Re: [PATCH 2/2] memcg: add mlock statistic in memory.stat

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

On Fri, Apr 27, 2012 at 3:14 PM, Ying Han <yinghan@xxxxxxxxxx> wrote:
> We have the nr_mlock stat both in meminfo as well as vmstat system wide, this
> patch adds the mlock field into per-memcg memory stat. The stat itself enhances
> the metrics exported by memcg since the unevictable lru includes more than
> mlock()'d page like SHM_LOCK'd.
> Why we need to count mlock'd pages while they are unevictable and we can not
> do much on them anyway?
> This is true. The mlock stat I am proposing is more helpful for system admin
> and kernel developer to understand the system workload. The same information
> should be helpful to add into OOM log as well. Many times in the past that we
> need to read the mlock stat from the per-container meminfo for different
> reason. Afterall, we do have the ability to read the mlock from meminfo and
> this patch fills the info in memcg.
> Note:
> Here are the places where I didn't add the hook:
> 1. in the mlock_migrate_page() since the owner of oldpage and newpage is the same.
> 2. in the freeing path since page shouldn't get to there at the first place.

Looks good. (even though I don't like unreliable mlock statistics)
 Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>

To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: .
Fight unfair telecom internet charges in Canada: sign
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>

[Site Home]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Tools]     [DDR & Rambus]     [Asterisk Internet PBX]     [Linux API]     [Monitors]

Add to Google Google PageRank Checking tool