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authorGeorgi Djakov <georgi.djakov@linaro.org>2021-04-29 22:54:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-04-30 11:20:36 -0700
commit866b485262173a2b873386162b2ddcfbcb542b4a (patch)
treeb63068ea624c637d2a3bb8fc249dbc2f2fd4dbbd /Documentation/vm
parent0b5121ef85102edc936b199fb239a1f8cce48018 (diff)
downloadlinux-866b485262173a2b873386162b2ddcfbcb542b4a.tar.bz2
mm/page_owner: record the timestamp of all pages during free
Collect the time when each allocation is freed, to help with memory analysis with kdump/ramdump. Add the timestamp also in the page_owner debugfs file and print it in dump_page(). Having another timestamp when we free the page helps for debugging page migration issues. For example both alloc and free timestamps being the same can gave hints that there is an issue with migrating memory, as opposed to a page just being dropped during migration. Link: https://lkml.kernel.org/r/20210203175905.12267-1-georgi.djakov@linaro.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/vm')
-rw-r--r--Documentation/vm/page_owner.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/vm/page_owner.rst b/Documentation/vm/page_owner.rst
index 4e67c2e9bbed..2175465c9bf2 100644
--- a/Documentation/vm/page_owner.rst
+++ b/Documentation/vm/page_owner.rst
@@ -47,7 +47,7 @@ size change due to this facility.
text data bss dec hex filename
48800 2445 644 51889 cab1 mm/page_alloc.o
- 6574 108 29 6711 1a37 mm/page_owner.o
+ 6662 108 29 6799 1a8f mm/page_owner.o
1025 8 8 1041 411 mm/page_ext.o
Although, roughly, 8 KB code is added in total, page_alloc.o increase by