linux-ext4 - Re: vmalloc with GFP

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Message-ID: <20180717124703.GA30926@dhcp22.suse.cz>
Date:   Tue, 17 Jul 2018 14:47:03 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Richard Weinberger <richard@....at>
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

On Tue 24-04-18 21:03:43, Richard Weinberger wrote:
> Am Dienstag, 24. April 2018, 18:27:12 CEST schrieb Michal Hocko:
> > fs/ubifs/debug.c
> 
> This one is just for debugging.
> So, preallocating + locking would not hurt much.
> 
> > fs/ubifs/lprops.c
> 
> Ditto.
> 
> > fs/ubifs/lpt_commit.c
> 
> Here we use it also only in debugging mode and in one case for
> fatal error reporting.
> No hot paths.
> 
> > fs/ubifs/orphan.c
> 
> Also only for debugging.
> Getting rid of vmalloc with GFP_NOFS in UBIFS is no big problem.
> I can prepare a patch.

Hi Richard, I have just got back to this and noticed that the vmalloc
NOFS usage is still there. Do you have any plans to push changes to
remove it?
-- 
Michal Hocko
SUSE Labs