linux-kernel - Re: How Inactive may be much greather than cached?

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: <4717367C.1040902@sw.ru>
Date:	Thu, 18 Oct 2007 14:33:32 +0400
From:	Vasily Averin <vvs@...ru>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, devel@...nvz.org
Subject: Re: How Inactive may be much greather than cached?

Nick Piggin wrote:
> Some filesystems, including I believe, ext3 with data=ordered,
> can leave orphaned pages around after they have been truncated
> out of the pagecache. These pages get left on the LRU and vmscan
> reclaims them pretty easily.
> 
> Try ext3 data=writeback, or even ext2.

thanks, data=writeback helps.

Resume: ext3 with data=ordered gets bh with data and moves it to journal
transaction. If transaction handled immediately, ext3 frees bh on this page, and
then frees this page.
However if journal delays processing of this transaction, ext3 cannot free bh
that is still busy. Later jbd layer decrements bh counter but it makes nothing
with data page that is not freed and stays inactive.
-
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/