linux-kernel - Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM

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Message-ID: <20150721153722.GB5411@akamai.com>
Date:	Tue, 21 Jul 2015 11:37:22 -0400
From:	Eric B Munson <emunson@...mai.com>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Vlastimil Babka <vbabka@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	linux-arch <linux-arch@...r.kernel.org>,
	linux-api@...r.kernel.org,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>
Subject: Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT

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@...mai.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@...mai.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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