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[PATCH OLK-6.6] sched/fair: Prefer steal within LLC and fallback to upper LLC newidle_balance on failure
by Chen Jinghuang 28 Feb '26

28 Feb '26

hulk inclusion category: perf bugzilla: https://atomgit.com/openeuler/kernel/issues/8555 -------------------------------- Implement fast load balancing with steal-task mechanism within the LLC domain; if task pulling fails, fall back to the native newidle_balance mechanism on LLC and upper scheduling domains. This optimization prioritizes task scheduling within the LLC domain to improve cache hit rate, while mitigating system load imbalance issues. Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 21 +++++++++++++++++++-- kernel/sched/features.h | 1 + 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e60f19cb0fee..a4592d35da8b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5236,6 +5236,11 @@ static inline bool steal_enabled(void) return sched_feat(STEAL) && allow; } +static inline bool steal_fail_ni_enabled(void) +{ + return sched_feat(STEAL_FAIL_NI); +} + static void overload_clear(struct rq *rq) { struct sparsemask *overload_cpus; @@ -5275,6 +5280,7 @@ static int try_steal(struct rq *this_rq, struct rq_flags *rf); static inline int try_steal(struct rq *this_rq, struct rq_flags *rf) { return 0; } static inline void overload_clear(struct rq *rq) {} static inline void overload_set(struct rq *rq) {} +static inline bool steal_fail_ni_enabled(void) { return false; } #endif #else /* CONFIG_SMP */ @@ -10343,9 +10349,15 @@ done: __maybe_unused; */ rq_idle_stamp_update(rq); - new_tasks = newidle_balance(rq, rf); - if (new_tasks == 0) + if (steal_fail_ni_enabled()) { new_tasks = try_steal(rq, rf); + if (new_tasks == 0) + new_tasks = newidle_balance(rq, rf); + } else { + new_tasks = newidle_balance(rq, rf); + if (new_tasks == 0) + new_tasks = try_steal(rq, rf); + } schedstat_end_time(rq, time); if (new_tasks) @@ -14313,6 +14325,11 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf) int continue_balancing = 1; u64 domain_cost; + if (steal_fail_ni_enabled()) { + if (sd->flags & SD_SHARE_PKG_RESOURCES) + continue; + } + update_next_balance(sd, &next_balance); if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 1f665fbf0137..52ea0097c513 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,6 +63,7 @@ SCHED_FEAT(SIS_UTIL, true) * Improves CPU utilization. */ SCHED_FEAT(STEAL, false) +SCHED_FEAT(STEAL_FAIL_NI, false) #endif #ifdef CONFIG_SCHED_PARAL -- 2.33.0

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[PATCH v8 0/5] arm64/riscv: Add support for crashkernel CMA reservation
by Jinjie Ruan 28 Feb '26

