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| author | Kassey Li <quic_yingangl@quicinc.com> | 2022-08-18 10:24:25 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-11 20:25:59 -0700 |
| commit | 8f0efa81dfbc6abf86bf410549e61a2636753c86 (patch) | |
| tree | 414635559a44137f109ca936ebb00c70c4b30ac5 /Documentation/mm | |
| parent | 72c33ef4c02e32e2884e7688ec878a486913fe9c (diff) | |
| download | linux-8f0efa81dfbc6abf86bf410549e61a2636753c86.tar.bz2 | |
mm/page_owner.c: add llseek for page_owner
It is too slow to dump all the pages, in some usage we just want to dump a
given start pfn, for example: a CMA range or a single page.
To speed up and save time, this change allows specifying of a start pfn by
adding llseek for page_owner.
Link: https://lkml.kernel.org/r/20220818022425.31056-1-quic_yingangl@quicinc.com
Signed-off-by: Kassey Li <quic_yingangl@quicinc.com>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/mm')
| -rw-r--r-- | Documentation/mm/page_owner.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/mm/page_owner.rst b/Documentation/mm/page_owner.rst index f5c954afe97c..f18fd8907049 100644 --- a/Documentation/mm/page_owner.rst +++ b/Documentation/mm/page_owner.rst @@ -94,6 +94,11 @@ Usage Page allocated via order XXX, ... PFN XXX ... // Detailed stack + By default, it will do full pfn dump, to start with a given pfn, + page_owner supports fseek. + + FILE *fp = fopen("/sys/kernel/debug/page_owner", "r"); + fseek(fp, pfn_start, SEEK_SET); The ``page_owner_sort`` tool ignores ``PFN`` rows, puts the remaining rows in buf, uses regexp to extract the page order value, counts the times |