrashing_count; raw_spin_unlock_irqrestore(&tsk->delays->lock, flags); return 0; @@ -169,3 +172,15 @@ void __delayacct_freepages_end(void) &current->delays->freepages_count); } +void __delayacct_thrashing_start(void) +{ + current->delays->thrashing_start = ktime_get_ns(); +} + +void __delayacct_thrashing_end(void) +{ + delayacct_end(&current->delays->lock, + &current->delays->thrashing_start, + &current->delays->thrashing_delay, + &current->delays->thrashing_count); +} diff --git a/mm/filemap.c b/mm/filemap.c index 4cf4b09..6c964d8 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -36,6 +36,7 @@ #include <linux/cleancache.h> #include <linux/shmem_fs.h> #include <linux/rmap.h> +#include <linux/delayacct.h> #include "internal.h" #define CREATE_TRACE_POINTS @@ -1183,8 +1184,15 @@ static inline int wait_on_page_bit_common(wait_queue_head_t *q, { struct wait_page_queue wait_page; wait_queue_entry_t *wait = &wait_page.wait; + bool thrashing = false; int ret = 0; + if (bit_nr == PG_locked && !PageSwapBacked(page) && + !PageUptodate(page) && PageWorkingset(page)) { + delayacct_thrashing_start(); + thrashing = true; + } + init_wait(wait); wait->flags = lock ? WQ_FLAG_EXCLUSIVE : 0; wait->func = wake_page_function; @@ -1223,6 +1231,9 @@ static inline int wait_on_page_bit_common(wait_queue_head_t *q, finish_wait(q, wait); + if (thrashing) + delayacct_thrashing_end(); + /* * A signal could leave PageWaiters set. Clearing it here if * !waitqueue_active would be possible (by open-coding finish_wait), diff --git a/tools/accounting/getdelays.c b/tools/accounting/getdelays.c index 6bf6a20..5ef1c15 100644 --- a/tools/accounting/getdelays.c +++ b/tools/accounting/getdelays.c @@ -203,6 +203,8 @@ static void print_delayacct(struct taskstats *t) "SWAP %15s%15s%15s\n" " %15llu%15llu%15llums\n" "RECLAIM %12s%15s%15s\n" + " %15llu%15llu%15llums\n" + "THRASHING%12s%15s%15s\n" " %15llu%15llu%15llums\n", "count", "real total", "virtual total", "delay total", "delay average", @@ -222,7 +224,11 @@ static void print_delayacct(struct taskstats *t) "count", "delay total", "delay average", (unsigned long long)t->freepages_count, (unsigned long long)t->freepages_delay_total, - average_ms(t->freepages_delay_total, t->freepages_count)); + average_ms(t->freepages_delay_total, t->freepages_count), + "count", "delay total", "delay average", + (unsigned long long)t->thrashing_count, + (unsigned long long)t->thrashing_delay_total, + average_ms(t->thrashing_delay_total, t->thrashing_count)); } static void task_context_switch_counts(struct taskstats *t) -- 1.8.3.1

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[PATCH kernel-4.19 openEuler-1.0-LTS 0/2] virtio_blk: add
by Cheng Jian 06 Sep '21

06 Sep '21

virtio_blk: add discard and write zeroes support, mainly for guest os Changpeng Liu (1): virtio_blk: add discard and write zeroes support Ming Lei (1): virtio_blk: fix handling single range discard request drivers/block/virtio_blk.c | 98 ++++++++++++++++++++++++++++++++- include/uapi/linux/virtio_blk.h | 54 ++++++++++++++++++ 2 files changed, 150 insertions(+), 2 deletions(-) -- 2.25.1

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[PATCH kernel-4.19 openEuler-1.0-LTS] cpuidle: menu: Avoid computations when result will be discarded
by Cheng Jian 06 Sep '21

