From: Paul Gortmaker <paul.gortmaker@windriver•com>
To: Eric B Munson <emunson@akamai•com>
Cc: Chris Metcalf <cmetcalf@ezchip•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: Wed, 22 Jul 2015 10:10:20 -0400 [thread overview]
Message-ID: <55AFA44C.2060906@windriver.com> (raw)
In-Reply-To: <20150721153722.GB5411@akamai.com>
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@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).
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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prev parent reply other threads:[~2015-07-22 14:10 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
2015-07-22 14:10 ` Paul Gortmaker [this message]
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