linux-kernel - Re: [PATCH] xfs: remove kmem_zalloc

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Date:   Tue, 7 Mar 2017 06:00:54 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dave Chinner <david@...morbit.com>
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Brian Foster <bfoster@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Xiong Zhou <xzhou@...hat.com>, linux-xfs@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] xfs: remove kmem_zalloc_greedy

On Tue, Mar 07, 2017 at 11:54:20AM +1100, Dave Chinner wrote:
> > Or maybe I've misunderstood, and you're asking if we should try
> > kmem_zalloc(4 pages), then kmem_zalloc(1 page), and only then switch to
> > the __vmalloc calls?
> 
> Just call kmem_zalloc_large() for 4 pages without a fallback on
> failure - that's exactly how we handle allocations for things like
> the 64k xattr buffers....

Yeah, that sounds fine.  I didn't remember that we actually tried
kmalloc before vmalloc for kmem_zalloc_large.