Re: [PATCH] proc.5: Document inaccurate RSS due to SPLIT_RSS_COUNTING

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Hi Jann,

On 10/12/20 4:52 PM, Jann Horn wrote:
> On Mon, Oct 12, 2020 at 1:49 PM Jann Horn <jannh@xxxxxxxxxx> wrote:
>> Since 34e55232e59f7b19050267a05ff1226e5cd122a5 (introduced back in
>> v2.6.34), Linux uses per-thread RSS counters to reduce cache contention on
>> the per-mm counters. With a 4K page size, that means that you can end up
>> with the counters off by up to 252KiB per thread.
> 
> Actually, as Mark Mossberg pointed out to me off-thread, the counters
> can actually be off by many times more... 

So, does your patch to proc.5 need tweaking, or can I just apply as is?

Thanks,

Michael



-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/



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