* Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT [not found] ` <1436288623-13007-5-git-send-email-emunson@akamai.com> @ 2015-07-18 19:11 ` Paul Gortmaker 2015-07-20 20:40 ` Chris Metcalf 0 siblings, 1 reply; 4+ messages in thread From: Paul Gortmaker @ 2015-07-18 19:11 UTC (permalink / raw) To: Eric B Munson Cc: Andrew Morton, Michal Hocko, Vlastimil Babka, LKML, linux-mm, linux-arch, linux-api, cmetcalf, linux-next@vger.kernel.org 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 Fails with: In file included from arch/tile/mm/init.c:24: include/linux/mman.h: In function ‘calc_vm_flag_bits’: include/linux/mman.h:90: error: ‘MAP_LOCKONFAULT’ undeclared (first use in this function) include/linux/mman.h:90: error: (Each undeclared identifier is reported only once include/linux/mman.h:90: error: for each function it appears in.) In file included from arch/tile/mm/mmap.c:21: include/linux/mman.h: In function ‘calc_vm_flag_bits’: include/linux/mman.h:90: error: ‘MAP_LOCKONFAULT’ undeclared (first use in this function) include/linux/mman.h:90: error: (Each undeclared identifier is reported only once include/linux/mman.h:90: error: for each function it appears in.) In file included from arch/tile/mm/fault.c:24: include/linux/mman.h: In function ‘calc_vm_flag_bits’: include/linux/mman.h:90: error: ‘MAP_LOCKONFAULT’ undeclared (first use in this function) include/linux/mman.h:90: error: (Each undeclared identifier is reported only once include/linux/mman.h:90: error: for each function it appears in.) In file included from arch/tile/mm/hugetlbpage.c:27: include/linux/mman.h: In function ‘calc_vm_flag_bits’: include/linux/mman.h:90: error: ‘MAP_LOCKONFAULT’ undeclared (first use in this function) include/linux/mman.h:90: error: (Each undeclared identifier is reported only once include/linux/mman.h:90: error: for each function it appears in.) make[1]: *** [arch/tile/mm/hugetlbpage.o] Error 1 http://kisskb.ellerman.id.au/kisskb/buildresult/12465365/ Paul. -- ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT 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 0 siblings, 1 reply; 4+ messages in thread From: Chris Metcalf @ 2015-07-20 20:40 UTC (permalink / raw) To: Paul Gortmaker, Eric B Munson Cc: Andrew Morton, Michal Hocko, Vlastimil Babka, LKML, linux-mm, linux-arch, linux-api, linux-next@vger.kernel.org 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. -- Chris Metcalf, EZChip Semiconductor http://www.ezchip.com ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT 2015-07-20 20:40 ` Chris Metcalf @ 2015-07-21 15:37 ` Eric B Munson 2015-07-22 14:10 ` Paul Gortmaker 0 siblings, 1 reply; 4+ messages in thread From: Eric B Munson @ 2015-07-21 15:37 UTC (permalink / raw) To: Chris Metcalf Cc: Paul Gortmaker, Andrew Morton, Michal Hocko, Vlastimil Babka, LKML, linux-mm, linux-arch, linux-api, linux-next@vger.kernel.org [-- Attachment #1: Type: text/plain, Size: 1051 bytes --] 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 [-- Attachment #2: Digital signature --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH V3 4/5] mm: mmap: Add mmap flag to request VM_LOCKONFAULT 2015-07-21 15:37 ` Eric B Munson @ 2015-07-22 14:10 ` Paul Gortmaker 0 siblings, 0 replies; 4+ messages in thread From: Paul Gortmaker @ 2015-07-22 14:10 UTC (permalink / raw) To: Eric B Munson Cc: Chris Metcalf, Andrew Morton, Michal Hocko, Vlastimil Babka, LKML, linux-mm, linux-arch, linux-api, linux-next@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<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 > -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 4+ messages in thread
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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
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