December 2023 - Kernel - mailweb.openeuler.org

[PATCH OLK-6.6 v6 0/7] memcg reclaim and cgroup kill
by Lu Jialin 14 Dec '23

14 Dec '23

Lu Jialin (7): cgroup: Export cgroup.kill from cgroupv2 to cgroupv1 memcg: Export memcg.{min/low/high} from cgroupv2 to cgroupv1 memcg: Export memory.events{local} from cgroupv2 to cgroupv1 memcg: enable memcg async reclaim memcg: export high_async_ratio to userland memcg: introduce per-memcg reclaim interface config: enable CONFIG_MEMCG_V1_RECLAIM and CONFIG_CGROUP_V1_KILL arch/arm64/configs/openeuler_defconfig | 2 + arch/x86/configs/openeuler_defconfig | 2 + include/linux/memcontrol.h | 8 +- init/Kconfig | 10 ++ kernel/cgroup/cgroup-internal.h | 3 + kernel/cgroup/cgroup-v1.c | 7 + kernel/cgroup/cgroup.c | 4 +- mm/memcontrol.c | 189 ++++++++++++++++++++++++- 8 files changed, 219 insertions(+), 6 deletions(-) -- 2.34.1

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[PATCH v7 OLK-6.6 0/5] Support Qos Scheduler
by Wenyu Huang 14 Dec '23

14 Dec '23

Zhang Qiao (5): sched: Introduce qos scheduler for co-location sched: Throttle qos cfs_rq when current cpu is running online task sched: Support kill boost for offline task sched: Introduce handle priority reversion mechanism sched: Enable qos scheduler config arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + include/linux/cgroup.h | 4 + include/linux/resume_user_mode.h | 5 + include/linux/sched.h | 11 + init/Kconfig | 12 + kernel/cgroup/cgroup.c | 20 ++ kernel/sched/core.c | 155 ++++++++++ kernel/sched/fair.c | 378 ++++++++++++++++++++++++- kernel/sched/sched.h | 12 + kernel/signal.c | 3 + 11 files changed, 601 insertions(+), 1 deletion(-) -- 2.34.1

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[PATCH OLK-6.6 v5 0/7] memcg reclaim and cgroup kill
by Lu Jialin 13 Dec '23

13 Dec '23

Lu Jialin (7): cgroup: Export cgroup.kill from cgroupv2 to cgroupv1 memcg: Export memcg.{min/low/high} from cgroupv2 to cgroupv1 memcg: Export memory.events{local} from cgroupv2 to cgroupv1 memcg: enable memcg async reclaim memcg: export high_async_ratio to userland memcg: introduce per-memcg reclaim interface config: enable CONFIG_MEMCG_V1_RECLAIM and CONFIG_CGROUP_V1_KILL arch/arm64/configs/openeuler_defconfig | 2 + arch/x86/configs/openeuler_defconfig | 2 + include/linux/memcontrol.h | 8 +- init/Kconfig | 10 ++ kernel/cgroup/cgroup-internal.h | 3 + kernel/cgroup/cgroup-v1.c | 7 + kernel/cgroup/cgroup.c | 4 +- mm/memcontrol.c | 188 ++++++++++++++++++++++++- 8 files changed, 218 insertions(+), 6 deletions(-) -- 2.34.1

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[PATCH OLK-5.10 0/3] md: do not return existing mddevs from mddev_find_or_alloc
by Li Lingfeng 13 Dec '23

13 Dec '23

Do not return existing mddevs from mddev_find_or_alloc. Christoph Hellwig (3): md: factor out a mddev_alloc_unit helper from mddev_find md: refactor mddev_find_or_alloc md: do not return existing mddevs from mddev_find_or_alloc drivers/md/md.c | 139 +++++++++++++++++++++++------------------------- 1 file changed, 67 insertions(+), 72 deletions(-) -- 2.31.1