28 Feb '26

The crash memory allocation, and the exclude of crashk_res, crashk_low_res and crashk_cma memory are almost identical across different architectures, This patch set handle them in crash core in a general way, which eliminate a lot of duplication code. And add support for crashkernel CMA reservation for arm64 and riscv. Rebased on v7.0-rc1. Basic second kernel boot test were performed on QEMU platforms for x86, ARM64, and RISC-V architectures with the following parameters: "cma=256M crashkernel=256M crashkernel=64M,cma" Changes in v8: - Fix the build issues reported by kernel test robot and Sourabh. - Link to v7: https://lore.kernel.org/all/20260226130437.1867658-1-ruanjinjie@huawei.com/ Changes in v7: - Correct the inclusion of CMA-reserved ranges for kdump kernel in of/kexec for arm64 and riscv. - Add Acked-by. - Link to v6: https://lore.kernel.org/all/20260224085342.387996-1-ruanjinjie@huawei.com/ Changes in v6: - Update the crash core exclude code as Mike suggested. - Rebased on v7.0-rc1. - Add acked-by. - Link to v5: https://lore.kernel.org/all/20260212101001.343158-1-ruanjinjie@huawei.com/ Changes in v5: - Fix the kernel test robot build warnings. - Sort crash memory ranges before preparing elfcorehdr for powerpc - Link to v4: https://lore.kernel.org/all/20260209095931.2813152-1-ruanjinjie@huawei.com/ Changes in v4: - Move the size calculation (and the realloc if needed) into the generic crash. - Link to v3: https://lore.kernel.org/all/20260204093728.1447527-1-ruanjinjie@huawei.com/ Jinjie Ruan (4): crash: Exclude crash kernel memory in crash core crash: Use crash_exclude_core_ranges() on powerpc arm64: kexec: Add support for crashkernel CMA reservation riscv: kexec: Add support for crashkernel CMA reservation Sourabh Jain (1): powerpc/crash: sort crash memory ranges before preparing elfcorehdr .../admin-guide/kernel-parameters.txt | 16 +-- arch/arm64/kernel/machine_kexec_file.c | 39 +++---- arch/arm64/mm/init.c | 5 +- arch/loongarch/kernel/machine_kexec_file.c | 39 +++---- arch/powerpc/include/asm/kexec_ranges.h | 1 - arch/powerpc/kexec/crash.c | 5 +- arch/powerpc/kexec/ranges.c | 101 +----------------- arch/riscv/kernel/machine_kexec_file.c | 38 +++---- arch/riscv/mm/init.c | 5 +- arch/x86/kernel/crash.c | 89 +++------------ drivers/of/fdt.c | 9 +- drivers/of/kexec.c | 9 ++ include/linux/crash_core.h | 9 ++ kernel/crash_core.c | 89 ++++++++++++++- 14 files changed, 178 insertions(+), 276 deletions(-) -- 2.34.1

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[PATCH OLK-6.6] sched/fair: Prefer steal within LLC and fallback to newidle_balance
by Chen Jinghuang 28 Feb '26

28 Feb '26

hulk inclusion category: perf bugzilla: https://atomgit.com/openeuler/kernel/issues/8555 -------------------------------- Implement fast load balancing with steal-task mechanism within the LLC domain; if task pulling fails, fall back to the native newidle_balance mechanism on LLC and upper scheduling domains. This optimization prioritizes task scheduling within the LLC domain to improve cache hit rate, while mitigating system load imbalance issues. Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 15 +++++++++++++-- kernel/sched/features.h | 1 + 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e60f19cb0fee..fd37f7648c86 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10343,9 +10343,15 @@ done: __maybe_unused; */ rq_idle_stamp_update(rq); - new_tasks = newidle_balance(rq, rf); - if (new_tasks == 0) + if (sched_feat(STEAL_FAIL_NI)) { new_tasks = try_steal(rq, rf); + if (new_tasks == 0) + new_tasks = newidle_balance(rq, rf); + } else { + new_tasks = newidle_balance(rq, rf); + if (new_tasks == 0) + new_tasks = try_steal(rq, rf); + } schedstat_end_time(rq, time); if (new_tasks) @@ -14313,6 +14319,11 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf) int continue_balancing = 1; u64 domain_cost; + if (sched_feat(STEAL_FAIL_NI)) { + if (sd->flags & SD_SHARE_PKG_RESOURCES) + continue; + } + update_next_balance(sd, &next_balance); if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 1f665fbf0137..52ea0097c513 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,6 +63,7 @@ SCHED_FEAT(SIS_UTIL, true) * Improves CPU utilization. */ SCHED_FEAT(STEAL, false) +SCHED_FEAT(STEAL_FAIL_NI, false) #endif #ifdef CONFIG_SCHED_PARAL -- 2.34.1

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[PATCH OLK-6.6] sched/fair: Prefer steal within LLC and fallback to newidle_balance
by Chen Jinghuang 28 Feb '26

