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[PATCH OLK-6.6 0/1] Support priority load balance for qos scheduler
by Song Zhang 27 Dec '23

27 Dec '23

Song Zhang (1): sched: Introduce priority load balance for qos scheduler arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + init/Kconfig | 9 +++ kernel/sched/core.c | 3 + kernel/sched/fair.c | 83 +++++++++++++++++++++++++- kernel/sched/sched.h | 3 + 6 files changed, 99 insertions(+), 1 deletion(-) -- 2.33.0

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[PATCH OLK-6.6 0/1] Support priority load balance for qos scheduler
by Song Zhang 27 Dec '23

27 Dec '23

Song Zhang (1): sched: Introduce priority load balance for qos scheduler arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + init/Kconfig | 9 +++ kernel/sched/core.c | 3 + kernel/sched/fair.c | 83 +++++++++++++++++++++++++- kernel/sched/sched.h | 3 + 6 files changed, 99 insertions(+), 1 deletion(-) -- 2.33.0

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[PATCH OLK-6.6 0/1] drm: fix free illegal pointer when create drm_property_blob failed
by zhangnaichuan 27 Dec '23

27 Dec '23

we get (Unable to handle kernel NULL pointer dereference at virtual address 000000000000000c) when call drm_property_blob_put(). After analysis, we get the following process: alloc failed: drm_atomic_set_mode_for_crtc() drm_property_create_blob() // failed state->mode_blob = ERR_PTR(-ENOMEM) free illegal pointer: __drm_atomic_helper_crtc_destroy_state() drm_property_blob_put(state->mode_blob) drm_mode_object_put(&blob->base); // here blob is ERR_PTR(-ENOMEM) So do we have to determine if blob is an error code before calling drm_mode_object_put(). Fixes: 6bcacf51d050 (drm: Add reference counting to blob properties) drivers/gpu/drm/drm_property.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.33.0

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[PATCH OLK-6.6 V1 00/12] sched: basic infrastructure for scheduler bpf
by Guan Jing 27 Dec '23

27 Dec '23

sched: basic infrastructure for scheduler bpf Guan Jing (12): sched: programmable: Introduce bpf sched sched: programmable: Add a tag for the task sched: programmable: Add a tag for the task group sched: programmable: Add user interface of task group tag sched: programmable: Add user interface of task tag sched: basic infrastructure for scheduler bpf sched: introduce bpf_sched_enable() libbpf: add support for scheduler bpf programs bpftool: recognize scheduler programs sched: Add helper functions to get cpu statistics sched: programmable: Add hook in select_task_rq_fair() sched: programmable: Add hook in can_migrate_task() fs/proc/base.c | 64 +++++++++++++++++ include/linux/bpf_sched.h | 50 ++++++++++++++ include/linux/bpf_types.h | 4 ++ include/linux/sched.h | 38 ++++++++++ include/linux/sched_hook_defs.h | 3 + include/uapi/linux/bpf.h | 9 +++ init/init_task.c | 3 + kernel/bpf/Kconfig | 10 +++ kernel/bpf/btf.c | 1 + kernel/bpf/syscall.c | 27 ++++++++ kernel/bpf/trampoline.c | 1 + kernel/bpf/verifier.c | 11 ++- kernel/sched/bpf_sched.c | 102 +++++++++++++++++++++++++++ kernel/sched/build_utility.c | 4 ++ kernel/sched/core.c | 118 ++++++++++++++++++++++++++++++++ kernel/sched/fair.c | 46 +++++++++++++ kernel/sched/sched.h | 10 +++ scripts/bpf_doc.py | 4 ++ tools/include/uapi/linux/bpf.h | 9 +++ tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 23 ++++++- tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 1 + 23 files changed, 539 insertions(+), 2 deletions(-) create mode 100644 include/linux/bpf_sched.h create mode 100644 include/linux/sched_hook_defs.h create mode 100644 kernel/sched/bpf_sched.c -- 2.34.1

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[PATCH v2 OLK-6.6 0/1] x86/kdump: make crash kernel boot faster
by zhangnaichuan 27 Dec '23

27 Dec '23

description: If other cpus offline before handle the crash NMI, the waiting_for_crash_ipi can not be decreased to 0, and current cpu will wait 1 second. So break if all other cpus offline. arch/x86/kernel/reboot.c | 8 ++++++++ 1 file changed, 8 insertions(+) -- 2.33.0

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[PATCH OLK-6.6 0/1] arm64: Add non nmi ipi backtrace support
by Liao Chen 27 Dec '23

