linux-kernel - Re: mlockall(MCL_CURRENT) blocking infinitely

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Message-ID: <20191106172520.GF12685@quack2.suse.cz>
Date:   Wed, 6 Nov 2019 18:25:20 +0100
From:   Jan Kara <jack@...e.cz>
To:     snazy@...zy.de
Cc:     Josef Bacik <josef@...icpanda.com>, Jan Kara <jack@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Potyra, Stefan" <Stefan.Potyra@...ktrobit.com>
Subject: Re: mlockall(MCL_CURRENT) blocking infinitely

On Wed 06-11-19 18:03:10, Robert Stupp wrote:
> Oh, and I just realized, that I have two custom settings in my
> /etc/rc.local - guess, I configured that when I installed that machine
> years ago. Sorry, that I haven't mentioned that earlier.
> 
> echo 0 > /sys/block/nvme0n1/queue/read_ahead_kb
> echo never >
> /sys/kernel/mm/transparent_hugepage/defrag
> 
> That setting is probably not quite standard, but I assume there are
> some database server setups out there, that set RA=0 as well.

Ok, yes, that explains ra_pages == 0. Thanks for the details.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR