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mm/vmstat: add NRSWP{IN,OUT} counters

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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>
This commit is contained in:
Christoph Hellwig
2026-07-13 11:33:44 +02:00
committed by Andrew Morton
parent 0df74c1158
commit c01e6df60e
3 changed files with 11 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/vm_event_item.h
View File

@@ -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
};

2
mm/page_io.c
View File

@@ -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;

6
mm/vmstat.c
View File

@@ -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 */
};