06 Sep '21

From: "Rafael J. Wysocki" <rafael.j.wysocki(a)intel.com> mainline inclusion from mainline-5.14-rc7 commit f1c8e410cdac5df42a7806e49efde2859a10fecd category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I48J5M CVE: NA ------------------------------------------------- bug: 73520 If the minimum interval taken into account in the average computation loop in get_typical_interval() is less than the expected idle duration determined so far, the resultant average cannot be greater than that value as well and the entire return result of the function is going to be discarded anyway going forward. In that case, it is a waste of time to carry out the remaining computations in get_typical_interval(), so avoid that by returning early if the minimum interval is not below the expected idle duration. [liuyun01(a)kylinos.cn: in theory, this patch did not do much work, but due to the addition of the previous patch eee4b6538e3e ("cpuidle: menu: Avoid overflows when computing variance"), the value of thresh was adjusted from UINT_MAX to INT_MAX, which led to the possibility of dividing by 0, which eventually led to panic.] Fixes: eee4b6538e3e ("cpuidle: menu: Avoid overflows when computing variance") (cherry-picked from f1c8e410cdac5df42a7806e49efde2859a10fecd) Cc: stable Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Signed-off-by: Jackie Liu <liuyun01(a)kylinos.cn> # openEuler_contributor Change-Id: I1109dc2bf03bf5a4fde7185dcd765805eef0a928 Reviewed-on: http://gerrit.kylin.com/c/klinux-4.19/+/13212 Tested-by: kernelbot <kernel-bot(a)kylinos.cn> Signed-off-by: Cheng Jian <cj.chengjian(a)huawei.com> Reviewed-by: Xie XiuQi <xiexiuqi(a)huawei.com> --- drivers/cpuidle/governors/menu.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index c447014d1d72..805435975a5b 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -196,10 +196,11 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev); * of points is below a threshold. If it is... then use the * average of these 8 points as the estimated value. */ -static unsigned int get_typical_interval(struct menu_device *data) +static unsigned int get_typical_interval(struct menu_device *data, + unsigned int predicted_us) { int i, divisor; - unsigned int max, thresh, avg; + unsigned int max, min, thresh, avg; uint64_t sum, variance; thresh = INT_MAX; /* Discard outliers above this value */ @@ -207,6 +208,7 @@ static unsigned int get_typical_interval(struct menu_device *data) again: /* First calculate the average of past intervals */ + min = UINT_MAX; max = 0; sum = 0; divisor = 0; @@ -217,8 +219,18 @@ static unsigned int get_typical_interval(struct menu_device *data) divisor++; if (value > max) max = value; + if (value < min) + min = value; } } + + /* + * If the result of the computation is going to be discarded anyway, + * avoid the computation altogether. + */ + if (min >= predicted_us) + return UINT_MAX; + if (divisor == INTERVALS) avg = sum >> INTERVAL_SHIFT; else @@ -318,7 +330,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev, data->correction_factor[data->bucket], RESOLUTION * DECAY); - expected_interval = get_typical_interval(data); + expected_interval = get_typical_interval(data, data->predicted_us); expected_interval = min(expected_interval, data->next_timer_us); first_idx = 0; -- 2.25.1

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[PATCH openEuler-1.0-LTS 01/30] mm: workingset: tell cache transitions from workingset thrashing
by Liu Xinpeng 06 Sep '21

