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From: Dave Chinner <david@fromorbit.com>
To: Brian Foster <bfoster@redhat.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH v5 10/10] xfs: add background scanning to clear eofblocks inodes
Date: Tue, 23 Oct 2012 12:55:46 +1100	[thread overview]
Message-ID: <20121023015546.GN4291@dastard> (raw)
In-Reply-To: <1349446636-8611-11-git-send-email-bfoster@redhat.com>

On Fri, Oct 05, 2012 at 10:17:16AM -0400, Brian Foster wrote:
> Create a new mount workqueue and delayed_work to enable background
> scanning and freeing of eofblocks inodes. The scanner kicks in once
> speculative preallocation occurs and stops requeueing itself when
> no eofblocks inodes exist.
> 
> The scan interval is based on the new
> 'background_prealloc_discard_period' tunable (default to 5m). The

"discard" - probably a bad idea to use a word that is associated
with similar but different functionality (i.e. mount -o discard).

Something like "speculative_prealloc_lifetime" might be a better way
of describing what it defines. i.e. speculative prealloc won't be
kept longer than this period on clean inodes. That keeps the sysctl
function independent of the underlying implementation, and it also
means we can use it as a catchall for any future speculative
allocation functionality we decide to add....

....
> diff --git a/fs/xfs/xfs_globals.c b/fs/xfs/xfs_globals.c
> index 76e81cf..efea30a 100644
> --- a/fs/xfs/xfs_globals.c
> +++ b/fs/xfs/xfs_globals.c
> @@ -40,4 +40,5 @@ xfs_param_t xfs_params = {
>  	.rotorstep	= {	1,		1,		255	},
>  	.inherit_nodfrg	= {	0,		1,		1	},
>  	.fstrm_timer	= {	1,		30*100,		3600*100},
> +	.eofb_timer	= {	1,		300,		7200},

2 hours as the maximum might be too short for some people. e.g. once
a day might be all that some people will want this to happen because
they have slowly growing log files - they stay in cache, will most
likely trigger the "keep prealloc" heuristic, but can often go 5
minutes without being modified.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2012-10-23  1:54 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-05 14:17 [PATCH v5 00/10] speculative preallocation inode tracking Brian Foster
2012-10-05 14:17 ` [PATCH v5 01/10] xfs: add EOFBLOCKS inode tagging/untagging Brian Foster
2012-10-05 14:17 ` [PATCH v5 02/10] xfs: support a tag-based inode_ag_iterator Brian Foster
2012-10-05 14:17 ` [PATCH v5 03/10] xfs: create helper to check whether to free eofblocks on inode Brian Foster
2012-10-23  0:58   ` Dave Chinner
2012-10-05 14:17 ` [PATCH v5 04/10] xfs: make xfs_free_eofblocks() non-static, return EAGAIN on trylock failure Brian Foster
2012-10-05 14:17 ` [PATCH v5 05/10] xfs: create function to scan and clear EOFBLOCKS inodes Brian Foster
2012-10-23  1:01   ` Dave Chinner
2012-10-05 14:17 ` [PATCH v5 06/10] xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl Brian Foster
2012-10-11 14:13   ` Ben Myers
2012-10-11 22:35     ` Brian Foster
2012-10-15 22:46       ` Ben Myers
2012-10-15 23:49         ` Dave Chinner
2012-10-16  1:39           ` Dave Chinner
2012-10-17 22:40             ` Ben Myers
2012-10-18 12:16               ` Brian Foster
2012-10-18 15:46                 ` Ben Myers
2012-10-18 16:23                   ` Brian Foster
2012-10-22  7:34                 ` Dave Chinner
2012-10-22 13:23                   ` Brian Foster
2012-10-22 22:22                     ` Dave Chinner
2012-10-23  1:31   ` Dave Chinner
2012-10-24 16:16     ` Brian Foster
2012-10-24 19:27       ` Dave Chinner
2012-10-05 14:17 ` [PATCH v5 07/10] xfs: make xfs_quota_type() non-static Brian Foster
2012-10-23  1:31   ` Dave Chinner
2012-10-05 14:17 ` [PATCH v5 08/10] xfs: add quota id filtering to eofblocks scan Brian Foster
2012-10-23  1:42   ` Dave Chinner
2012-10-24 16:18     ` Brian Foster
2012-10-24 19:41       ` Dave Chinner
2012-10-24 23:02         ` Brian Foster
2012-10-25  0:02           ` Dave Chinner
2012-10-25  0:29             ` Brian Foster
2012-10-05 14:17 ` [PATCH v5 09/10] xfs: add minimum file size " Brian Foster
2012-10-23  1:43   ` Dave Chinner
2012-10-05 14:17 ` [PATCH v5 10/10] xfs: add background scanning to clear eofblocks inodes Brian Foster
2012-10-23  1:55   ` Dave Chinner [this message]
2012-10-19 21:02 ` [PATCH v5 00/10] speculative preallocation inode tracking Mark Tinguely
2012-10-21 14:00   ` Brian Foster
2012-10-21 17:53     ` Mark Tinguely
2012-10-21 20:31       ` Mark Tinguely
2012-10-21 22:28       ` Dave Chinner
2012-10-23 19:10 ` Ben Myers

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