From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Gortmaker Subject: Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT Date: Wed, 22 Jul 2015 10:10:20 -0400 Message-ID: <55AFA44C.2060906@windriver.com> References: <1436288623-13007-1-git-send-email-emunson@akamai.com> <1436288623-13007-5-git-send-email-emunson@akamai.com> <55AD5CB9.4090400@ezchip.com> <20150721153722.GB5411@akamai.com> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150721153722.GB5411@akamai.com> Sender: owner-linux-mm@kvack.org To: Eric B Munson Cc: Chris Metcalf , Andrew Morton , Michal Hocko , Vlastimil Babka , LKML , linux-mm@kvack.org, linux-arch , linux-api@vger.kernel.org, "linux-next@vger.kernel.org" List-Id: linux-api@vger.kernel.org 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 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 >>> 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 > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org