06 Sep '21

mainline inclusion from mainline-v5.4 commit 1899ad18c6072d689896badafb81267b0a1092a4 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47QS2 CVE: NA -------------------------------- Refaults happen during transitions between workingsets as well as in-place thrashing. Knowing the difference between the two has a range of applications, including measuring the impact of memory shortage on the system performance, as well as the ability to smarter balance pressure between the filesystem cache and the swap-backed workingset. During workingset transitions, inactive cache refaults and pushes out established active cache. When that active cache isn't stale, however, and also ends up refaulting, that's bonafide thrashing. Introduce a new page flag that tells on eviction whether the page has been active or not in its lifetime. This bit is then stored in the shadow entry, to classify refaults as transitioning or thrashing. How many page->flags does this leave us with on 32-bit? 20 bits are always page flags 21 if you have an MMU 23 with the zone bits for DMA, Normal, HighMem, Movable 29 with the sparsemem section bits 30 if PAE is enabled 31 with this patch. So on 32-bit PAE, that leaves 1 bit for distinguishing two NUMA nodes. If that's not enough, the system can switch to discontigmem and re-gain the 6 or 7 sparsemem section bits. Link: http://lkml.kernel.org/r/20180828172258.3185-3-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes(a)cmpxchg.org> Acked-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Tested-by: Daniel Drake <drake(a)endlessm.com> Tested-by: Suren Baghdasaryan <surenb(a)google.com> Cc: Christopher Lameter <cl(a)linux.com> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: Johannes Weiner <jweiner(a)fb.com> Cc: Mike Galbraith <efault(a)gmx.de> Cc: Peter Enderborg <peter.enderborg(a)sony.com> Cc: Randy Dunlap <rdunlap(a)infradead.org> Cc: Shakeel Butt <shakeelb(a)google.com> Cc: Tejun Heo <tj(a)kernel.org> Cc: Vinayak Menon <vinmenon(a)codeaurora.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Liu Xinpeng <liuxp11(a)chinatelecom.cn> Signed-off-by: Ctyun Kernel <ctyuncommiter01(a)chinatelecom.cn> --- include/linux/mmzone.h | 1 + include/linux/page-flags.h | 5 ++- include/linux/swap.h | 2 +- include/trace/events/mmflags.h | 1 + mm/filemap.c | 9 ++-- mm/huge_memory.c | 1 + mm/migrate.c | 2 + mm/swap_state.c | 1 + mm/vmscan.c | 1 + mm/vmstat.c | 1 + mm/workingset.c | 94 +++++++++++++++++++++++++++--------------- 11 files changed, 76 insertions(+), 42 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index e7d2bca..b55dd22 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -164,6 +164,7 @@ enum node_stat_item { NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */ WORKINGSET_REFAULT, WORKINGSET_ACTIVATE, + WORKINGSET_RESTORE, WORKINGSET_NODERECLAIM, NR_ANON_MAPPED, /* Mapped anonymous pages */ NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 7eb776a..97c0918 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -69,13 +69,14 @@ */ enum pageflags { PG_locked, /* Page is locked. Don't touch. */ - PG_error, PG_referenced, PG_uptodate, PG_dirty, PG_lru, PG_active, + PG_workingset, PG_waiters, /* Page has waiters, check its waitqueue. Must be bit #7 and in the same byte as "PG_locked" */ + PG_error, PG_slab, PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/ PG_arch_1, @@ -281,6 +282,8 @@ static inline int PagePoisoned(const struct page *page) PAGEFLAG(LRU, lru, PF_HEAD) __CLEARPAGEFLAG(LRU, lru, PF_HEAD) PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD) TESTCLEARFLAG(Active, active, PF_HEAD) +PAGEFLAG(Workingset, workingset, PF_HEAD) + TESTCLEARFLAG(Workingset, workingset, PF_HEAD) __PAGEFLAG(Slab, slab, PF_NO_TAIL) __PAGEFLAG(SlobFree, slob_free, PF_NO_TAIL) PAGEFLAG(Checked, checked, PF_NO_COMPOUND) /* Used by some filesystems */ diff --git a/include/linux/swap.h b/include/linux/swap.h index b7cfad3..12a39b2 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -322,7 +322,7 @@ struct vma_swap_readahead { /* linux/mm/workingset.c */ void *workingset_eviction(struct address_space *mapping, struct page *page); -bool workingset_refault(void *shadow); +void workingset_refault(struct page *page, void *shadow); void workingset_activation(struct page *page); /* Do not use directly, use workingset_lookup_update */ diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index b817bf1..edc9adf 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -88,6 +88,7 @@ {1UL << PG_dirty, "dirty" }, \ {1UL << PG_lru, "lru" }, \ {1UL << PG_active, "active" }, \ + {1UL << PG_workingset, "workingset" }, \ {1UL << PG_slab, "slab" }, \ {1UL << PG_owner_priv_1, "owner_priv_1" }, \ {1UL << PG_arch_1, "arch_1" }, \ diff --git a/mm/filemap.c b/mm/filemap.c index f578d4e..fd906c1 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1023,12 +1023,9 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping, * data from the working set, only to cache data that will * get overwritten with something else, is a waste of memory. */ - if (!