From: Chris Metcalf <cmetcalf@ezchip.com>
To: Paul Gortmaker <paul.gortmaker@windriver.com>,
Eric B Munson <emunson@akamai.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.cz>, Vlastimil Babka <vbabka@suse.cz>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, linux-arch <linux-arch@vger.kernel.org>,
linux-api@vger.kernel.org,
"linux-next@vger.kernel.org" <linux-next@vger.kernel.org>
Subject: Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT
Date: Mon, 20 Jul 2015 16:40:25 -0400 [thread overview]
Message-ID: <55AD5CB9.4090400@ezchip.com> (raw)
In-Reply-To: <CAP=VYLq5=9DCfncJpQizcSbQt1O7VL2yEdzZNOFK+M3pqLpb3Q@mail.gmail.com>
On 07/18/2015 03:11 PM, Paul Gortmaker wrote:
> On Tue, Jul 7, 2015 at 1:03 PM, Eric B Munson<emunson@akamai.com> wrote:
>> >The cost of faulting in all memory to be locked can be very high when
>> >working with large mappings. If only portions of the mapping will be
>> >used this can incur a high penalty for locking.
>> >
>> >Now that we have the new VMA flag for the locked but not present state,
>> >expose it as an mmap option like MAP_LOCKED -> VM_LOCKED.
> An automatic bisection on arch/tile leads to this commit:
>
> 5a5656f2c9b61c74c15f9ef3fa2e6513b6c237bb is the first bad commit
> commit 5a5656f2c9b61c74c15f9ef3fa2e6513b6c237bb
> Author: Eric B Munson<emunson@akamai.com>
> Date: Thu Jul 16 10:09:22 2015 +1000
>
> mm: mmap: add mmap flag to request VM_LOCKONFAULT
Eric, I'm happy to help with figuring out the tile issues.
--
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com
next prev parent reply other threads:[~2015-07-20 20:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-07 17:03 [PATCH V3 0/5] Allow user to request memory to be locked on page fault Eric B Munson
2015-07-07 17:03 ` [PATCH V3 2/5] mm: mlock: Add new mlock, munlock, and munlockall system calls Eric B Munson
2015-07-08 6:46 ` Heiko Carstens
2015-07-08 7:02 ` Geert Uytterhoeven
[not found] ` <1436288623-13007-3-git-send-email-emunson-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org>
2015-07-08 11:06 ` Catalin Marinas
2015-07-07 17:03 ` [PATCH V3 3/5] mm: mlock: Introduce VM_LOCKONFAULT and add mlock flags to enable it Eric B Munson
2015-07-08 19:23 ` Jonathan Corbet
2015-07-08 20:34 ` Eric B Munson
2015-07-08 21:17 ` Jonathan Corbet
2015-07-09 18:46 ` Eric B Munson
2015-07-10 16:11 ` Jonathan Corbet
[not found] ` <20150710101118.5d04d627-T1hC0tSOHrs@public.gmane.org>
2015-07-10 16:19 ` Eric B Munson
2015-07-21 15:35 ` Vlastimil Babka
2015-07-07 17:03 ` [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT Eric B Munson
2015-07-18 19:11 ` Paul Gortmaker
2015-07-20 20:40 ` Chris Metcalf [this message]
2015-07-21 15:37 ` Eric B Munson
2015-07-22 14:10 ` Paul Gortmaker
[not found] ` <1436288623-13007-1-git-send-email-emunson-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org>
2015-07-07 17:03 ` [PATCH V3 5/5] selftests: vm: Add tests for lock on fault Eric B Munson
[not found] ` <1436288623-13007-6-git-send-email-emunson-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org>
2015-07-07 21:51 ` Andrew Morton
2015-07-07 21:16 ` [PATCH V3 0/5] Allow user to request memory to be locked on page fault Andrew Morton
2015-07-08 13:23 ` Eric B Munson
2015-07-08 17:00 ` Andrew Morton
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