Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-24 21:21:41 +00:00
Code Issues Packages Projects Releases Wiki Activity

trace/events/page_ref: trace the raw page mapcount value

Browse Source 
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>
This commit is contained in:
David Hildenbrand 2024-04-09 21:22:58 +02:00 committed by Andrew Morton
parent f2f8a7a006
commit 6eca325674
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/trace/events/page_ref.h
View File

@ -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;