linux-kernel - Re: [PATCH 0/5] page reclaim throttle v7

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 05 Jun 2008 11:23:08 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/5] page reclaim throttle v7

Hi kame-san,

> I like this series and I'd like to support this under memcg when
> this goes to mainline. (it seems better to test this for a while
> before adding some memcg-related changes.)
> 
> Then, please give me inputs.
> What do you think do I have to do for supporting this in memcg ?
> Handling the case of scan_global_lru(sc)==false is enough ?

my patch have 2 improvement.
1. ristrict reclaiming parallerism of #task (throttle)
2. reclaiming cut off if other task already freed enough memory.

we already consider #1 on memcg and works well.
but we doesn't support #2 on memcg because balbir-san's said
"memcg doesn't need it".

if you need improvement of #2, please change blow portion of my patch.

> +	/* reclaim still necessary? */
> +	if (scan_global_lru(sc) &&
> +	    freed - sc->was_freed >= threshold) {
> +		if (zone_watermark_ok(zone, sc->order, zone->pages_high,
> +				      gfp_zone(sc->gfp_mask), 0)) {
> +			ret = -EAGAIN;
> +			goto out;
> +		}
> +		sc->was_freed = freed;
> +	}
> 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/