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[PATCH OLK-6.6] sched/fair: Remove spurious shorter slice preemption
by Chen Jinghuang 11 Nov '26

11 Nov '26

From: Vincent Guittot <vincent.guittot(a)linaro.org> mainline inclusion from mainline-v6.17-rc1 commit 9de74a9850b9468ac2f515bfbe0844e0bfae869d category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8903 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Even if the waking task can preempt current, it might not be the one selected by pick_task_fair. Check that the waking task will be selected if we cancel the slice protection before doing so. Signed-off-by: Vincent Guittot <vincent.guittot(a)linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Link: https://lkml.kernel.org/r/20250708165630.1948751-4-vincent.guittot@linaro.o… Conflicts: kernel/sched/fair.c [Fixes: 71db1ca0d0e6 ("sched/fair: Separate se->vlag from se->vprot"), this commit broke the RUN_TO_PARITY_WAKEUP feature, causing throughput degradation in high-concurrency scenarios; this patch restores the expected behavior.] Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 43 +++++++++++-------------------------------- 1 file changed, 11 insertions(+), 32 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 69176c7134bb..9b2bfa623a49 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1250,7 +1250,7 @@ static inline void cancel_protect_slice(struct sched_entity *se) * * Which allows tree pruning through eligibility. */ -static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preempt) +static struct sched_entity *__pick_eevdf(struct cfs_rq *cfs_rq, bool protect) { struct rb_node *node = cfs_rq->tasks_timeline.rb_root.rb_node; struct sched_entity *se = __pick_first_entity(cfs_rq); @@ -1279,11 +1279,11 @@ static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preemp * elapsed. */ if (curr && - !(sched_feat(RUN_TO_PARITY_WAKEUP) && wakeup_preempt && curr->vlag == curr->deadline) && + !(sched_feat(RUN_TO_PARITY_WAKEUP) && protect && protect_slice(curr)) && !entity_eligible(cfs_rq, curr)) curr = NULL; - if (curr && protect_slice(curr)) + if (curr && protect && protect_slice(curr)) return curr; /* Pick the leftmost entity if it's eligible */ @@ -1527,27 +1527,6 @@ static inline bool resched_next_slice(struct cfs_rq *cfs_rq, struct sched_entity return !entity_eligible(cfs_rq, curr); } -static inline bool do_preempt_short(struct cfs_rq *cfs_rq, - struct sched_entity *pse, struct sched_entity *se) -{ - if (!sched_feat(PREEMPT_SHORT)) - return false; - - if (pse->slice >= se->slice) - return false; - - if (!entity_eligible(cfs_rq, pse)) - return false; - - if (entity_before(pse, se)) - return true; - - if (!entity_eligible(cfs_rq, se)) - return true; - - return false; -} - /* * Used by other classes to account runtime. */ @@ -5930,7 +5909,7 @@ pick_next_entity(struct cfs_rq *cfs_rq) cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next)) return cfs_rq->next; - return pick_eevdf(cfs_rq, false); + return __pick_eevdf(cfs_rq, false); } static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq); @@ -9861,6 +9840,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int struct cfs_rq *cfs_rq = task_cfs_rq(curr); int next_buddy_marked = 0; int cse_is_idle, pse_is_idle; + bool do_preempt_short = false; bool ret = 0; if (unlikely(se == pse)) @@ -9916,7 +9896,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int * When non-idle entity preempt an idle entity, * don't give idle entity slice protection. */ - cancel_protect_slice(se); + do_preempt_short = true; goto preempt; } @@ -9939,22 +9919,21 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int /* * If @p has a shorter slice than current and @p is eligible, override * current's slice protection in order to allow preemption. - * - * Note that even if @p does not turn out to be the most eligible - * task at this moment, current's slice protection will be lost. */ - if (do_preempt_short(cfs_rq, pse, se)) - cancel_protect_slice(se); + do_preempt_short = sched_feat(PREEMPT_SHORT) && (pse->slice < se->slice); /* * If @p has become the most eligible task, force preemption. */ - if (pick_eevdf(cfs_rq, true) == pse) + if (__pick_eevdf(cfs_rq, !do_preempt_short) == pse) goto preempt; return; preempt: + if (do_preempt_short) + cancel_protect_slice(se); + resched_curr(rq); } -- 2.34.1

