From: David Rientjes <rientjes@google.com>
To: Glauber Costa <glommer@parallels.com>
Cc: Christoph Lameter <cl@linux.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@suse.cz>,
Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH] slab: Ignore internal flags in cache creation
Date: Wed, 26 Sep 2012 18:16:11 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1209261813300.7072@chino.kir.corp.google.com> (raw)
In-Reply-To: <5062C029.308@parallels.com>
On Wed, 26 Sep 2012, Glauber Costa wrote:
> So the problem I am facing here is that when I am creating caches from
> memcg, I would very much like to reuse their flags fields. They are
> stored in the cache itself, so this is not a problem. But slab also
> stores that flag, leading to the precise BUG_ON() on CREATE_MASK that
> you quoted.
>
> In this context, passing this flag becomes completely valid, I just need
> that to be explicitly masked out.
>
> What is your suggestion to handle this ?
>
I would suggest cachep->flags being used solely for the flags passed to
kmem_cache_create() and seperating out all "internal flags" based on the
individual slab allocator's implementation into a different field. There
should be no problem with moving CFLGS_OFF_SLAB elsewhere, in fact, I just
removed a "dflags" field from mm/slab.c's kmem_cache that turned out never
to be used. You could simply reintroduce a new "internal_flags" field and
use it at your discretion.
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next prev parent reply other threads:[~2012-09-27 1:16 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-25 11:17 Glauber Costa
2012-09-25 16:26 ` Christoph Lameter
2012-09-26 0:46 ` David Rientjes
2012-09-26 8:43 ` Glauber Costa
2012-09-27 1:16 ` David Rientjes [this message]
2012-09-27 6:59 ` Glauber Costa
2012-09-27 22:56 ` David Rientjes
2012-09-28 7:46 ` Glauber Costa
2012-09-28 20:25 ` David Rientjes
2012-09-28 14:12 ` Christoph Lameter
2012-09-28 20:39 ` David Rientjes
2012-09-28 21:20 ` Christoph Lameter
2012-09-28 23:11 ` David Rientjes
2012-10-01 17:54 ` Christoph Lameter
2012-10-01 7:28 ` Pekka Enberg
2012-10-01 7:58 ` Glauber Costa
2012-09-27 13:54 ` Christoph Lameter
2012-09-27 22:50 ` David Rientjes
2012-09-28 14:04 ` Christoph Lameter
2012-09-28 20:36 ` David Rientjes
2012-09-26 14:57 ` Christoph Lameter
2012-09-27 1:12 ` David Rientjes
2012-09-27 13:57 ` Christoph Lameter
2012-09-27 22:52 ` David Rientjes
2012-09-28 14:10 ` Christoph Lameter
2012-09-28 20:30 ` David Rientjes
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