(gfp_mask & __GFP_WRITE) && - shadow && workingset_refault(shadow)) { - SetPageActive(page); - workingset_activation(page); - } else - ClearPageActive(page); + WARN_ON_ONCE(PageActive(page)); + if (!(gfp_mask & __GFP_WRITE) && shadow) + workingset_refault(page, shadow); if (!PagePercpuRef(page)) lru_cache_add(page); } diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 31f1c58..f71b7a7 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2531,6 +2531,7 @@ static void __split_huge_page_tail(struct page *head, int tail, (1L << PG_mlocked) | (1L << PG_uptodate) | (1L << PG_active) | + (1L << PG_workingset) | (1L << PG_locked) | (1L << PG_unevictable) | (1L << PG_dirty))); diff --git a/mm/migrate.c b/mm/migrate.c index 90aa493..a41ef7f 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -684,6 +684,8 @@ void migrate_page_states(struct page *newpage, struct page *page) SetPageActive(newpage); } else if (TestClearPageUnevictable(page)) SetPageUnevictable(newpage); + if (PageWorkingset(page)) + SetPageWorkingset(newpage); if (PageChecked(page)) SetPageChecked(newpage); if (PageMappedToDisk(page)) diff --git a/mm/swap_state.c b/mm/swap_state.c index 2137e2d..3b538ef 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -460,6 +460,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, /* * Initiate read into locked page and return. */ + SetPageWorkingset(new_page); lru_cache_add_anon(new_page); *new_page_allocated = true; return new_page; diff --git a/mm/vmscan.c b/mm/vmscan.c index b381c89..abcffa3 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2188,6 +2188,7 @@ static void shrink_active_list(unsigned long nr_to_scan, } ClearPageActive(page); /* we are de-activating */ + SetPageWorkingset(page); list_add(&page->lru, &l_inactive); } diff --git a/mm/vmstat.c b/mm/vmstat.c index 96028cc..e183cb2 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1145,6 +1145,7 @@ int fragmentation_index(struct zone *zone, unsigned int order) "nr_isolated_file", "workingset_refault", "workingset_activate", + "workingset_restore", "workingset_nodereclaim", "nr_anon_pages", "nr_mapped", diff --git a/mm/workingset.c b/mm/workingset.c index a1f61b3..039eea7 100644 --- a/mm/workingset.c +++ b/mm/workingset.c @@ -121,7 +121,7 @@ * the only thing eating into inactive list space is active pages. * * - * Activating refaulting pages + * Refaulting inactive pages * * All that is known about the active list is that the pages have been * accessed more than once in the past. This means that at any given @@ -134,6 +134,10 @@ * used less frequently than the refaulting page - or even not used at * all anymore. * + * That means if inactive cache is refaulting with a suitable refault + * distance, we assume the cache workingset is transitioning and put + * pressure on the current active list. + * * If this is wrong and demotion kicks in, the pages which are truly * used more frequently will be reactivated while the less frequently * used once will be evicted from memory. @@ -141,6 +145,14 @@ * But if this is right, the stale pages will be pushed out of memory * and the used pages get to stay in cache. * + * Refaulting active pages + * + * If on the other hand the refaulting pages have recently been + * deactivated, it means that the active list is no longer protecting + * actively used cache from reclaim. The cache is NOT transitioning to + * a different workingset; the existing workingset is thrashing in the + * space allocated to the page cache. + * * * Implementation * @@ -156,8 +168,7 @@ */ #define EVICTION_SHIFT (RADIX_TREE_EXCEPTIONAL_ENTRY + \ - NODES_SHIFT + \ - MEM_CGROUP_ID_SHIFT) + 1 + NODES_SHIFT + MEM_CGROUP_ID_SHIFT) #define EVICTION_MASK (~0UL >> EVICTION_SHIFT) /* @@ -170,23 +181,28 @@ */ static unsigned int bucket_order __read_mostly; -static void *pack_shadow(int memcgid, pg_data_t *pgdat, unsigned long eviction) +static void *pack_shadow(int memcgid, pg_data_t *pgdat, unsigned long eviction, + bool workingset) { eviction >>= bucket_order; eviction = (eviction << MEM_CGROUP_ID_SHIFT) | memcgid; eviction = (eviction << NODES_SHIFT) | pgdat->node_id; + eviction = (eviction << 1) | workingset; eviction = (eviction << RADIX_TREE_EXCEPTIONAL_SHIFT); return (void *)(eviction | RADIX_TREE_EXCEPTIONAL_ENTRY); } static void unpack_shadow(void *shadow, int *memcgidp, pg_data_t **pgdat, - unsigned long *evictionp) + unsigned long *evictionp, bool *workingsetp) { unsigned