2 1

[PATCH OLK-6.6] tracing: Fix NULL dereference when copying keys for a field variable
by Tengda Wu 11 Nov '26

11 Nov '26

From: Donggeun Yoo <donggeunyoo.kernel(a)gmail.com> mainline inclusion from mainline-v7.3 commit a0777b9e53157f1f6848a0fd0650f5465391ea81 category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/10312 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- In event_hist_trigger_parse() where it needs to create actions like "onmatch", it calls: event_hist_trigger_parse() { create_actions() { action_create() { trace_action_create() { trace_action_create_field_var() { create_field_var_hist() Where create_field_var_hist() does a loop on the hist_data representing the keys. The issue is, if the keys uses one of the pseudo field types (like common_cpu), the hist_data field element will have NULL for its field member causing a NULL pointer dereference when accessing the key_field->field->name. # echo 'hist:keys=common_cpu:ts0=common_timestamp.usecs' > \ events/sched/sched_waking/trigger # echo 'my_synth u64 lat; int prio' > synthetic_events # echo 'hist:keys=common_cpu:wakeup_lat=common_timestamp.usecs-$ts0:\ onmatch(sched.sched_waking).my_synth($wakeup_lat,prio)' > \ events/sched/sched_switch/trigger KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:create_field_var_hist+0x771/0x1380 Call Trace: trace_action_create_field_var+0x360/0x600 trace_action_create+0x393/0xe80 event_hist_trigger_parse+0x3e47/0x69e0 trigger_process_regex+0x1a6/0x250 event_trigger_write+0xce/0x160 Instead of accessing it directly, use the proper handler expr_field_str() to get the name. The three previous patches are prerequisites: without them a .buckets key and a common_stacktrace key each render into a command that cannot be parsed back. Cc: stable(a)vger.kernel.org Link: https://patch.msgid.link/20260914053443.981201-5-donggeunyoo.kernel@gmail.c… Fixes: 02205a6752f2 ("tracing: Add support for 'field variables'") Signed-off-by: Donggeun Yoo <donggeunyoo.kernel(a)gmail.com> Assisted-by: Claude:claude-fable-5 Signed-off-by: Steven Rostedt <rostedt(a)goodmis.org> Signed-off-by: Tengda Wu <wutengda2(a)huawei.com> --- kernel/trace/trace_events_hist.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 9af96b7aef67..6f5ec6ff4663 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -3053,7 +3053,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data, key_field = hist_data->fields[i]; if (!first) seq_buf_putc(&s, ','); - seq_buf_puts(&s, key_field->field->name); + expr_field_str(key_field, &s); first = false; } -- 2.34.1

2 1

[PATCH OLK-6.6] sched/fair: Remove spurious shorter slice preemption
by Chen Jinghuang 11 Nov '26

