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| author | Christoph Hellwig <hch@lst.de> | 2026-07-13 11:33:44 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-08-24 18:43:15 -0700 |
| commit | c01e6df60e7be422ee5ce5e2a76d43fb05fab4c2 (patch) | |
| tree | f29bee65b2a3b1c2cfa864a682bb26f579ee1c94 | |
| parent | 0df74c11587941b35596d1e8990dcab06bdbfeb5 (diff) | |
| download | linux-c01e6df60e7be422ee5ce5e2a76d43fb05fab4c2.tar.gz linux-c01e6df60e7be422ee5ce5e2a76d43fb05fab4c2.zip | |
mm/vmstat: add NRSWP{IN,OUT} counters
Count how many swap I/Os we cause. Due to batching this can be different
than the current counter number of pages written/read, and tracking this
information is useful to see how efficient the batching is.
The counters are added at the end of enum vm_event_item and the
vmstat_text array under the assumption that the order of fields in
/proc/vmstat is an ABI. If that is not the case, they could be grouped
with the other swap counters.
Link: https://lore.kernel.org/20260713093350.2154226-8-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Youngjun Park <youngjun.park@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/vm_event_item.h | 4 | ||||
| -rw-r--r-- | mm/page_io.c | 2 | ||||
| -rw-r--r-- | mm/vmstat.c | 6 |
3 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 03fe95f5a020..2628ccda076a 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -175,6 +175,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, KSTACK_REST, #endif #endif /* CONFIG_DEBUG_STACK_USAGE */ +#ifdef CONFIG_SWAP + NRSWPIN, + NRSWPOUT, +#endif /* CONFIG_SWAP */ NR_VM_EVENT_ITEMS }; diff --git a/mm/page_io.c b/mm/page_io.c index cea438b66bce..e4fa7ffffe8b 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -704,6 +704,7 @@ void swap_write_submit(struct swap_io_ctx *ctx) { if (!ctx->sio) return; + count_vm_events(NRSWPOUT, 1); ctx->sis->ops->submit_write(ctx); ctx->sio = NULL; ctx->sis = NULL; @@ -713,6 +714,7 @@ void swap_read_submit(struct swap_io_ctx *ctx) { if (!ctx->sio) return; + count_vm_events(NRSWPIN, 1); ctx->sis->ops->submit_read(ctx); ctx->sio = NULL; ctx->sis = NULL; diff --git a/mm/vmstat.c b/mm/vmstat.c index 7d6e61a01f51..cb57714539fb 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1502,7 +1502,11 @@ const char * const vmstat_text[] = { #if THREAD_SIZE > 65536 [I(KSTACK_REST)] = "kstack_rest", #endif -#endif +#endif /* CONFIG_DEBUG_STACK_USAGE */ +#ifdef CONFIG_SWAP + [I(NRSWPIN)] = "nrswpin", + [I(NRSWPOUT)] = "nrswpout", +#endif /* CONFIG_SWAP */ #undef I #endif /* CONFIG_VM_EVENT_COUNTERS */ }; |