lkml.org 
[lkml]   [2022]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 8/8] mm: Centralize & improve oom reporting in show_mem.c
On Tue 26-04-22 03:26:12, Kent Overstreet wrote:
[...]
> Anyways, the reason I think this allocation is fine is it's GFP_NOWAIT and it's
> completely fine if it fails - all we lose is some diagnostics, and also it's
> released right away.

I think you are still missing the PF_MEMALLOC point. Please have a look
how this leads to no reclaim recursion so GFP_NOWAIT has no meaning when
you are allocating from PF_MEMALLOC context (which the oom killer and
any reclaim path is). Also have a look at how __gfp_pfmemalloc_flags
makes the allocation request from that context ALLOC_NO_WATERMARKS.
See?
--
Michal Hocko
SUSE Labs

\
 
 \ /
  Last update: 2022-04-26 09:43    [W:0.243 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site