From: Eric B Munson <emunson@akamai.com>
To: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>,
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: Tue, 21 Jul 2015 11:37:22 -0400 [thread overview]
Message-ID: <20150721153722.GB5411@akamai.com> (raw)
In-Reply-To: <55AD5CB9.4090400@ezchip.com>
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On Mon, 20 Jul 2015, Chris Metcalf wrote:
> 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.
Thanks for the offer, I think I have is sorted in V4 (which I am
checking one last time before I post).
Eric
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next prev parent reply other threads:[~2015-07-21 15:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1436288623-13007-1-git-send-email-emunson@akamai.com>
[not found] ` <1436288623-13007-5-git-send-email-emunson@akamai.com>
2015-07-18 19:11 ` [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT Paul Gortmaker
2015-07-20 20:40 ` Chris Metcalf
2015-07-21 15:37 ` Eric B Munson [this message]
2015-07-22 14:10 ` Paul Gortmaker
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