Re: [PATCH] show per-process swap usage via procfs
From: KOSAKI Motohiro
Date: Thu Nov 05 2009 - 09:41:55 EST
2009/11/4 KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>:
>
> Passed several tests and one bug was fixed since RFC version.
> This patch is against mmotm.
> =
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
>
> Now, anon_rss and file_rss is counted as RSS and exported via /proc.
> RSS usage is important information but one more information which
> is often asked by users is "usage of swap".(user support team said.)
>
> This patch counts swap entry usage per process and show it via
> /proc/<pid>/status. I think status file is robust against new entry.
> Then, it is the first candidate..
>
> After this, /proc/<pid>/status includes following line
> <snip>
> VmPeak: 315360 kB
> VmSize: 315360 kB
> VmLck: 0 kB
> VmHWM: 180452 kB
> VmRSS: 180452 kB
> VmData: 311624 kB
> VmStk: 84 kB
> VmExe: 4 kB
> VmLib: 1568 kB
> VmPTE: 640 kB
> VmSwap: 131240 kB <=== new information
>
> Note:
> Because this patch catches swap_pte on page table, this will
> not catch shmem's swapout. It's already accounted in per-shmem
> inode and we don't need to do more.
Sidenote: top(1) can show SWAP usage. but it is crazy buggy
implementation. it define
VIRT = SWAP + RES (see man top or actual source code). this patch help
to fix its insane
calculation.
Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
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