linux-ext4 - Re: vmalloc with GFP

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Message-ID: <20180424200927.GU17484@dhcp22.suse.cz>
Date:   Tue, 24 Apr 2018 14:09:27 -0600
From:   Michal Hocko <mhocko@...nel.org>
To:     Steven Whitehouse <swhiteho@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Bob Peterson <rpeterso@...hat.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        linux-mtd@...ts.infradead.org, linux-ext4@...r.kernel.org,
        cluster-devel@...hat.com, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: vmalloc with GFP_NOFS

On Tue 24-04-18 20:26:23, Steven Whitehouse wrote:
[...]
> It would be good to fix this, and it has been known as an issue for a long
> time. We might well be able to make use of the new API though. It might be
> as simple as adding the calls when we get & release glocks, but I'd have to
> check the code to be sure,

Yeah, starting with annotating those locking contexts and how document
how their are used in the reclaim is the great first step. This has to
be done per-fs obviously.
-- 
Michal Hocko
SUSE Labs