11 Nov '26

From: Vincent Guittot <vincent.guittot(a)linaro.org> mainline inclusion from mainline-v6.17-rc1 commit 9de74a9850b9468ac2f515bfbe0844e0bfae869d category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8903 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Even if the waking task can preempt current, it might not be the one selected by pick_task_fair. Check that the waking task will be selected if we cancel the slice protection before doing so. Signed-off-by: Vincent Guittot <vincent.guittot(a)linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Link: https://lkml.kernel.org/r/20250708165630.1948751-4-vincent.guittot@linaro.o… Conflicts: kernel/sched/fair.c [The previous commit 71db1ca0d0e6 ("sched/fair: Separate se->vlag from se->vprot") broke the RUN_TO_PARITY_WAKEUP feature, causing throughput degradation in high-concurrency scenarios; this patch restores the expected behavior.] Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 43 +++++++++++-------------------------------- 1 file changed, 11 insertions(+), 32 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 69176c7134bb..9b2bfa623a49 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1250,7 +1250,7 @@ static inline void cancel_protect_slice(struct sched_entity *se) * * Which allows tree pruning through eligibility. */ -static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preempt) +static struct sched_entity *__pick_eevdf(struct cfs_rq *cfs_rq, bool protect) { struct rb_node *node = cfs_rq->tasks_timeline.rb_root.rb_node; struct sched_entity *se = __pick_first_entity(cfs_rq); @@ -1279,11 +1279,11 @@ static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preemp * elapsed. */ if (curr && - !(sched_feat(RUN_TO_PARITY_WAKEUP) && wakeup_preempt && curr->vlag == curr->deadline) && + !(sched_feat(RUN_TO_PARITY_WAKEUP) && protect && protect_slice(curr)) && !entity_eligible(cfs_rq, curr)) curr = NULL; - if (curr && protect_slice(curr)) + if (curr && protect && protect_slice(curr)) return curr; /* Pick the leftmost entity if it's eligible */ @@ -1527,27 +1527,6 @@ static inline bool resched_next_slice(struct cfs_rq *cfs_rq, struct sched_entity return !entity_eligible(cfs_rq, curr); } -static inline bool do_preempt_short(struct cfs_rq *cfs_rq, - struct sched_entity *pse, struct sched_entity *se) -{ - if (!sched_feat(PREEMPT_SHORT)) - return false; - - if (pse->slice >= se->slice) - return false; - - if (!entity_eligible(cfs_rq, pse)) - return false; - - if (entity_before(pse, se)) - return true; - - if (!entity_eligible(cfs_rq, se)) - return true; - - return false; -} - /* * Used by other classes to account runtime. */ @@ -5930,7 +5909,7 @@ pick_next_entity(struct cfs_rq *cfs_rq) cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next)) return cfs_rq->next; - return pick_eevdf(cfs_rq, false); + return __pick_eevdf(cfs_rq, false); } static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq); @@ -9861,6 +9840,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int struct cfs_rq *cfs_rq = task_cfs_rq(curr); int next_buddy_marked = 0; int cse_is_idle, pse_is_idle; + bool do_preempt_short = false; bool ret = 0; if (unlikely(se == pse)) @@ -9916,7 +9896,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int * When non-idle entity preempt an idle entity, * don't give idle entity slice protection. */ - cancel_protect_slice(se); + do_preempt_short = true; goto preempt; } @@ -9939,22 +9919,21 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int /* * If @p has a shorter slice than current and @p is eligible, override * current's slice protection in order to allow preemption. - * - * Note that even if @p does not turn out to be the most eligible - * task at this moment, current's slice protection will be lost. */ - if (do_preempt_short(cfs_rq, pse, se)) - cancel_protect_slice(se); + do_preempt_short = sched_feat(PREEMPT_SHORT) && (pse->slice < se->slice); /* * If @p has become the most eligible task, force preemption. */ - if (pick_eevdf(cfs_rq, true) == pse) + if (__pick_eevdf(cfs_rq, !do_preempt_short) == pse) goto preempt; return; preempt: + if (do_preempt_short) + cancel_protect_slice(se); + resched_curr(rq); } -- 2.34.1

2 1

[PATCH OLK-6.6 0/7] P2PDMA PATCHSET PART 2
by Zizhi Wo 11 Nov '26

11 Nov '26

Add some p2pdma api and dedup of vmemmap. hotforest (7): PCI/P2PDMA: whitelist HiSilicon root ports PCI/P2PDMA: disable CPU access through bvec iterators mm: allow compound zone device pages mm: add P2PDMA vmemmap optimization capability PCI/P2PDMA: add aligned resource registration x86: enable P2PDMA vmemmap optimization arm64: enable P2PDMA vmemmap optimization arch/arm64/Kconfig | 1 + arch/x86/Kconfig | 1 + drivers/pci/p2pdma.c | 115 +++++++++++++++++++++++++++++++------ include/linux/memremap.h | 6 +- include/linux/mm.h | 7 ++- include/linux/mmzone.h | 13 ++++- include/linux/pci-p2pdma.h | 21 ++++++- lib/iov_iter.c | 36 ++++++++++-- mm/Kconfig | 7 ++- mm/memremap.c | 2 +- 10 files changed, 176 insertions(+), 33 deletions(-) -- 2.52.0

2 8

[PATCH OLK-6.6] sched/fair: Remove spurious shorter slice preemption
by Chen Jinghuang 11 Nov '26

