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

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Date:	Wed, 22 Jul 2015 10:10:20 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Eric B Munson <emunson@...mai.com>
CC:	Chris Metcalf <cmetcalf@...hip.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 2015-07-21 11:37 AM, Eric B Munson wrote:
> 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).

Not quite sorted yet.  Seems parisc fails on v4.  It updated the
number of syscalls but did not update syscall_table.S causing:

arch/parisc/kernel/syscall_table.S:444: Error: size of syscall table does not fit value of __NR_Linux_syscalls

http://kisskb.ellerman.id.au/kisskb/buildresult/12468884/

Paul.
--

> Eric
> 
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