long entry = (unsigned long)shadow; int memcgid, nid; + bool workingset; entry >>= RADIX_TREE_EXCEPTIONAL_SHIFT; + workingset = entry & 1; + entry >>= 1; nid = entry & ((1UL << NODES_SHIFT) - 1); entry >>= NODES_SHIFT; memcgid = entry & ((1UL << MEM_CGROUP_ID_SHIFT) - 1); @@ -195,6 +211,7 @@ static void unpack_shadow(void *shadow, int *memcgidp, pg_data_t **pgdat, *memcgidp = memcgid; *pgdat = NODE_DATA(nid); *evictionp = entry << bucket_order; + *workingsetp = workingset; } /** @@ -207,8 +224,8 @@ static void unpack_shadow(void *shadow, int *memcgidp, pg_data_t **pgdat, */ void *workingset_eviction(struct address_space *mapping, struct page *page) { - struct mem_cgroup *memcg = page_memcg(page); struct pglist_data *pgdat = page_pgdat(page); + struct mem_cgroup *memcg = page_memcg(page); int memcgid = mem_cgroup_id(memcg); unsigned long eviction; struct lruvec *lruvec; @@ -220,30 +237,30 @@ void *workingset_eviction(struct address_space *mapping, struct page *page) lruvec = mem_cgroup_lruvec(pgdat, memcg); eviction = atomic_long_inc_return(&lruvec->inactive_age); - return pack_shadow(memcgid, pgdat, eviction); + return pack_shadow(memcgid, pgdat, eviction, PageWorkingset(page)); } /** * workingset_refault - evaluate the refault of a previously evicted page + * @page: the freshly allocated replacement page * @shadow: shadow entry of the evicted page * * Calculates and evaluates the refault distance of the previously * evicted page in the context of the node it was allocated in. - * - * Returns %true if the page should be activated, %false otherwise. */ -bool workingset_refault(void *shadow) +void workingset_refault(struct page *page, void *shadow) { unsigned long refault_distance; + struct pglist_data *pgdat; unsigned long active_file; struct mem_cgroup *memcg; unsigned long eviction; struct lruvec *lruvec; unsigned long refault; - struct pglist_data *pgdat; + bool workingset; int memcgid; - unpack_shadow(shadow, &memcgid, &pgdat, &eviction); + unpack_shadow(shadow, &memcgid, &pgdat, &eviction, &workingset); rcu_read_lock(); /* @@ -263,41 +280,50 @@ bool workingset_refault(void *shadow) * configurations instead. */ memcg = mem_cgroup_from_id(memcgid); - if (!mem_cgroup_disabled() && !memcg) { - rcu_read_unlock(); - return false; - } + if (!mem_cgroup_disabled() && !memcg) + goto out; lruvec = mem_cgroup_lruvec(pgdat, memcg); refault = atomic_long_read(&lruvec->inactive_age); active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE, MAX_NR_ZONES); /* + * Calculate the refault distance * The unsigned subtraction here gives an accurate distance - * across inactive_age overflows in most cases. - * - * There is a special case: usually, shadow entries have a - * short lifetime and are either refaulted or reclaimed along - * with the inode before they get too old. But it is not - * impossible for the inactive_age to lap a shadow entry in - * the field, which can then can result in a false small - * refault distance, leading to a false activation should this - * old entry actually refault again. However, earlier kernels - * used to deactivate unconditionally with *every* reclaim - * invocation for the longest time, so the occasional - * inappropriate activation leading to pressure on the active - * list is not a problem. + * across inactive_age overflows in most cases. There is a + * special case: usually, shadow entries have a short lifetime + * and are either refaulted or reclaimed along with the inode + * before they get too old. But it is not impossible for the + * inactive_age to lap a shadow entry in the field, which can + * then result in a false small refault distance, leading to a + * false activation should this old entry actually refault + * again. However, earlier kernels used to deactivate + * unconditionally with *every* reclaim invocation for the + * longest time, so the occasional inappropriate activation + * leading to pressure on the active list is not a problem. */ refault_distance = (refault - eviction) & EVICTION_MASK; inc_lruvec_state(lruvec, WORKINGSET_REFAULT); - if (refault_distance <= active_file) { - inc_lruvec_state(lruvec, WORKINGSET_ACTIVATE); - rcu_read_unlock(); - return true; + /* + * Compare the distance to the existing workingset size. We + * don't act on pages that couldn't stay resident even if all + * the memory was available to the page cache. + */ + if (refault_distance > active_file) + goto out; + + SetPageActive(page); + atomic_long_inc(&lruvec->inactive_age); + inc_lruvec_state(lruvec, WORKINGSET_ACTIVATE); + + /* Page was active prior to eviction */ + if (workingset) { + SetPageWorkingset(page); + inc_lruvec_state(lruvec, WORKINGSET_RESTORE); } +out: rcu_read_unlock(); - return false; } /** -- 1.8.3.1

