linux-kernel - Re: [PATCH]vmscan: handle underflow for get_scan

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]

Message-ID: <20100402092441.GA21100@sli10-desk.sh.intel.com>
Date:	Fri, 2 Apr 2010 17:24:41 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Wu, Fengguang" <fengguang.wu@...el.com>
Subject: Re: [PATCH]vmscan: handle underflow for get_scan_ratio

On Fri, Apr 02, 2010 at 05:14:38PM +0800, KOSAKI Motohiro wrote:
> > > > This patch makes a lot of sense than previous. however I think <1% anon ratio
> > > > shouldn't happen anyway because file lru doesn't have reclaimable pages.
> > > > <1% seems no good reclaim rate.
> > > 
> > > Oops, the above mention is wrong. sorry. only 1 page is still too big.
> > > because under streaming io workload, the number of scanning anon pages should
> > > be zero. this is very strong requirement. if not, backup operation will makes
> > > a lot of swapping out.
> > Sounds there is no big impact for the workload which you mentioned with the patch.
> > please see below descriptions.
> > I updated the description of the patch as fengguang suggested.
> 
> Umm.. sorry, no.
> 
> "one fix but introduce another one bug" is not good deal. instead, 
> I'll revert the guilty commit at first as akpm mentioned.
Even we revert the commit, the patch still has its benefit, as it increases
calculation precision, right?

Thanks,
Shaohua
--
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/