linux-kernel - Re: [PATCH 11/11] blkcg: implement per-blkg request allocation

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Message-ID: <x49wr51usxi.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 27 Apr 2012 10:54:01 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, vgoyal@...hat.com, ctalbott@...gle.com,
	rni@...gle.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, containers@...ts.linux-foundation.org,
	fengguang.wu@...el.com, hughd@...gle.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 11/11] blkcg: implement per-blkg request allocation

Tejun Heo <tj@...nel.org> writes:

> This patch implements per-blkg request_list.  Each blkg has its own
> request_list and any IO allocates its request from the matching blkg
> making blkcgs completely isolated in terms of request allocation.

So, nr_requests is now actually nr_requests * # of blk cgroups.  Is that
right?  Are you at all concerned about the amount of memory that can be
tied up as the number of cgroups increases?

Cheers,
Jeff
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