27 Dec '23

From: linruizhe <linruizhe(a)huawei.com> Dependencies: CONFIG_DETECT_HUNG_TASK=y CONFIG_WATCHDOG=y Li Zhengyu (1): arm64: Add non nmi ipi backtrace support arch/arm64/kernel/ipi_nmi.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) -- 2.25.1

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[PATCH OLK-6.6 0/1] x86/kdump: add log before booting crash kernel
by zhangnaichuan 27 Dec '23

27 Dec '23

description: Just like arm64, print "Bye!" before booting crash kernel. arch/x86/kernel/machine_kexec_64.c | 2 ++ 1 file changed, 2 insertions(+) -- 2.33.0

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[PATCH OLK-6.6 0/1]
by zhangnaichuan 27 Dec '23

27 Dec '23

description: Just like arm64, print "Bye!" before booting crash kernel. arch/x86/kernel/machine_kexec_64.c | 2 ++ 1 file changed, 2 insertions(+) -- 2.33.0

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[PATCH openEuler-1.0-LTS] jbd2: fix soft lockup in journal_finish_inode_data_buffers()
by Zizhi Wo 27 Dec '23

27 Dec '23

From: Ye Bin <yebin10(a)huawei.com> mainline inclusion from mainline-v6.7-rc6 commit 6c02757c936063f0631b4e43fe156f8c8f1f351f category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8RRXU?from=project-issue CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- There's issue when do io test: WARN: soft lockup - CPU#45 stuck for 11s! [jbd2/dm-2-8:4170] CPU: 45 PID: 4170 Comm: jbd2/dm-2-8 Kdump: loaded Tainted: G OE Call trace: dump_backtrace+0x0/0x1a0 show_stack+0x24/0x30 dump_stack+0xb0/0x100 watchdog_timer_fn+0x254/0x3f8 __hrtimer_run_queues+0x11c/0x380 hrtimer_interrupt+0xfc/0x2f8 arch_timer_handler_phys+0x38/0x58 handle_percpu_devid_irq+0x90/0x248 generic_handle_irq+0x3c/0x58 __handle_domain_irq+0x68/0xc0 gic_handle_irq+0x90/0x320 el1_irq+0xcc/0x180 queued_spin_lock_slowpath+0x1d8/0x320 jbd2_journal_commit_transaction+0x10f4/0x1c78 [jbd2] kjournald2+0xec/0x2f0 [jbd2] kthread+0x134/0x138 ret_from_fork+0x10/0x18 Analyzed informations from vmcore as follows: (1) There are about 5k+ jbd2_inode in 'commit_transaction->t_inode_list'; (2) Now is processing the 855th jbd2_inode; (3) JBD2 task has TIF_NEED_RESCHED flag; (4) There's no pags in address_space around the 855th jbd2_inode; (5) There are some process is doing drop caches; (6) Mounted with 'nodioread_nolock' option; (7) 128 CPUs; According to informations from vmcore we know 'journal->j_list_lock' spin lock competition is fierce. So journal_finish_inode_data_buffers() maybe process slowly. Theoretically, there is scheduling point in the filemap_fdatawait_range_keep_errors(). However, if inode's address_space has no pages which taged with PAGECACHE_TAG_WRITEBACK, will not call cond_resched(). So may lead to soft lockup. journal_finish_inode_data_buffers filemap_fdatawait_range_keep_errors __filemap_fdatawait_range while (index <= end) nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, PAGECACHE_TAG_WRITEBACK); if (!nr_pages) break; --> If 'nr_pages' is equal zero will break, then will not call cond_resched() for (i = 0; i < nr_pages; i++) wait_on_page_writeback(page); cond_resched(); To solve above issue, add scheduling point in the journal_finish_inode_data_buffers(); Signed-off-by: Ye Bin <yebin10(a)huawei.com> Reviewed-by: Jan Kara <jack(a)suse.cz> Link: https://lore.kernel.org/r/20231211112544.3879780-1-yebin10@huawei.com Signed-off-by: Theodore Ts'o <tytso(a)mit.edu> Signed-off-by: Zizhi Wo <wozizhi(a)huawei.com> --- fs/jbd2/commit.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index 8c13c0a030a4..99562835be45 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -274,6 +274,7 @@ static int journal_finish_inode_data_buffers(journal_t *journal, dirty_end); if (!ret) ret = err; + cond_resched(); spin_lock(&journal->j_list_lock); jinode->i_flags &= ~JI_COMMIT_RUNNING; smp_mb(); -- 2.39.2

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[PATCH OLK-6.6 0/1]
by zhangnaichuan 27 Dec '23

27 Dec '23

Just like arm64, print "Bye!" before booting crash kernel. arch/x86/kernel/machine_kexec_64.c | 2 ++ 1 file changed, 2 insertions(+) -- 2.33.0

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