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[PATCH OLK-6.6 0/8] Spark SQL scenario bpf readahead optimization synchronization to OLK-6.6
by ZhaoLong Wang 13 Dec '23

13 Dec '23

CONFIG: CONFIG_DEBUG_INFO_BTF=y CONFIG_BPF_SYSCALL=y CONFIG_NF_CONNTRACK=y CONFIG_NF_CONNTRACK_MARK=y Hou Tao (5): vfs: add bare tracepoints for vfs read and release fs: add helper fs_file_read_do_trace() xfs: add trace for read and release of regular file ext4: add trace for the read and release of regular file selftests/bpf: add demo for file read pattern detection Yufen Yu (1): readahead: introduce FMODE_CTL_WILLNEED to read first 2MB of file ZhaoLong Wang (2): VFS: Rolling Back the fmode macro definition and structure members selftests/bpf: Update the demo file_read_pattern to run on libbpf 1.0+ fs/ext4/file.c | 4 + fs/read_write.c | 38 +++++ fs/xfs/xfs_file.c | 3 + include/linux/fs.h | 37 +++++ include/trace/events/fs.h | 33 +++++ mm/readahead.c | 40 ++++- tools/testing/selftests/bpf/Makefile | 1 + .../testing/selftests/bpf/file_read_pattern.c | 73 +++++++++ .../bpf/progs/file_read_pattern_prog.c | 138 ++++++++++++++++++ 9 files changed, 366 insertions(+), 1 deletion(-) create mode 100644 include/trace/events/fs.h create mode 100644 tools/testing/selftests/bpf/file_read_pattern.c create mode 100644 tools/testing/selftests/bpf/progs/file_read_pattern_prog.c -- 2.39.2

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[PATCH v7 OLK-6.6 0/5] Support Qos Scheduler
by Wenyu Huang 13 Dec '23

13 Dec '23

Zhang Qiao (5): sched: Introduce qos scheduler for co-location sched: Throttle qos cfs_rq when current cpu is running online task sched: Support kill boost for offline task sched: Introduce handle priority reversion mechanism sched: Enable qos scheduler config arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + include/linux/cgroup.h | 4 + include/linux/resume_user_mode.h | 5 + include/linux/sched.h | 11 + init/Kconfig | 12 + kernel/cgroup/cgroup.c | 21 ++ kernel/sched/core.c | 155 ++++++++++ kernel/sched/fair.c | 378 ++++++++++++++++++++++++- kernel/sched/sched.h | 12 + kernel/signal.c | 3 + 11 files changed, 602 insertions(+), 1 deletion(-) -- 2.34.1

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[PATCH OLK-5.10] mm/mempolicy: check preferred_node rather than nodes for MPOL_PREFERRED
by Wupeng Ma 13 Dec '23

13 Dec '23

From: Ma Wupeng <mawupeng1(a)huawei.com> Commit b27abaccf8e8 ("mm/mempolicy: add MPOL_PREFERRED_MANY for multiple preferred nodes") add MPOL_PREFERRED_MANY which will return -1 if page node id is not in nodes. However this is useful for linux-v5.15 since commit 269fbe72cded ("mm/mempolicy: use unified 'nodes' for bind/interleave/prefer policies") already unify bind/prefer policies. While this patch does not exists during backport. To fix this, drop checking v.nodes for prefer. Ma Wupeng (1): mm/mempolicy: check preferred_node rather than nodes for MPOL_PREFERRED mm/mempolicy.c | 2 -- 1 file changed, 2 deletions(-) -- 2.25.1

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[PATCH OLK-5.10] locking/osq_lock: Avoid false sharing in optimistic_spin_node
by Zeng Heng 13 Dec '23

