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| author | David Hildenbrand <david@redhat.com> | 2024-04-09 21:23:00 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-05-05 17:53:31 -0700 |
| commit | 7441d34922ba1aba7bbb069c27bcaabdc515f34e (patch) | |
| tree | 2a5b54bbdea356fc3c36728ad4e681ae9f907d3c | |
| parent | 5f8856cdae5db200844630e660f1a64eb1560578 (diff) | |
| download | linux-7441d34922ba1aba7bbb069c27bcaabdc515f34e.tar.gz linux-7441d34922ba1aba7bbb069c27bcaabdc515f34e.tar.bz2 linux-7441d34922ba1aba7bbb069c27bcaabdc515f34e.zip | |
mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio()
Let's simplify and only print the page mapcount: we already print the
large folio mapcount and the entire folio mapcount for large folios
separately; that should be sufficient to figure out what's happening.
While at it, print the page mapcount also if it had an underflow,
filtering out only typed pages.
Link: https://lkml.kernel.org/r/20240409192301.907377-18-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>
| -rw-r--r-- | mm/debug.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/mm/debug.c b/mm/debug.c index d064db42af54..69e524c3e601 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -55,15 +55,10 @@ static void __dump_folio(struct folio *folio, struct page *page, unsigned long pfn, unsigned long idx) { struct address_space *mapping = folio_mapping(folio); - int mapcount = atomic_read(&page->_mapcount) + 1; + int mapcount = atomic_read(&page->_mapcount); char *type = ""; - /* Open-code page_mapcount() to avoid looking up a stale folio */ - if (mapcount < 0) - mapcount = 0; - if (folio_test_large(folio)) - mapcount += folio_entire_mapcount(folio); - + mapcount = page_type_has_type(mapcount) ? 0 : mapcount + 1; pr_warn("page: refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n", folio_ref_count(folio), mapcount, mapping, folio->index + idx, pfn); |