11 Nov '26

From: Vincent Guittot <vincent.guittot(a)linaro.org> mainline inclusion from mainline-v6.17-rc1 commit 9de74a9850b9468ac2f515bfbe0844e0bfae869d category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8903 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Even if the waking task can preempt current, it might not be the one selected by pick_task_fair. Check that the waking task will be selected if we cancel the slice protection before doing so. Signed-off-by: Vincent Guittot <vincent.guittot(a)linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Link: https://lkml.kernel.org/r/20250708165630.1948751-4-vincent.guittot@linaro.o… Conflicts: kernel/sched/fair.c [a trival context conflict] Signed-off-by: Zhang Qiao <zhangqiao22(a)huawei.com> Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 43 +++++++++++-------------------------------- 1 file changed, 11 insertions(+), 32 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 69176c7134bb..9b2bfa623a49 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1250,7 +1250,7 @@ static inline void cancel_protect_slice(struct sched_entity *se) * * Which allows tree pruning through eligibility. */ -static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preempt) +static struct sched_entity *__pick_eevdf(struct cfs_rq *cfs_rq, bool protect) { struct rb_node *node = cfs_rq->tasks_timeline.rb_root.rb_node; struct sched_entity *se = __pick_first_entity(cfs_rq); @@ -1279,11 +1279,11 @@ static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preemp * elapsed. */ if (curr && - !(sched_feat(RUN_TO_PARITY_WAKEUP) && wakeup_preempt && curr->vlag == curr->deadline) && + !(sched_feat(RUN_TO_PARITY_WAKEUP) && protect && protect_slice(curr)) && !entity_eligible(cfs_rq, curr)) curr = NULL; - if (curr && protect_slice(curr)) + if (curr && protect && protect_slice(curr)) return curr; /* Pick the leftmost entity if it's eligible */ @@ -1527,27 +1527,6 @@ static inline bool resched_next_slice(struct cfs_rq *cfs_rq, struct sched_entity return !entity_eligible(cfs_rq, curr); } -static inline bool do_preempt_short(struct cfs_rq *cfs_rq, - struct sched_entity *pse, struct sched_entity *se) -{ - if (!sched_feat(PREEMPT_SHORT)) - return false; - - if (pse->slice >= se->slice) - return false; - - if (!entity_eligible(cfs_rq, pse)) - return false; - - if (entity_before(pse, se)) - return true; - - if (!entity_eligible(cfs_rq, se)) - return true; - - return false; -} - /* * Used by other classes to account runtime. */ @@ -5930,7 +5909,7 @@ pick_next_entity(struct cfs_rq *cfs_rq) cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next)) return cfs_rq->next; - return pick_eevdf(cfs_rq, false); + return __pick_eevdf(cfs_rq, false); } static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq); @@ -9861,6 +9840,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int struct cfs_rq *cfs_rq = task_cfs_rq(curr); int next_buddy_marked = 0; int cse_is_idle, pse_is_idle; + bool do_preempt_short = false; bool ret = 0; if (unlikely(se == pse)) @@ -9916,7 +9896,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int * When non-idle entity preempt an idle entity, * don't give idle entity slice protection. */ - cancel_protect_slice(se); + do_preempt_short = true; goto preempt; } @@ -9939,22 +9919,21 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int /* * If @p has a shorter slice than current and @p is eligible, override * current's slice protection in order to allow preemption. - * - * Note that even if @p does not turn out to be the most eligible - * task at this moment, current's slice protection will be lost. */ - if (do_preempt_short(cfs_rq, pse, se)) - cancel_protect_slice(se); + do_preempt_short = sched_feat(PREEMPT_SHORT) && (pse->slice < se->slice); /* * If @p has become the most eligible task, force preemption. */ - if (pick_eevdf(cfs_rq, true) == pse) + if (__pick_eevdf(cfs_rq, !do_preempt_short) == pse) goto preempt; return; preempt: + if (do_preempt_short) + cancel_protect_slice(se); + resched_curr(rq); } -- 2.34.1

2 1

[PATCH OLK-6.6] sched/fair: Remove spurious shorter slice preemption
by Chen Jinghuang 11 Nov '26