28 Feb '26

Offering: HULK hulk inclusion category: perf bugzilla: https://atomgit.com/openeuler/kernel/issues/8555 -------------------------------- Implement fast load balancing with steal-task mechanism within the LLC domain; if task pulling fails, fall back to the native newidle_balance mechanism on LLC and upper scheduling domains. This optimization prioritizes task scheduling within the LLC domain to improve cache hit rate, while mitigating system load imbalance issues. Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 15 +++++++++++++-- kernel/sched/features.h | 1 + 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e60f19cb0fee..fd37f7648c86 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10343,9 +10343,15 @@ done: __maybe_unused; */ rq_idle_stamp_update(rq); - new_tasks = newidle_balance(rq, rf); - if (new_tasks == 0) + if (sched_feat(STEAL_FAIL_NI)) { new_tasks = try_steal(rq, rf); + if (new_tasks == 0) + new_tasks = newidle_balance(rq, rf); + } else { + new_tasks = newidle_balance(rq, rf); + if (new_tasks == 0) + new_tasks = try_steal(rq, rf); + } schedstat_end_time(rq, time); if (new_tasks) @@ -14313,6 +14319,11 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf) int continue_balancing = 1; u64 domain_cost; + if (sched_feat(STEAL_FAIL_NI)) { + if (sd->flags & SD_SHARE_PKG_RESOURCES) + continue; + } + update_next_balance(sd, &next_balance); if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 1f665fbf0137..52ea0097c513 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,6 +63,7 @@ SCHED_FEAT(SIS_UTIL, true) * Improves CPU utilization. */ SCHED_FEAT(STEAL, false) +SCHED_FEAT(STEAL_FAIL_NI, false) #endif #ifdef CONFIG_SCHED_PARAL -- 2.34.1

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[PATCH OLK-6.6] [Huawei] sched/fair: Prefer steal within LLC and fallback to newidle_balance
by Chen Jinghuang 28 Feb '26

28 Feb '26

Offering: HULK hulk inclusion category: perf bugzilla: https://atomgit.com/openeuler/kernel/issues/8555 -------------------------------- Implement fast load balancing with steal-task mechanism within the LLC domain; if task pulling fails, fall back to the native newidle_balance mechanism on LLC and upper scheduling domains. This optimization prioritizes task scheduling within the LLC domain to improve cache hit rate, while mitigating system load imbalance issues. Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 15 +++++++++++++-- kernel/sched/features.h | 1 + 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e60f19cb0fee..fd37f7648c86 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10343,9 +10343,15 @@ done: __maybe_unused; */ rq_idle_stamp_update(rq); - new_tasks = newidle_balance(rq, rf); - if (new_tasks == 0) + if (sched_feat(STEAL_FAIL_NI)) { new_tasks = try_steal(rq, rf); + if (new_tasks == 0) + new_tasks = newidle_balance(rq, rf); + } else { + new_tasks = newidle_balance(rq, rf); + if (new_tasks == 0) + new_tasks = try_steal(rq, rf); + } schedstat_end_time(rq, time); if (new_tasks) @@ -14313,6 +14319,11 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf) int continue_balancing = 1; u64 domain_cost; + if (sched_feat(STEAL_FAIL_NI)) { + if (sd->flags & SD_SHARE_PKG_RESOURCES) + continue; + } + update_next_balance(sd, &next_balance); if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 1f665fbf0137..52ea0097c513 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,6 +63,7 @@ SCHED_FEAT(SIS_UTIL, true) * Improves CPU utilization. */ SCHED_FEAT(STEAL, false) +SCHED_FEAT(STEAL_FAIL_NI, false) #endif #ifdef CONFIG_SCHED_PARAL -- 2.34.1

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[PATCH OLK-6.6 0/2] CVE-2026-23163
by Hongtao Zhang 28 Feb '26

28 Feb '26

*** BLURB HERE *** Jon Doron (1): [Backport] drm/amdgpu: fix NULL pointer dereference in amdgpu_gmc_filter_faults_remove Philip Yang (1): [Backport] drm/amdkfd: Don't use sw fault filter if retry cam enabled drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) -- 2.43.0

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[PATCH OLK-6.6] sched/fair: Prefer steal within LLC and fallback to upper LLC newidle_balance on failure
by Chen Jinghuang 27 Feb '26

