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| author | Mel Gorman <mgorman@techsingularity.net> | 2023-10-10 09:31:40 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-10-10 11:10:00 +0200 |
| commit | ed2da8b725b932b1e2b2f4835bb664d47ed03031 (patch) | |
| tree | 3a93d7fe1e5fa5dd0843e5bbecf59a8ef8eada00 /kernel/sched | |
| parent | f3a6c97940fbd25d6c84c2d5642338fc99a9b35b (diff) | |
| download | linux-stable-ed2da8b725b932b1e2b2f4835bb664d47ed03031.tar.gz linux-stable-ed2da8b725b932b1e2b2f4835bb664d47ed03031.tar.bz2 linux-stable-ed2da8b725b932b1e2b2f4835bb664d47ed03031.zip | |
sched/numa: Trace decisions related to skipping VMAs
NUMA balancing skips or scans VMAs for a variety of reasons. In preparation
for completing scans of VMAs regardless of PID access, trace the reasons
why a VMA was skipped. In a later patch, the tracing will be used to track
if a VMA was forcibly scanned.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231010083143.19593-4-mgorman@techsingularity.net
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6b47edcbe834..31cfdb0794fb 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3210,6 +3210,7 @@ static void task_numa_work(struct callback_head *work) do { if (!vma_migratable(vma) || !vma_policy_mof(vma) || is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) { + trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_UNSUITABLE); continue; } @@ -3220,15 +3221,19 @@ static void task_numa_work(struct callback_head *work) * as migrating the pages will be of marginal benefit. */ if (!vma->vm_mm || - (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ))) + (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ))) { + trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_SHARED_RO); continue; + } /* * Skip inaccessible VMAs to avoid any confusion between * PROT_NONE and NUMA hinting ptes */ - if (!vma_is_accessible(vma)) + if (!vma_is_accessible(vma)) { + trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_INACCESSIBLE); continue; + } /* Initialise new per-VMA NUMAB state. */ if (!vma->numab_state) { @@ -3250,12 +3255,16 @@ static void task_numa_work(struct callback_head *work) * delay the scan for new VMAs. */ if (mm->numa_scan_seq && time_before(jiffies, - vma->numab_state->next_scan)) + vma->numab_state->next_scan)) { + trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_SCAN_DELAY); continue; + } /* Do not scan the VMA if task has not accessed */ - if (!vma_is_accessed(vma)) + if (!vma_is_accessed(vma)) { + trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_PID_INACTIVE); continue; + } /* * RESET access PIDs regularly for old VMAs. Resetting after checking |