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

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Message-ID: <20191025132700.GJ17610@dhcp22.suse.cz>
Date:   Fri, 25 Oct 2019 15:27:00 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     snazy@...zy.de
Cc:     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 Fri 25-10-19 15:10:39, Robert Stupp wrote:
[...]
> cat /proc/$(pidof test)/smaps

Nothing really unusual that would jump at me except for
> 7f8be90ed000-7f8be9265000 r-xp 00025000 103:02
> 44307431                  /lib/x86_64-linux-gnu/libc-2.30.so
> Size:               1504 kB
> KernelPageSize:        4 kB
> MMUPageSize:           4 kB
> Rss:                 832 kB
> Pss:                   5 kB
> Shared_Clean:        832 kB
> Shared_Dirty:          0 kB
> Private_Clean:         0 kB
> Private_Dirty:         0 kB
> Referenced:          832 kB
> Anonymous:             0 kB
> LazyFree:              0 kB
> AnonHugePages:         0 kB
> ShmemPmdMapped:        0 kB
> Shared_Hugetlb:        0 kB
> Private_Hugetlb:       0 kB
> Swap:                  0 kB
> SwapPss:               0 kB
> Locked:                5 kB

Huh, 5kB, is this really the case or some copy&paste error?
How can we end up with !pagesize multiple here?

> THPeligible:		0
> VmFlags: rd ex mr mw me lo sd
-- 
Michal Hocko
SUSE Labs