27 Feb '26

Offering: HULK hulk inclusion category: perf bugzilla: https://atomgit.com/openeuler/kernel/issues/8555 -------------------------------- Implement fast load balancing with steal-task mechanism within the LLC domain; if task pulling fails, fall back to the native newidle_balance mechanism on LLC and upper scheduling domains. This optimization prioritizes task scheduling within the LLC domain to improve cache hit rate, while mitigating system load imbalance issues. Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 21 +++++++++++++++++++-- kernel/sched/features.h | 1 + 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e60f19cb0fee..a4592d35da8b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5236,6 +5236,11 @@ static inline bool steal_enabled(void) return sched_feat(STEAL) && allow; } +static inline bool steal_fail_ni_enabled(void) +{ + return sched_feat(STEAL_FAIL_NI); +} + static void overload_clear(struct rq *rq) { struct sparsemask *overload_cpus; @@ -5275,6 +5280,7 @@ static int try_steal(struct rq *this_rq, struct rq_flags *rf); static inline int try_steal(struct rq *this_rq, struct rq_flags *rf) { return 0; } static inline void overload_clear(struct rq *rq) {} static inline void overload_set(struct rq *rq) {} +static inline bool steal_fail_ni_enabled(void) { return false; } #endif #else /* CONFIG_SMP */ @@ -10343,9 +10349,15 @@ done: __maybe_unused; */ rq_idle_stamp_update(rq); - new_tasks = newidle_balance(rq, rf); - if (new_tasks == 0) + if (steal_fail_ni_enabled()) { new_tasks = try_steal(rq, rf); + if (new_tasks == 0) + new_tasks = newidle_balance(rq, rf); + } else { + new_tasks = newidle_balance(rq, rf); + if (new_tasks == 0) + new_tasks = try_steal(rq, rf); + } schedstat_end_time(rq, time); if (new_tasks) @@ -14313,6 +14325,11 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf) int continue_balancing = 1; u64 domain_cost; + if (steal_fail_ni_enabled()) { + if (sd->flags & SD_SHARE_PKG_RESOURCES) + continue; + } + update_next_balance(sd, &next_balance); if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 1f665fbf0137..52ea0097c513 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,6 +63,7 @@ SCHED_FEAT(SIS_UTIL, true) * Improves CPU utilization. */ SCHED_FEAT(STEAL, false) +SCHED_FEAT(STEAL_FAIL_NI, false) #endif #ifdef CONFIG_SCHED_PARAL -- 2.33.0

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[PATCH openEuler-1.0-LTS v5 0/9] support apei_page_offline_policy
by Qi Xi 27 Feb '26

27 Feb '26

Changes in v5: Change sysctl_apei_page_offline_policy bit0 to enable/disable driver notification. Backport some patches that have been merged. Since CONFIG_UCE_KERNEL_RECOVERY depends on CONFIG_ARM64, remove the redundant condition in migrate_page(). Changes in v4: Fix typo errors and backport bugfix for mc_copy. Changes in v3: Use bool rather than int as the return type of apei_page_should_offline(). Drop the PF_UCE_KERNEL_RECOVERY flag after soft-offlining the page. Changes in v2: Add a new sysctl_apei_page_offline_policy, instead of changing soft_offline_page. Jiaqi Yan (1): mm/memory-failure: userspace controls soft-offlining pages Kyle Meyer (1): mm/memory-failure: support disabling soft offline for HugeTLB pages Qi Xi (3): Revert "mm/memory-failure: support disabling soft offline for HugeTLB pages" Revert "arm64: mm: Add copy mc support for migrate_page" apei/ghes: Add sysctl interface to control soft-offline page isolation Wupeng Ma (3): uce: add copy_mc_highpage{s} arm64: mm: Add copy mc support for migrate_page arm64: mm: Add copy mc support for migrate_page Yongjian Sun (1): ext4: fix e4b bitmap inconsistency reports drivers/acpi/apei/ghes.c | 77 ++++++++++++++++++++++++++++++++++++++++ fs/ext4/mballoc.c | 21 +++++------ include/linux/highmem.h | 55 ++++++++++++++++++++++++++++ include/linux/mm.h | 7 ++++ kernel/sysctl.c | 21 +++++++++++ mm/memory-failure.c | 20 +++++++++-- mm/migrate.c | 58 ++++++++++++++++++++++++++++-- 7 files changed, 244 insertions(+), 15 deletions(-) -- 2.33.0

