2020년 12월 11일 (금) 오전 1:04, Georgi Djakov <georgi.djakov@xxxxxxxxxx>님이 작성: > > From: Liam Mark <lmark@xxxxxxxxxxxxxx> > > Collect the time for each allocation recorded in page owner so that > allocation "surges" can be measured. > > Record the pid for each allocation recorded in page owner so that the > source of allocation "surges" can be better identified. > > The above is very useful when doing memory analysis. On a crash for > example, we can get this information from kdump (or ramdump) and parse it > to figure out memory allocation problems. > > Please note that on x86_64 this increases the size of struct page_owner > from 16 bytes to 32. > > Vlastimil: it's not a functionality intended for production, so unless > somebody says they need to enable page_owner for debugging and this > increase prevents them from fitting into available memory, let's not > complicate things with making this optional. > > Signed-off-by: Liam Mark <lmark@xxxxxxxxxxxxxx> > Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx> > Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > Cc: Jonathan Corbet <corbet@xxxxxxx> Acked-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> This is useful. Our company already has an in-house patch to store pid since a few years ago. Thanks.
