linux-kernel - Re: [RFC PATCH] mm: introduce kv[mz]alloc helpers

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Message-ID: <20161209063803.GY1555@ZenIV.linux.org.uk>
Date:   Fri, 9 Dec 2016 06:38:04 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Dave Chinner <david@...morbit.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Anatoly Stepanov <astepanov@...udlinux.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Theodore Ts'o <tytso@....edu>, kvm@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org
Subject: Re: [RFC PATCH] mm: introduce kv[mz]alloc helpers

On Fri, Dec 09, 2016 at 07:22:25AM +0100, Michal Hocko wrote:

> > Easier to handle those in vmalloc() itself.
> 
> I think there were some attempts in the past but some of the code paths
> are burried too deep and adding gfp_mask all the way down there seemed
> like a major surgery.

No need to propagate gfp_mask - the same trick XFS is doing right now can
be done in vmalloc.c in a couple of places and that's it; I'll resurrect the
patches and post them tomorrow after I get some sleep.