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[PATCH OLK-6.6] ASoC: amd: fix memory leak in acp3x pdm dma ops
by Zhang Yuwei 27 Feb '26

27 Feb '26

From: Chris Bainbridge <chris.bainbridge(a)gmail.com> mainline inclusion from mainline-v6.19 commit 7f67ba5413f98d93116a756e7f17cd2c1d6c2bd6 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/13747 CVE: CVE-2026-23190 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Fixes: 4a767b1d039a8 ("ASoC: amd: add acp3x pdm driver dma ops") Signed-off-by: Chris Bainbridge <chris.bainbridge(a)gmail.com> Link: https://patch.msgid.link/20260202205034.7697-1-chris.bainbridge@gmail.com Signed-off-by: Mark Brown <broonie(a)kernel.org> Signed-off-by: Zhang Yuwei <zhangyuwei20(a)huawei.com> --- sound/soc/amd/renoir/acp3x-pdm-dma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/soc/amd/renoir/acp3x-pdm-dma.c b/sound/soc/amd/renoir/acp3x-pdm-dma.c index c3b47e9bd239..39223ff37b14 100644 --- a/sound/soc/amd/renoir/acp3x-pdm-dma.c +++ b/sound/soc/amd/renoir/acp3x-pdm-dma.c @@ -301,9 +301,11 @@ static int acp_pdm_dma_close(struct snd_soc_component *component, struct snd_pcm_substream *substream) { struct pdm_dev_data *adata = dev_get_drvdata(component->dev); + struct pdm_stream_instance *rtd = substream->runtime->private_data; disable_pdm_interrupts(adata->acp_base); adata->capture_stream = NULL; + kfree(rtd); return 0; } -- 2.22.0

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[PATCH OLK-6.6] [Huawei] sched/fair: Prefer steal within LLC and fallback to upper LLC newidle_balance on failure
by Chen Jinghuang 27 Feb '26

27 Feb '26

Offering: HULK hulk inclusion category: perf bugzilla: https://atomgit.com/openeuler/kernel/issues/8555 -------------------------------- Implement fast load balancing with steal-task mechanism within the LLC domain; if task pulling fails, fall back to the native newidle_balance mechanism on LLC and upper scheduling domains. This optimization prioritizes task scheduling within the LLC domain to improve cache hit rate, while mitigating system load imbalance issues. Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 15 +++++++++++++-- kernel/sched/features.h | 1 + 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e60f19cb0fee..fd37f7648c86 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10343,9 +10343,15 @@ done: __maybe_unused; */ rq_idle_stamp_update(rq); - new_tasks = newidle_balance(rq, rf); - if (new_tasks == 0) + if (sched_feat(STEAL_FAIL_NI)) { new_tasks = try_steal(rq, rf); + if (new_tasks == 0) + new_tasks = newidle_balance(rq, rf); + } else { + new_tasks = newidle_balance(rq, rf); + if (new_tasks == 0) + new_tasks = try_steal(rq, rf); + } schedstat_end_time(rq, time); if (new_tasks) @@ -14313,6 +14319,11 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf) int continue_balancing = 1; u64 domain_cost; + if (sched_feat(STEAL_FAIL_NI)) { + if (sd->flags & SD_SHARE_PKG_RESOURCES) + continue; + } + update_next_balance(sd, &next_balance); if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 1f665fbf0137..52ea0097c513 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,6 +63,7 @@ SCHED_FEAT(SIS_UTIL, true) * Improves CPU utilization. */ SCHED_FEAT(STEAL, false) +SCHED_FEAT(STEAL_FAIL_NI, false) #endif #ifdef CONFIG_SCHED_PARAL -- 2.34.1

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