1 29

[PATCH openEuler-21.09 01/38] crypto: hisilicon/sec - fix the process of disabling sva prefetching
by Zheng Zengkai 04 Sep '21

04 Sep '21

From: Kai Ye <yekai13(a)huawei.com> mainline inclusion from mainline-master commit 66192b2e3fd8ab97ed518d6c0240e26655a20b4b category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I475XT?from=project-issue CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/d… ---------------------------------------------------------------------- The open interface of the sva prefetching function is distinguish the chip version. But the close interface of the sva prefetching function doesn't distinguish the chip version. As a result, the sva prefetching close operation is also performed on Kunpeng920, those registers are important on Kunpeng920, which eventually leads to abnormal hardware problems. So need to fix it immediately. Signed-off-by: Kai Ye <yekai13(a)huawei.com> Signed-off-by: Herbert Xu <herbert(a)gondor.apana.org.au> Reviewed-by: Hao Fang <fanghao11(a)huawei.com> Reviewed-by: Mingqiang Ling <lingmingqiang(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> --- drivers/crypto/hisilicon/sec2/sec_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c index d120ce3e34ed..490db7bccf61 100644 --- a/drivers/crypto/hisilicon/sec2/sec_main.c +++ b/drivers/crypto/hisilicon/sec2/sec_main.c @@ -364,6 +364,9 @@ static void sec_close_sva_prefetch(struct hisi_qm *qm) u32 val; int ret; + if (qm->ver < QM_HW_V3) + return; + val = readl_relaxed(qm->io_base + SEC_PREFETCH_CFG); val |= SEC_PREFETCH_DISABLE; writel(val, qm->io_base + SEC_PREFETCH_CFG); -- 2.20.1

1 37

[PATCH kernel-4.19] itrace: add missing itrace_hardirqs_ignore() calls
by Yang Yingliang 03 Sep '21

