Re: [RFC PATCH] memcg, oom: throttle dump_header for memcg ooms without eligible tasks

[Tetsuo Handa]

On 2018/10/16 18:20, Michal Hocko wrote:
>> Anyway, I'm OK if we apply _BOTH_ your patch and my patch. Or I'm OK with simplified
>> one shown below (because you don't like per memcg limit).
> 
> My patch is adding a rate-limit! I really fail to see why we need yet
> another one on top of it. This is just ridiculous. I can see reasons to
> tune that rate limit but adding 2 different mechanisms is just wrong.
> 
> If your NAK to unify the ratelimit for dump_header for all paths
> still holds then I do not care too much to push it forward. But I find
> thiis way of the review feedback counter productive.
> 

Your patch is _NOT_ adding a rate-limit for

  "%s invoked oom-killer: gfp_mask=%#x(%pGg), nodemask=%*pbl, order=%d, oom_score_adj=%hd\n"
  "Out of memory and no killable processes...\n"

lines!

[   97.519229] Out of memory and no killable processes...
[   97.522060] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.525507] Out of memory and no killable processes...
[   97.528817] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.532345] Out of memory and no killable processes...
[   97.534813] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.538270] Out of memory and no killable processes...
[   97.541449] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.546268] Out of memory and no killable processes...
[   97.548823] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.552399] Out of memory and no killable processes...
[   97.554939] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.558616] Out of memory and no killable processes...
[   97.562257] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.565998] Out of memory and no killable processes...
[   97.568642] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.572169] Out of memory and no killable processes...
[   97.575200] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.579357] Out of memory and no killable processes...
[   97.581912] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.585414] Out of memory and no killable processes...
[   97.589191] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.593586] Out of memory and no killable processes...
[   97.596527] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.600118] Out of memory and no killable processes...
[   97.603237] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.606837] Out of memory and no killable processes...
[   97.611550] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.615244] Out of memory and no killable processes...
[   97.617859] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.621634] Out of memory and no killable processes...
[   97.624884] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.629256] Out of memory and no killable processes...
[   97.631885] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.635367] Out of memory and no killable processes...
[   97.638033] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.641827] Out of memory and no killable processes...
[   97.641993] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.648453] Out of memory and no killable processes...
[   97.651481] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.655082] Out of memory and no killable processes...
[   97.657941] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.663036] Out of memory and no killable processes...
[   97.665890] a.out invoked oom-killer: gfp_mask=0x6000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=-1000
[   97.669473] Out of memory and no killable processes...

We don't need to print these lines every few milliseconds. Even if an exceptional case,
this is a DoS for console users. Printing once (or a few times) per a minute will be
enough. Otherwise, users cannot see what they are typing and what are printed.