11 Nov '26

From: Vincent Guittot <vincent.guittot(a)linaro.org> mainline inclusion from mainline-v6.17-rc1 commit 9de74a9850b9468ac2f515bfbe0844e0bfae869d category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8903 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Even if the waking task can preempt current, it might not be the one selected by pick_task_fair. Check that the waking task will be selected if we cancel the slice protection before doing so. Signed-off-by: Vincent Guittot <vincent.guittot(a)linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Link: https://lkml.kernel.org/r/20250708165630.1948751-4-vincent.guittot@linaro.o… Conflicts: kernel/sched/fair.c [a trival context conflict] Signed-off-by: Zhang Qiao <zhangqiao22(a)huawei.com> Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> --- kernel/sched/fair.c | 43 +++++++++++-------------------------------- 1 file changed, 11 insertions(+), 32 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 69176c7134bb..9b2bfa623a49 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1250,7 +1250,7 @@ static inline void cancel_protect_slice(struct sched_entity *se) * * Which allows tree pruning through eligibility. */ -static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preempt) +static struct sched_entity *__pick_eevdf(struct cfs_rq *cfs_rq, bool protect) { struct rb_node *node = cfs_rq->tasks_timeline.rb_root.rb_node; struct sched_entity *se = __pick_first_entity(cfs_rq); @@ -1279,11 +1279,11 @@ static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq, bool wakeup_preemp * elapsed. */ if (curr && - !(sched_feat(RUN_TO_PARITY_WAKEUP) && wakeup_preempt && curr->vlag == curr->deadline) && + !(sched_feat(RUN_TO_PARITY_WAKEUP) && protect && protect_slice(curr)) && !entity_eligible(cfs_rq, curr)) curr = NULL; - if (curr && protect_slice(curr)) + if (curr && protect && protect_slice(curr)) return curr; /* Pick the leftmost entity if it's eligible */ @@ -1527,27 +1527,6 @@ static inline bool resched_next_slice(struct cfs_rq *cfs_rq, struct sched_entity return !entity_eligible(cfs_rq, curr); } -static inline bool do_preempt_short(struct cfs_rq *cfs_rq, - struct sched_entity *pse, struct sched_entity *se) -{ - if (!sched_feat(PREEMPT_SHORT)) - return false; - - if (pse->slice >= se->slice) - return false; - - if (!entity_eligible(cfs_rq, pse)) - return false; - - if (entity_before(pse, se)) - return true; - - if (!entity_eligible(cfs_rq, se)) - return true; - - return false; -} - /* * Used by other classes to account runtime. */ @@ -5930,7 +5909,7 @@ pick_next_entity(struct cfs_rq *cfs_rq) cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next)) return cfs_rq->next; - return pick_eevdf(cfs_rq, false); + return __pick_eevdf(cfs_rq, false); } static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq); @@ -9861,6 +9840,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int struct cfs_rq *cfs_rq = task_cfs_rq(curr); int next_buddy_marked = 0; int cse_is_idle, pse_is_idle; + bool do_preempt_short = false; bool ret = 0; if (unlikely(se == pse)) @@ -9916,7 +9896,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int * When non-idle entity preempt an idle entity, * don't give idle entity slice protection. */ - cancel_protect_slice(se); + do_preempt_short = true; goto preempt; } @@ -9939,22 +9919,21 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int /* * If @p has a shorter slice than current and @p is eligible, override * current's slice protection in order to allow preemption. - * - * Note that even if @p does not turn out to be the most eligible - * task at this moment, current's slice protection will be lost. */ - if (do_preempt_short(cfs_rq, pse, se)) - cancel_protect_slice(se); + do_preempt_short = sched_feat(PREEMPT_SHORT) && (pse->slice < se->slice); /* * If @p has become the most eligible task, force preemption. */ - if (pick_eevdf(cfs_rq, true) == pse) + if (__pick_eevdf(cfs_rq, !do_preempt_short) == pse) goto preempt; return; preempt: + if (do_preempt_short) + cancel_protect_slice(se); + resched_curr(rq); } -- 2.34.1