13 Dec '23

hulk inclusion category: performance bugzilla: https://gitee.com/openeuler/kernel/issues/I8MV01 -------------------------------- Using the UnixBench test suite, we clearly find that osq_lock() cause extremely high overheads with perf tool in the File Copy items: Overhead Shared Object Symbol 94.25% [kernel] [k] osq_lock 0.74% [kernel] [k] rwsem_spin_on_owner 0.32% [kernel] [k] filemap_get_read_batch In response to this, we conducted an analysis and made some gains: In the prologue of osq_lock(), it set `cpu` member of percpu struct optimistic_spin_node with the local cpu id, after that the value of the percpu struct would never change in fact. Based on that, we can regard the `cpu` member as a constant variable. In the meanwhile, other members of the percpu struct like next, prev and locked are frequently modified by osq_lock() and osq_unlock() which are called by rwsem, mutex and so on. However, that would invalidate the cache of the cpu member on other CPUs. Therefore, we can place padding here and split them into different cache lines to avoid cache misses when the next CPU is spinning to check other node's cpu member by vcpu_is_preempted(). Here provide the UnixBench full-core test result as below: Machine Intel(R) Xeon(R) Gold 6248 CPU, 40 cores, 80 threads Run the command of "./Run -c 80 -i 3" 10 times and take the average. System Benchmarks Index Values Without Patch With Patch Diff Dhrystone 2 using register variables 185876.43 185945.41 0.04% Double-Precision Whetstone 79637.27 79659.29 0.03% Execl Throughput 9909.61 10576.06 6.73% File Copy 1024 bufsize 2000 maxblocks 1723.01 2086.08 21.07% File Copy 256 bufsize 500 maxblocks 1150.24 1338.21 16.34% File Copy 4096 bufsize 8000 maxblocks 3719.19 4011.99 7.87% Pipe Throughput 66184.84 66025.25 -0.24% Pipe-based Context Switching 30606.18 31074.21 1.53% Process Creation 9442.48 9450.77 0.09% Shell Scripts (1 concurrent) 44526.52 46548.54 4.54% Shell Scripts (8 concurrent) 42903.96 45718.56 6.56% System Call Overhead 3645.20 3717.42 1.98% ======== System Benchmarks Index Score 15126.87 15931.29 5.32% Signed-off-by: Zeng Heng <zengheng4(a)huawei.com> --- include/linux/osq_lock.h | 2 +- kernel/locking/osq_lock.c | 8 +++++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/include/linux/osq_lock.h b/include/linux/osq_lock.h index 5581dbd3bd34..deb90ad5f560 100644 --- a/include/linux/osq_lock.h +++ b/include/linux/osq_lock.h @@ -9,7 +9,7 @@ struct optimistic_spin_node { struct optimistic_spin_node *next, *prev; int locked; /* 1 if lock acquired */ - int cpu; /* encoded CPU # + 1 value */ + int cpu ____cacheline_aligned; /* encoded CPU # + 1 value */ }; struct optimistic_spin_queue { diff --git a/kernel/locking/osq_lock.c b/kernel/locking/osq_lock.c index 1de006ed3aa8..4fa8f3b9e2a1 100644 --- a/kernel/locking/osq_lock.c +++ b/kernel/locking/osq_lock.c @@ -96,7 +96,13 @@ bool osq_lock(struct optimistic_spin_queue *lock) node->locked = 0; node->next = NULL; - node->cpu = curr; + /* + * After this cpu member is initialized for the first time, it + * would no longer change in fact. That could avoid cache misses + * when spin and access the cpu member by other CPUs. + */ + if (node->cpu != curr) + node->cpu = curr; /* * We need both ACQUIRE (pairs with corresponding RELEASE in -- 2.25.1

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[PATCH OLK-5.10 0/7] cpumask: cleanup nr_cpu_ids vs nr_cpumask_bits mess
by Lu Jialin 13 Dec '23

