From: Andrew Morton <akpm@linux-foundation.org>
To: David Rientjes <rientjes@google.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>,
mhocko@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] memcg: fix mutex not unlocked on memcg_create_kmem_cache fail path
Date: Thu, 30 Jan 2014 13:50:02 -0800 [thread overview]
Message-ID: <20140130135002.22ce1c12b7136f75e5985df6@linux-foundation.org> (raw)
In-Reply-To: <alpine.DEB.2.02.1401301336530.15271@chino.kir.corp.google.com>
On Thu, 30 Jan 2014 13:38:56 -0800 (PST) David Rientjes <rientjes@google.com> wrote:
> > > What's funnier is that tmp_name isn't required at all since
> > > kmem_cache_create_memcg() is just going to do a kstrdup() on it anyway, so
> > > you could easily just pass in the pointer to memory that has been
> > > allocated for s->name rather than allocating memory twice.
> >
> > We need a buffer to sprintf() into.
> >
>
> Yeah, it shouldn't be temporary it should be the one and only allocation.
> We should construct the name in memcg_create_kmem_cache() and be done with
> it.
Could. That would require converting memcg_create_kmem_cache() to take
a va_list and call kasprintf() on it.
The problem is that pesky rcu_read_lock() which is required around
cgroup_name() - we'd have to call memcg_create_kmem_cache() under
rcu_read_lock() so the usual GFP_foo limitations apply.
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next prev parent reply other threads:[~2014-01-30 21:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 16:01 Vladimir Davydov
2014-01-30 21:01 ` Andrew Morton
2014-01-30 21:14 ` David Rientjes
2014-01-30 21:29 ` Andrew Morton
2014-01-30 21:38 ` David Rientjes
2014-01-30 21:50 ` Andrew Morton [this message]
2014-01-30 22:04 ` David Rientjes
2014-01-30 22:09 ` Andrew Morton
2014-01-30 22:13 ` David Rientjes
2014-01-30 22:15 ` Andrew Morton
2014-01-30 22:39 ` David Rientjes
2014-01-31 6:53 ` Vladimir Davydov
2014-01-31 10:42 ` David Rientjes
2014-01-31 11:29 ` Vladimir Davydov
2014-01-30 21:36 ` David Rientjes
2014-01-30 21:09 ` David Rientjes
2014-01-31 15:39 boxerapp
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