linux-kernel - Re: vmalloc with GFP

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Date:   Tue, 24 Apr 2018 21:10:08 +0200
From:   Richard Weinberger <richard@....at>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Artem Bityutskiy <dedekind1@...il.com>,
        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>,
        Steven Whitehouse <swhiteho@...hat.com>,
        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

[resending without html ...]

Am Dienstag, 24. April 2018, 18:27:12 CEST schrieb Michal Hocko:
> Hi,
> it seems that we still have few vmalloc users who perform GFP_NOFS
> allocation:
> drivers/mtd/ubi/io.c

UBI is not a big deal. We use it here like in UBIFS for debugging
when self-checks are enabled.

> fs/ext4/xattr.c
> fs/gfs2/dir.c
> fs/gfs2/quota.c
> fs/nfs/blocklayout/extent_tree.c
> fs/ubifs/debug.c
> fs/ubifs/lprops.c
> fs/ubifs/lpt_commit.c
> fs/ubifs/orphan.c

All users in UBIFS are debugging code and some error reporting.
No fast paths.
I think we can switch to prealloation + locking without much hassle.
I can prepare a patch.

Thanks,
//richard