[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240814062830.26833-5-kanchana.p.sridhar@intel.com>
Date: Tue, 13 Aug 2024 23:28:30 -0700
From: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
To: linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
hannes@...xchg.org,
yosryahmed@...gle.com,
nphamcs@...il.com,
ryan.roberts@....com,
ying.huang@...el.com,
21cnbao@...il.com,
akpm@...ux-foundation.org
Cc: nanhai.zou@...el.com,
wajdi.k.feghali@...el.com,
vinodh.gopal@...el.com,
kanchana.p.sridhar@...el.com
Subject: [RFC PATCH v1 4/4] mm: page_io: Count successful mTHP zswap stores in vmstat.
Added count_zswap_thp_swpout_vm_event() that will increment the
appropriate mTHP/PMD vmstat event counters if zswap_store succeeds for
a large folio:
zswap_store mTHP order [0, HPAGE_PMD_ORDER-1] will increment these
vmstat event counters:
ZSWPOUT_4KB_FOLIO
mTHP_ZSWPOUT_8kB
mTHP_ZSWPOUT_16kB
mTHP_ZSWPOUT_32kB
mTHP_ZSWPOUT_64kB
mTHP_ZSWPOUT_128kB
mTHP_ZSWPOUT_256kB
mTHP_ZSWPOUT_512kB
mTHP_ZSWPOUT_1024kB
zswap_store of a PMD-size THP, i.e., mTHP order HPAGE_PMD_ORDER, will
increment both these vmstat event counters:
ZSWPOUT_PMD_THP_FOLIO
mTHP_ZSWPOUT_2048kB
Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
---
mm/page_io.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/mm/page_io.c b/mm/page_io.c
index 0a150c240bf4..ab54d2060cc4 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -172,6 +172,49 @@ int generic_swapfile_activate(struct swap_info_struct *sis,
goto out;
}
+/*
+ * Count vmstats for ZSWAP store of large folios (mTHP and PMD-size THP).
+ */
+static inline void count_zswap_thp_swpout_vm_event(struct folio *folio)
+{
+ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && folio_test_pmd_mappable(folio)) {
+ count_vm_event(ZSWPOUT_PMD_THP_FOLIO);
+ count_vm_event(mTHP_ZSWPOUT_2048kB);
+ } else if (folio_order(folio) == 0) {
+ count_vm_event(ZSWPOUT_4KB_FOLIO);
+ } else if (IS_ENABLED(CONFIG_THP_SWAP)) {
+ switch (folio_order(folio)) {
+ case 1:
+ count_vm_event(mTHP_ZSWPOUT_8kB);
+ break;
+ case 2:
+ count_vm_event(mTHP_ZSWPOUT_16kB);
+ break;
+ case 3:
+ count_vm_event(mTHP_ZSWPOUT_32kB);
+ break;
+ case 4:
+ count_vm_event(mTHP_ZSWPOUT_64kB);
+ break;
+ case 5:
+ count_vm_event(mTHP_ZSWPOUT_128kB);
+ break;
+ case 6:
+ count_vm_event(mTHP_ZSWPOUT_256kB);
+ break;
+ case 7:
+ count_vm_event(mTHP_ZSWPOUT_512kB);
+ break;
+ case 8:
+ count_vm_event(mTHP_ZSWPOUT_1024kB);
+ break;
+ case 9:
+ count_vm_event(mTHP_ZSWPOUT_2048kB);
+ break;
+ }
+ }
+}
+
/*
* We may have stale swap cache pages in memory: notice
* them here and get rid of the unnecessary final write.
@@ -196,6 +239,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
return ret;
}
if (zswap_store(folio)) {
+ count_zswap_thp_swpout_vm_event(folio);
folio_start_writeback(folio);
folio_unlock(folio);
folio_end_writeback(folio);
--
2.27.0
Powered by blists - more mailing lists