2 5

[PATCH OLK-6.6 V3 0/9] P2PDMA PATCHSET PART 1
by Zizhi Wo 09 Nov '26

09 Nov '26

To support iostat statistics of passthrough and support dm/md/nvme-multipath p2pdma. Bart Van Assche (1): block: Fix queue_iostats_passthrough_show() Chaitanya Kulkarni (1): block: clear BLK_FEAT_PCI_P2PDMA in blk_stack_limits() for non-supporting devices Keith Busch (3): block: enable passthrough command statistics block: export passthrough stats enabled nvme: add support multipath passthrough iostats Kiran Kumar Modukuri (2): md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device nvme-multipath: enable PCI P2PDMA for multipath devices Zizhi Wo (1): block: withhold P2PDMA from integrity-bearing stacks hotforest (1): dm: pass PCI P2PDMA through linear and striped targets Documentation/ABI/stable/sysfs-block | 8 ++++++ block/blk-mq-debugfs.c | 1 + block/blk-settings.c | 7 +++++ block/blk-sysfs.c | 26 ++++++++++++++++++ block/blk.h | 4 ++- drivers/md/dm-linear.c | 3 +- drivers/md/dm-stripe.c | 3 +- drivers/md/dm-table.c | 27 ++++++++++++++++++ drivers/md/raid0.c | 2 ++ drivers/md/raid1.c | 1 + drivers/md/raid10.c | 1 + drivers/nvme/host/core.c | 6 ++++ drivers/nvme/host/ioctl.c | 9 ++++++ drivers/nvme/host/multipath.c | 6 +++- include/linux/blk-mq.h | 41 ++++++++++++++++++++++++++++ include/linux/blkdev.h | 3 ++ include/linux/device-mapper.h | 5 ++++ 17 files changed, 149 insertions(+), 4 deletions(-) -- 2.52.0

2 10

[PATCH OLK-6.6 V2 0/9] P2PDMA PATCHSET PART 1
by Zizhi Wo 09 Nov '26

09 Nov '26

To support iostat statistics of passthrough and support dm/md/nvme-multipath p2pdma. Bart Van Assche (1): block: Fix queue_iostats_passthrough_show() Chaitanya Kulkarni (1): block: clear BLK_FEAT_PCI_P2PDMA in blk_stack_limits() for non-supporting devices Keith Busch (3): block: enable passthrough command statistics block: export passthrough stats enabled nvme: add support multipath passthrough iostats Kiran Kumar Modukuri (2): md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device nvme-multipath: enable PCI P2PDMA for multipath devices Zizhi Wo (1): block: withhold P2PDMA from integrity-bearing stacks hotforest (1): dm: pass PCI P2PDMA through linear and striped targets Documentation/ABI/stable/sysfs-block | 8 ++++++ block/blk-mq-debugfs.c | 1 + block/blk-settings.c | 20 ++++++++++++++ block/blk-sysfs.c | 26 ++++++++++++++++++ block/blk.h | 4 ++- drivers/md/dm-linear.c | 3 +- drivers/md/dm-stripe.c | 3 +- drivers/md/dm-table.c | 27 ++++++++++++++++++ drivers/md/raid0.c | 2 ++ drivers/md/raid1.c | 1 + drivers/md/raid10.c | 1 + drivers/nvme/host/core.c | 6 ++++ drivers/nvme/host/ioctl.c | 9 ++++++ drivers/nvme/host/multipath.c | 6 +++- include/linux/blk-mq.h | 41 ++++++++++++++++++++++++++++ include/linux/blkdev.h | 3 ++ include/linux/device-mapper.h | 5 ++++ 17 files changed, 162 insertions(+), 4 deletions(-) -- 2.52.0

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[PATCH OLK-5.10 0/2] checkpatch.pl: minor improvements
by Tengda Wu 09 Nov '26

09 Nov '26

checkpatch.pl: minor improvements. Jeff Layton (1): checkpatch.pl: adapt to new Assisted-by: format Tengda Wu (1): checkpatch: recognize Co-authored-by as a valid signature tag scripts/checkpatch.pl | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) -- 2.34.1

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[PATCH OLK-6.6 0/2] checkpatch.pl: minor improvements
by Tengda Wu 09 Nov '26

09 Nov '26

checkpatch.pl: minor improvements Jeff Layton (1): checkpatch.pl: adapt to new Assisted-by: format Tengda Wu (1): checkpatch: recognize Co-authored-by as a valid signature tag scripts/checkpatch.pl | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) -- 2.34.1

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