linux-kernel - Re: [PATCH 4/4] mtd: nand: nandsim: convert to memalloc_noreclaim

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Message-ID: <ee6649ed-b0e8-1c59-c193-d1688fdfe7f5@nod.at>
Date:   Wed, 5 Apr 2017 13:36:22 +0200
From:   Richard Weinberger <richard@....at>
To:     Michal Hocko <mhocko@...nel.org>, Vlastimil Babka <vbabka@...e.cz>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Mel Gorman <mgorman@...hsingularity.net>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-block@...r.kernel.org, nbd-general@...ts.sourceforge.net,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 4/4] mtd: nand: nandsim: convert to memalloc_noreclaim_*()

Michal,

Am 05.04.2017 um 13:31 schrieb Michal Hocko:
> On Wed 05-04-17 09:47:00, Vlastimil Babka wrote:
>> Nandsim has own functions set_memalloc() and clear_memalloc() for robust
>> setting and clearing of PF_MEMALLOC. Replace them by the new generic helpers.
>> No functional change.
> 
> This one smells like an abuser. Why the hell should read/write path
> touch memory reserves at all!

Could be. Let's ask Adrian, AFAIK he wrote that code.
Adrian, can you please clarify why nandsim needs to play with PF_MEMALLOC?

Thanks,
//richard