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authorDavid Hildenbrand <david@redhat.com>2024-04-09 21:22:58 +0200
committerAndrew Morton <akpm@linux-foundation.org>2024-05-05 17:53:31 -0700
commit6eca32567455db2db38b1126e0d6ad8f0e5c3ed9 (patch)
tree270758de0180b1194c0a78dad43d346931bb04d2 /include/trace
parentf2f8a7a006dca086d942eec2e469f8d831b62443 (diff)
trace/events/page_ref: trace the raw page mapcount value
We want to limit the use of page_mapcount() to the places where it is absolutely necessary. We already trace raw page->refcount, raw page->flags and raw page->mapping, and don't involve any folios. Let's also trace the raw mapcount value that does not consider the entire mapcount of large folios, and we don't add "1" to it. When dealing with typed folios, this makes a lot more sense. ... and it's for debugging purposes only either way. Link: https://lkml.kernel.org/r/20240409192301.907377-16-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Chris Zankel <chris@zankel.net> Cc: Hugh Dickins <hughd@google.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Cc: Peter Xu <peterx@redhat.com> Cc: Richard Chang <richardycc@google.com> Cc: Rich Felker <dalias@libc.org> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Yang Shi <shy828301@gmail.com> Cc: Yin Fengwei <fengwei.yin@intel.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/page_ref.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/trace/events/page_ref.h b/include/trace/events/page_ref.h
index 8a99c1cd417b..fe33a255b7d0 100644
--- a/include/trace/events/page_ref.h
+++ b/include/trace/events/page_ref.h
@@ -30,7 +30,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_template,
__entry->pfn = page_to_pfn(page);
__entry->flags = page->flags;
__entry->count = page_ref_count(page);
- __entry->mapcount = page_mapcount(page);
+ __entry->mapcount = atomic_read(&page->_mapcount);
__entry->mapping = page->mapping;
__entry->mt = get_pageblock_migratetype(page);
__entry->val = v;
@@ -79,7 +79,7 @@ DECLARE_EVENT_CLASS(page_ref_mod_and_test_template,
__entry->pfn = page_to_pfn(page);
__entry->flags = page->flags;
__entry->count = page_ref_count(page);
- __entry->mapcount = page_mapcount(page);
+ __entry->mapcount = atomic_read(&page->_mapcount);
__entry->mapping = page->mapping;
__entry->mt = get_pageblock_migratetype(page);
__entry->val = v;