Commit 1be334e5 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds

mm/page_alloc.c: ratelimit allocation failure warnings more aggressively

While investigating a bug related to higher atomic allocation failures,
we noticed the failure warnings positively drowning the console, and in
our case trigger lockup warnings because of a serial console too slow to
handle all that output.

But even if we had a faster console, it's unclear what additional
information the current level of repetition provides.

Allocation failures happen for three reasons: The machine is OOM, the VM
is failing to handle reasonable requests, or somebody is making
unreasonable requests (and didn't acknowledge their opportunism with
__GFP_NOWARN).  Having the memory dump, a callstack, and the ratelimit
stats on skipped failure warnings should provide enough information to
let users/admins/developers know whether something is wrong and point
them in the right direction for debugging, bpftracing etc.

Limit allocation failure warnings to one spew every ten seconds.

Link: http://lkml.kernel.org/r/20191028194906.26899-1-hannes@cmpxchg.orgSigned-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ec649c9d
...@@ -3728,10 +3728,6 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, ...@@ -3728,10 +3728,6 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask) static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask)
{ {
unsigned int filter = SHOW_MEM_FILTER_NODES; unsigned int filter = SHOW_MEM_FILTER_NODES;
static DEFINE_RATELIMIT_STATE(show_mem_rs, HZ, 1);
if (!__ratelimit(&show_mem_rs))
return;
/* /*
* This documents exceptions given to allocations in certain * This documents exceptions given to allocations in certain
...@@ -3752,8 +3748,7 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) ...@@ -3752,8 +3748,7 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...)
{ {
struct va_format vaf; struct va_format vaf;
va_list args; va_list args;
static DEFINE_RATELIMIT_STATE(nopage_rs, DEFAULT_RATELIMIT_INTERVAL, static DEFINE_RATELIMIT_STATE(nopage_rs, 10*HZ, 1);
DEFAULT_RATELIMIT_BURST);
if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs)) if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs))
return; return;
......
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