linux-kernel - Re: [PATCH 7/7] Compact memory directly by a process when a high-order allocation fails

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: <20070621052813.ac93e12e.akpm@linux-foundation.org>
Date:	Thu, 21 Jun 2007 05:28:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, mel@....ul.ie,
	kamezawa.hiroyu@...fujitsu.com, clameter@....com
Subject: Re: [PATCH 7/7] Compact memory directly by a process when a
 high-order allocation fails

> On Mon, 18 Jun 2007 10:30:42 +0100 (IST) Mel Gorman <mel@....ul.ie> wrote:
> +
> +			/*
> +			 * It's a race if compaction frees a suitable page but
> +			 * someone else allocates it
> +			 */
> +			count_vm_event(COMPACTRACE);
> +		}

Could perhaps cause arbitrarily long starvation.  A fix would be to free
the synchronously-compacted higher-order page into somewhere which is
private to this task (a new field in task_struct would be one such place).
-
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/