03 Sep '21

From: Bixuan Cui <cuibixuan(a)huawei.com> ascend inclusion category: bugfix bugzilla: NA CVE: NA --------------------------------------------- There is an anomalous statistics in itrace irqsoff: max_time:3945(us) caller:__do_softirq+0x8c/0x310 max_time:7996(us) caller:__do_softirq+0x8c/0x310 Use function tracer to trace: stress-ng-cpu-3723 [011] d... 2817.510377: rcu_nmi_exit <-rcu_irq_exit stress-ng-cpu-3723 [011] d... 2817.510377: rcu_dynticks_curr_cpu_in_eqs <-rcu_nmi_exit stress-ng-cpu-3723 [011] d... 2817.514356: gic_handle_irq <-el0_irq_naked stress-ng-cpu-3723 [011] d... 2817.514356: __handle_domain_irq <-gic_handle_irq ... The per-cpu interrupt is enabled after irq_handler in el0_irq_naked() is executed. However, the itrace does not add the irqsoff monitoring to el0_irq_naked. And the same omission appears in the following files: arch/arm64/include/asm/daifflags.h arch/arm64/kernel/entry.S arch/arm64/kernel/syscall.c arch/arm64/mm/fault.c Add missing itrace_hardirqs_ignore() calls into it. Signed-off-by: Bixuan Cui <cuibixuan(a)huawei.com> Reviewed-by: Ding Tianhong <dingtianhong(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- arch/arm64/include/asm/daifflags.h | 3 +++ arch/arm64/kernel/entry.S | 9 +++++++++ arch/arm64/kernel/syscall.c | 3 +++ arch/arm64/mm/fault.c | 6 +++++- 4 files changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/daifflags.h b/arch/arm64/include/asm/daifflags.h index 1230923b032dd..1d832814eae8f 100644 --- a/arch/arm64/include/asm/daifflags.h +++ b/arch/arm64/include/asm/daifflags.h @@ -72,6 +72,9 @@ static inline void local_daif_restore(unsigned long flags) if (!irq_disabled) { trace_hardirqs_on(); +#ifdef CONFIG_ITRACE_IRQSOFF + itrace_hardirqs_ignore(); +#endif if (system_uses_irq_prio_masking()) { gic_write_pmr(GIC_PRIO_IRQON); diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 2eb1b657de2fb..2c9b8d94d3677 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -718,6 +718,9 @@ alternative_else_nop_endif #endif bl trace_hardirqs_on 1: +#endif +#ifdef CONFIG_ITRACE_IRQSOFF + bl itrace_hardirqs_ignore #endif kernel_exit 1 @@ -954,6 +957,9 @@ el0_irq_naked: #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_on +#endif +#ifdef CONFIG_ITRACE_IRQSOFF + bl itrace_hardirqs_ignore #endif b ret_to_user ENDPROC(el0_irq) @@ -989,6 +995,9 @@ work_pending: bl do_notify_resume #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_on // enabled while in userspace +#endif +#ifdef CONFIG_ITRACE_IRQSOFF + bl itrace_hardirqs_ignore #endif ldr x1, [tsk, #TSK_TI_FLAGS] // re-check for single-step b finish_ret_to_user diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index f2d2dbbbfca20..964df44d7429a 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -131,6 +131,9 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr, * the SPSR. */ trace_hardirqs_on(); +#ifdef CONFIG_ITRACE_IRQSOFF + itrace_hardirqs_ignore(); +#endif return; } local_daif_restore(DAIF_PROCCTX); diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 08040fe73199a..4e7aaa658d636 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -1094,8 +1094,12 @@ asmlinkage int __exception do_debug_exception(unsigned long addr_if_watchpoint, rv = 0; } - if (interrupts_enabled(regs)) + if (interrupts_enabled(regs)) { trace_hardirqs_on(); +#ifdef CONFIG_ITRACE_IRQSOFF + itrace_hardirqs_ignore(); +#endif + } return rv; } -- 2.25.1

1 0

[PATCH kernel-4.19 1/3] mm/filemap.c: fix a data race in filemap_fault()
by Yang Yingliang 03 Sep '21

