The following commit has been merged into the sched/core branch of tip: Commit-ID: 00c034108a76e8282809b7f25fa6ff147a9c6893 Gitweb: https://git.kernel.org/tip/00c034108a76e8282809b7f25fa6ff147a9c6893 Author: Bharata B Rao <bharata@xxxxxxx> AuthorDate: Mon, 04 Oct 2021 16:27:04 +05:30 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Thu, 07 Oct 2021 13:51:16 +02:00 sched/numa: Remove the redundant member numa_group::fault_cpus numa_group::fault_cpus is actually a pointer to the region in numa_group::faults[] where NUMA_CPU stats are located. Remove this redundant member and use numa_group::faults[NUMA_CPU] directly like it is done for similar per-process numa fault stats. There is no functionality change due to this commit. Signed-off-by: Bharata B Rao <bharata@xxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxx> Link: https://lkml.kernel.org/r/20211004105706.3669-3-bharata@xxxxxxx --- kernel/sched/fair.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index fc0a0ed..cfbd5ef 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1038,11 +1038,12 @@ struct numa_group { unsigned long total_faults; unsigned long max_faults_cpu; /* + * faults[] array is split into two regions: faults_mem and faults_cpu. + * * Faults_cpu is used to decide whether memory should move * towards the CPU. As a consequence, these stats are weighted * more by CPU use than by memory faults. */ - unsigned long *faults_cpu; unsigned long faults[]; }; @@ -1216,8 +1217,8 @@ static inline unsigned long group_faults(struct task_struct *p, int nid) static inline unsigned long group_faults_cpu(struct numa_group *group, int nid) { - return group->faults_cpu[task_faults_idx(NUMA_MEM, nid, 0)] + - group->faults_cpu[task_faults_idx(NUMA_MEM, nid, 1)]; + return group->faults[task_faults_idx(NUMA_CPU, nid, 0)] + + group->faults[task_faults_idx(NUMA_CPU, nid, 1)]; } static inline unsigned long group_faults_priv(struct numa_group *ng) @@ -2384,7 +2385,7 @@ static void task_numa_placement(struct task_struct *p) * is at the beginning of the numa_faults array. */ ng->faults[mem_idx] += diff; - ng->faults_cpu[mem_idx] += f_diff; + ng->faults[cpu_idx] += f_diff; ng->total_faults += diff; group_faults += ng->faults[mem_idx]; } @@ -2450,9 +2451,6 @@ static void task_numa_group(struct task_struct *p, int cpupid, int flags, grp->max_faults_cpu = 0; spin_lock_init(&grp->lock); grp->gid = p->pid; - /* Second half of the array tracks nids where faults happen */ - grp->faults_cpu = grp->faults + NR_NUMA_HINT_FAULT_TYPES * - nr_node_ids; for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++) grp->faults[i] = p->numa_faults[i];
![]() |