[procps] Re: [PATCH] library: handle memory used by tmpfs
- From: Jakob Unterwurzacher <jakobunt@xxxxxxxxx>
- To: Jaromir Capik <jcapik@xxxxxxxxxx>, procps@xxxxxxxxxxxxx
- Date: Thu, 16 Jan 2014 21:20:57 +0100
On 16.01.2014 18:27, Jaromir Capik wrote:
> Hello Jakob.
>
>> For some reason, the kernel accounts tmpfs memory into both the page
>> cache and shared memory (
>> http://lxr.free-electrons.com/source/mm/shmem.c#L301 , at least since
>> kernel 3.0 ). The tools just pass it on, so what top and free report as
>> "cached" is actually the sum of page cache and tmpfs.
>
> Thank you for digging into the tmpfs stuff.
> The code is intended for use with 2.6.x and 3.x series kernel
> and your patch does the subtraction unconditionally.
> It would be better to do some research first so that we could
> cover all supported kernel versions and not just the 3.x and later.
>
> Are you able and willing to find the exact kernel version that
> brings the change and document that?
True, I only traced it to 3.0 - I'll take a look at 2.6 next week.
Best regards,
Jakob
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