From: Alasdair G Kergon <agk@redhat.com>
To: matthew patton <pattonme@yahoo.com>
Cc: linux-lvm@redhat.com
Subject: Re: [linux-lvm] heat map
Date: Mon, 24 Jun 2013 20:24:33 +0100 [thread overview]
Message-ID: <20130624192433.GB27846@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <1372057440.20206.YahooMailBasic@web181506.mail.ne1.yahoo.com>
On Mon, Jun 24, 2013 at 12:04:00AM -0700, matthew patton wrote:
> If some older man pages are to be believed there once was a capability
> to keep a heat map of busy extents. Is there a way to revive that
> capability? I expect "last I/O within 30 seconds, 5 minute, 15minute" is
> probably sufficient for most uses as well as summary counters along the
> same lines.
Mikulas is developing a replacement here:
http://people.redhat.com/~mpatocka/patches/kernel/dm-statistics/
Documentation appears at the end of the kernel patch.
If you want to try it out at the moment, you'll need this patch first I think:
http://people.redhat.com/agk/patches/linux/editing/dm-optimize-use-SRCU-and-RCU.patch
Alasdair
prev parent reply other threads:[~2013-06-24 19:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-24 7:04 [linux-lvm] heat map matthew patton
2013-06-24 19:24 ` Alasdair G Kergon [this message]
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