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mm: add per-order mTHP swpin counters
This helps profile the sizes of folios being swapped in. Currently, only mTHP swap-out is being counted. The new interface can be found at: /sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats swpin For example, cat /sys/kernel/mm/transparent_hugepage/hugepages-64kB/stats/swpin 12809 cat /sys/kernel/mm/transparent_hugepage/hugepages-32kB/stats/swpin 4763 [v-songbaohua@oppo.com: add a blank line in doc] Link: https://lkml.kernel.org/r/20241030233423.80759-1-21cnbao@gmail.com Link: https://lkml.kernel.org/r/20241026082423.26298-1-21cnbao@gmail.com Signed-off-by: Barry Song <v-songbaohua@oppo.com> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Chris Li <chrisl@kernel.org> Cc: Yosry Ahmed <yosryahmed@google.com> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Kairui Song <kasong@tencent.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Kanchana P Sridhar <kanchana.p.sridhar@intel.com> Cc: Usama Arif <usamaarif642@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -534,6 +534,10 @@ zswpout
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is incremented every time a huge page is swapped out to zswap in one
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piece without splitting.
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swpin
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is incremented every time a huge page is swapped in from a non-zswap
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swap device in one piece.
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swpout
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is incremented every time a huge page is swapped out to a non-zswap
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swap device in one piece without splitting.
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@ -120,6 +120,7 @@ enum mthp_stat_item {
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MTHP_STAT_ANON_FAULT_FALLBACK,
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MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
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MTHP_STAT_ZSWPOUT,
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MTHP_STAT_SWPIN,
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MTHP_STAT_SWPOUT,
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MTHP_STAT_SWPOUT_FALLBACK,
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MTHP_STAT_SHMEM_ALLOC,
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@ -616,6 +616,7 @@ DEFINE_MTHP_STAT_ATTR(anon_fault_alloc, MTHP_STAT_ANON_FAULT_ALLOC);
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DEFINE_MTHP_STAT_ATTR(anon_fault_fallback, MTHP_STAT_ANON_FAULT_FALLBACK);
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DEFINE_MTHP_STAT_ATTR(anon_fault_fallback_charge, MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE);
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DEFINE_MTHP_STAT_ATTR(zswpout, MTHP_STAT_ZSWPOUT);
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DEFINE_MTHP_STAT_ATTR(swpin, MTHP_STAT_SWPIN);
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DEFINE_MTHP_STAT_ATTR(swpout, MTHP_STAT_SWPOUT);
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DEFINE_MTHP_STAT_ATTR(swpout_fallback, MTHP_STAT_SWPOUT_FALLBACK);
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#ifdef CONFIG_SHMEM
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@ -635,6 +636,7 @@ static struct attribute *anon_stats_attrs[] = {
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&anon_fault_fallback_charge_attr.attr,
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#ifndef CONFIG_SHMEM
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&zswpout_attr.attr,
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&swpin_attr.attr,
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&swpout_attr.attr,
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&swpout_fallback_attr.attr,
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#endif
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@ -666,6 +668,7 @@ static struct attribute_group file_stats_attr_grp = {
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static struct attribute *any_stats_attrs[] = {
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#ifdef CONFIG_SHMEM
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&zswpout_attr.attr,
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&swpin_attr.attr,
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&swpout_attr.attr,
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&swpout_fallback_attr.attr,
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#endif
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@ -495,6 +495,7 @@ static void sio_read_complete(struct kiocb *iocb, long ret)
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for (p = 0; p < sio->pages; p++) {
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struct folio *folio = page_folio(sio->bvec[p].bv_page);
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count_mthp_stat(folio_order(folio), MTHP_STAT_SWPIN);
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count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
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folio_mark_uptodate(folio);
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folio_unlock(folio);
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@ -589,6 +590,7 @@ static void swap_read_folio_bdev_sync(struct folio *folio,
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* attempt to access it in the page fault retry time check.
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*/
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get_task_struct(current);
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count_mthp_stat(folio_order(folio), MTHP_STAT_SWPIN);
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count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
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count_vm_events(PSWPIN, folio_nr_pages(folio));
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submit_bio_wait(&bio);
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@ -605,6 +607,7 @@ static void swap_read_folio_bdev_async(struct folio *folio,
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bio->bi_iter.bi_sector = swap_folio_sector(folio);
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bio->bi_end_io = end_swap_bio_read;
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bio_add_folio_nofail(bio, folio, folio_size(folio), 0);
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count_mthp_stat(folio_order(folio), MTHP_STAT_SWPIN);
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count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
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count_vm_events(PSWPIN, folio_nr_pages(folio));
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submit_bio(bio);
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