13 Dec '23

From: Zheng Zucheng <zhengzucheng(a)huawei.com> cpumask subsystem uses nr_cpu_ids and nr_cpumask_bits interchangeably despite that the variables have different meaning and purpose. It makes some cpumask functions broken. This series cleans that mess and adds new config FORCE_NR_CPUS that allows to optimize cpumask subsystem if the number of CPUs is known at compile-time. After some testing I found build broken when SMP is on and NR_CPUS == 1. This is addressed in a new patch #1, and in the following patch #2 that now declares set_nr_cpu_ids in cpumask.h (was in smp.h). Yury Norov (6): smp: don't declare nr_cpu_ids if NR_CPUS == 1 smp: add set_nr_cpu_ids() lib/cpumask: delete misleading comment lib/cpumask: deprecate nr_cpumask_bits lib/cpumask: add FORCE_NR_CPUS config option powerpc/64: don't refer nr_cpu_ids in asm code when it's undefined Zheng Zucheng (1): config: Add FORCE_NR_CPUS to openeuler_defconfig arch/arm64/configs/openeuler_defconfig | 1 + arch/loongarch/kernel/setup.c | 2 +- arch/mips/kernel/setup.c | 2 +- arch/powerpc/kernel/head_64.S | 4 ++++ arch/x86/configs/openeuler_defconfig | 1 + arch/x86/kernel/smpboot.c | 4 ++-- arch/x86/xen/smp_pv.c | 2 +- include/linux/cpumask.h | 22 +++++++++++----------- kernel/smp.c | 6 ++++-- lib/Kconfig | 9 +++++++++ 10 files changed, 35 insertions(+), 18 deletions(-) -- 2.34.1

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[PATCH OLK-6.6] x86/ioapic: add an interface for driver to sync hardware data into memory
by Lin Yujun 13 Dec '23

13 Dec '23

From: Hongbo Yao <yaohongbo(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8NV1E -------------------------------- The default interrupt trigger mode of Pci driver is Level, however, some pci drivers want to change irq trigger mode to edge by writing hardware register directly. In current kernel, this kind of driver needs to sync entry data which has already been reservd in memory. This patch provides an interface for the driver to sync entry data in memory. Signed-off-by: Hongbo Yao <yaohongbo(a)huawei.com> Signed-off-by: Lin Yujun <linyujun809(a)huawei.com> --- arch/x86/include/asm/io_apic.h | 1 + arch/x86/kernel/apic/io_apic.c | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h index 51c782600e02..435ae723a238 100644 --- a/arch/x86/include/asm/io_apic.h +++ b/arch/x86/include/asm/io_apic.h @@ -174,6 +174,7 @@ extern void clear_IO_APIC(void); extern void restore_boot_irq_mode(void); extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin); extern void print_IO_APICs(void); +extern void ioapic_sync_hardware_data(int irq); #else /* !CONFIG_X86_IO_APIC */ #define IO_APIC_IRQ(x) 0 diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 00da6cf6b07d..d256e0b57e94 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -1202,6 +1202,31 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin) } EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector); +/* + * The function is only provided for Drivers to keep the data value in + * memory consistent with the value of the register, and these drivers + * must use it carefully. + * + * The correct step should be: + * Change register ---> ioapic_sync_hardware_data ---> request_irq + */ +void ioapic_sync_hardware_data(int irq) +{ + struct IO_APIC_route_entry entry; + struct mp_chip_data *data; + struct irq_pin_list *pin_list; + + data = irq_get_chip_data(irq); + for_each_irq_pin(pin_list, data->irq_2_pin) { + entry = ioapic_read_entry(pin_list->apic, pin_list->pin); + data->entry.trigger = entry.trigger; + data->entry.polarity = entry.polarity; + pr_debug("irq[%d] update trigger[%d] polarity[%d]\n", + irq, entry.trigger, entry.polarity); + } +} +EXPORT_SYMBOL(ioapic_sync_hardware_data); + static struct irq_chip ioapic_chip, ioapic_ir_chip; static void __init setup_IO_APIC_irqs(void) -- 2.34.1

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