linux-kernel - Re: [PATCH] remove throttle_vm

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 for Android: free password hash cracker in your pocket

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

Message-Id: <1191612043.6715.139.camel@heimdal.trondhjem.org>
Date:	Fri, 05 Oct 2007 15:20:43 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	wfg@...l.ustc.edu.cn, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remove throttle_vm_writeout()

On Fri, 2007-10-05 at 20:32 +0200, Peter Zijlstra wrote:
> Well, the thing is, we throttle pageout in throttle_vm_writeout(). As it
> stand we can deadlock there because it just waits for the numbers to
> drop, and unstable pages don't automagically dissapear. Only
> write_inodes() - normally called from balance_dirty_pages() will call
> COMMIT.
> 
> So my thought was that calling pageout() on an unstable page would do
> the COMMIT - we're low on memory, otherwise we would not be paging, so
> getting rid of unstable pages seems to make sense to me.

Why not rather track which mappings have large numbers of outstanding
unstable writes at the VM level, and then add some form of callback to
allow it to notify the filesystem when it needs to flush them out?

Cheers
  Trond

-
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/