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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@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: https://lkml.kernel.org/r/20211004105706.3669-3-bharata@amd.com
This commit is contained in:
Bharata B Rao 2021-10-04 16:27:04 +05:30 committed by Peter Zijlstra
parent 7a2341fc1f
commit 5b763a14a5
1 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/sched/fair.c
View File

@ -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];