03 Sep '21

From: "Kirill A. Shutemov" <kirill(a)shutemov.name> mainline inclusion from mainline-v5.9-rc1 commit e630bfac79456d3acd22c9286b50e83aafb7a07c category: bugfix bugzilla: 41542 CVE: NA ----------------------------------------------- struct file_ra_state ra.mmap_miss could be accessed concurrently during page faults as noticed by KCSAN, BUG: KCSAN: data-race in filemap_fault / filemap_map_pages write to 0xffff9b1700a2c1b4 of 4 bytes by task 3292 on cpu 30: filemap_fault+0x920/0xfc0 do_sync_mmap_readahead at mm/filemap.c:2384 (inlined by) filemap_fault at mm/filemap.c:2486 __xfs_filemap_fault+0x112/0x3e0 [xfs] xfs_filemap_fault+0x74/0x90 [xfs] __do_fault+0x9e/0x220 do_fault+0x4a0/0x920 __handle_mm_fault+0xc69/0xd00 handle_mm_fault+0xfc/0x2f0 do_page_fault+0x263/0x6f9 page_fault+0x34/0x40 read to 0xffff9b1700a2c1b4 of 4 bytes by task 3313 on cpu 32: filemap_map_pages+0xc2e/0xd80 filemap_map_pages at mm/filemap.c:2625 do_fault+0x3da/0x920 __handle_mm_fault+0xc69/0xd00 handle_mm_fault+0xfc/0x2f0 do_page_fault+0x263/0x6f9 page_fault+0x34/0x40 Reported by Kernel Concurrency Sanitizer on: CPU: 32 PID: 3313 Comm: systemd-udevd Tainted: G W L 5.5.0-next-20200210+ #1 Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019 ra.mmap_miss is used to contribute the readahead decisions, a data race could be undesirable. Both the read and write is only under non-exclusive mmap_sem, two concurrent writers could even underflow the counter. Fix the underflow by writing to a local variable before committing a final store to ra.mmap_miss given a small inaccuracy of the counter should be acceptable. Signed-off-by: Kirill A. Shutemov <kirill(a)shutemov.name> Signed-off-by: Qian Cai <cai(a)lca.pw> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Tested-by: Qian Cai <cai(a)lca.pw> Reviewed-by: Matthew Wilcox (Oracle) <willy(a)infradead.org> Cc: Marco Elver <elver(a)google.com> Link: http://lkml.kernel.org/r/20200211030134.1847-1-cai@lca.pw Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Conflicts: mm/filemap.c [Peng Liu: cherry-pick from e630bfac79456d3acd22c9286b50e83aafb7a07c] Signed-off-by: Peng Liu <liupeng256(a)huawei.com> Reviewed-by: tong tiangen <tongtiangen(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- mm/filemap.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 5c33c40e80192..4cf4b096d5b63 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2528,6 +2528,7 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma, pgoff_t offset) { struct address_space *mapping = file->f_mapping; + unsigned int mmap_miss; /* If we don't want any read-ahead, don't bother */ if (vma->vm_flags & VM_RAND_READ) @@ -2542,14 +2543,15 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma, } /* Avoid banging the cache line if not needed */ - if (ra->mmap_miss < MMAP_LOTSAMISS * 10) - ra->mmap_miss++; + mmap_miss = READ_ONCE(ra->mmap_miss); + if (mmap_miss < MMAP_LOTSAMISS * 10) + WRITE_ONCE(ra->mmap_miss, ++mmap_miss); /* * Do we miss much more than hit in this file? If so, * stop bothering with read-ahead. It will only hurt. */ - if (ra->mmap_miss > MMAP_LOTSAMISS) + if (mmap_miss > MMAP_LOTSAMISS) return; /* @@ -2572,12 +2574,14 @@ static void do_async_mmap_readahead(struct vm_area_struct *vma, pgoff_t offset) { struct address_space *mapping = file->f_mapping; + unsigned int mmap_miss; /* If we don't want any read-ahead, don't bother */ if (vma->vm_flags & VM_RAND_READ) return; - if (ra->mmap_miss > 0) - ra->mmap_miss--; + mmap_miss = READ_ONCE(ra->mmap_miss); + if (mmap_miss) + WRITE_ONCE(ra->mmap_miss, --mmap_miss); if (PageReadahead(page)) page_cache_async_readahead(mapping, ra, file, page, offset, ra->ra_pages); @@ -2737,6 +2741,7 @@ void filemap_map_pages(struct vm_fault *vmf, pgoff_t last_pgoff = start_pgoff; unsigned long max_idx; struct page *head, *page; + unsigned int mmap_miss = READ_ONCE(file->f_ra.mmap_miss); rcu_read_lock(); radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start_pgoff) { @@ -2784,8 +2789,8 @@ void filemap_map_pages(struct vm_fault *vmf, if (page->index >= max_idx) goto unlock; - if (file->f_ra.mmap_miss > 0) - file->f_ra.mmap_miss--; + if (mmap_miss > 0) + mmap_miss--; vmf->address += (iter.index - last_pgoff) << PAGE_SHIFT; if (vmf->pte) @@ -2807,6 +2812,7 @@ void filemap_map_pages(struct vm_fault *vmf, break; } rcu_read_unlock(); + WRITE_ONCE(file->f_ra.mmap_miss, mmap_miss); } EXPORT_SYMBOL(filemap_map_pages); -- 2.25.1

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