lkml.org 
[lkml]   [2019]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] net/skbuff: silence warnings under memory pressure
From
Date
On Tue, 2019-09-03 at 15:22 +0200, Michal Hocko wrote:
> On Fri 30-08-19 18:15:22, Eric Dumazet wrote:
> > If there is a risk of flooding the syslog, we should fix this generically
> > in mm layer, not adding hundred of __GFP_NOWARN all over the places.
>
> We do already ratelimit in warn_alloc. If it isn't sufficient then we
> can think of a different parameters. Or maybe it is the ratelimiting
> which doesn't work here. Hard to tell and something to explore.

The time-based ratelimit won't work for skb_build() as when a system under
memory pressure, and the CPU is fast and IO is so slow, it could take a long
time to swap and trigger OOM.

I suppose what happens is those skb_build() allocations are from softirq, and
once one of them failed, it calls printk() which generates more interrupts.
Hence, the infinite loop.

\
 
 \ /
  Last update: 2019-09-03 17:43    [W:0.089 / U:3.416 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site