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SubjectRe: [LKP] [patch v2 for-4.20] mm, thp: restore node-local hugepage allocations
On Wed, Dec 05, 2018 at 02:46:50PM -0800, David Rientjes wrote:
> This is a full revert of ac5b2c18911f ("mm: thp: relax __GFP_THISNODE for
> MADV_HUGEPAGE mappings") and a partial revert of 89c83fb539f9 ("mm, thp:
> consolidate THP gfp handling into alloc_hugepage_direct_gfpmask").
>
> By not setting __GFP_THISNODE, applications can allocate remote hugepages
> when the local node is fragmented or low on memory when either the thp
> defrag setting is "always" or the vma has been madvised with
> MADV_HUGEPAGE.
>
> Remote access to hugepages often has much higher latency than local pages
> of the native page size. On Haswell, ac5b2c18911f was shown to have a
> 13.9% access regression after this commit for binaries that remap their
> text segment to be backed by transparent hugepages.
>
> The intent of ac5b2c18911f is to address an issue where a local node is
> low on memory or fragmented such that a hugepage cannot be allocated. In
> every scenario where this was described as a fix, there is abundant and
> unfragmented remote memory available to allocate from, even with a greater
> access latency.
>
> If remote memory is also low or fragmented, not setting __GFP_THISNODE was
> also measured on Haswell to have a 40% regression in allocation latency.
>
> Restore __GFP_THISNODE for thp allocations.
>
> Fixes: ac5b2c18911f ("mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings")
> Fixes: 89c83fb539f9 ("mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask")
> Signed-off-by: David Rientjes <rientjes@google.com>
> ---
> include/linux/mempolicy.h | 2 --
> mm/huge_memory.c | 42 +++++++++++++++------------------------
> mm/mempolicy.c | 2 +-
> 3 files changed, 17 insertions(+), 29 deletions(-)
>
> diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
> --- a/include/linux/mempolicy.h
> +++ b/include/linux/mempolicy.h
> @@ -139,8 +139,6 @@ struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
> struct mempolicy *get_task_policy(struct task_struct *p);
> struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
> unsigned long addr);
> -struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
> - unsigned long addr);
> bool vma_policy_mof(struct vm_area_struct *vma);
>
> extern void numa_default_policy(void);
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -632,37 +632,27 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
> static inline gfp_t alloc_hugepage_direct_gfpmask(struct vm_area_struct *vma, unsigned long addr)
> {
> const bool vma_madvised = !!(vma->vm_flags & VM_HUGEPAGE);
> - gfp_t this_node = 0;
> -
> -#ifdef CONFIG_NUMA
> - struct mempolicy *pol;
> - /*
> - * __GFP_THISNODE is used only when __GFP_DIRECT_RECLAIM is not
> - * specified, to express a general desire to stay on the current
> - * node for optimistic allocation attempts. If the defrag mode
> - * and/or madvise hint requires the direct reclaim then we prefer
> - * to fallback to other node rather than node reclaim because that
> - * can lead to excessive reclaim even though there is free memory
> - * on other nodes. We expect that NUMA preferences are specified
> - * by memory policies.
> - */
> - pol = get_vma_policy(vma, addr);
> - if (pol->mode != MPOL_BIND)
> - this_node = __GFP_THISNODE;
> - mpol_cond_put(pol);
> -#endif
> + const gfp_t gfp_mask = GFP_TRANSHUGE_LIGHT | __GFP_THISNODE;
>
> + /* Always do synchronous compaction */
> if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags))
> - return GFP_TRANSHUGE | (vma_madvised ? 0 : __GFP_NORETRY);
> + return GFP_TRANSHUGE | __GFP_THISNODE |
> + (vma_madvised ? 0 : __GFP_NORETRY);
> +
> + /* Kick kcompactd and fail quickly */
> if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags))
> - return GFP_TRANSHUGE_LIGHT | __GFP_KSWAPD_RECLAIM | this_node;
> + return gfp_mask | __GFP_KSWAPD_RECLAIM;
> +
> + /* Synchronous compaction if madvised, otherwise kick kcompactd */
> if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags))
> - return GFP_TRANSHUGE_LIGHT | (vma_madvised ? __GFP_DIRECT_RECLAIM :
> - __GFP_KSWAPD_RECLAIM | this_node);
> + return gfp_mask | (vma_madvised ? __GFP_DIRECT_RECLAIM :
> + __GFP_KSWAPD_RECLAIM);
> +
> + /* Only do synchronous compaction if madvised */
> if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags))
> - return GFP_TRANSHUGE_LIGHT | (vma_madvised ? __GFP_DIRECT_RECLAIM :
> - this_node);
> - return GFP_TRANSHUGE_LIGHT | this_node;
> + return gfp_mask | (vma_madvised ? __GFP_DIRECT_RECLAIM : 0);
> +
> + return gfp_mask;
> }
>
> /* Caller must hold page table lock. */
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -1662,7 +1662,7 @@ struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
> * freeing by another task. It is the caller's responsibility to free the
> * extra reference for shared policies.
> */
> -struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
> +static struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
> unsigned long addr)
> {
> struct mempolicy *pol = __get_vma_policy(vma, addr);
> _______________________________________________
> LKP mailing list
> LKP@lists.01.org
> https://lists.01.org/mailman/listinfo/lkp

Hi,

FYI, we noticed no regression of vm-scalability.throughput between the two commits.

tests: 1
testcase/path_params/tbox_group/run: vm-scalability/300-always-always-32-1-swap-w-seq-ucode=0x3d-performance/lkp-hsw-ep4

commit:
94e297c50b ("include/linux/notifier.h: SRCU: fix ctags")
2f0799a0ff ("mm, thp: restore node-local hugepage allocations")

94e297c50b529f5d 2f0799a0ffc033bf3cc82d5032
---------------- --------------------------
%stddev change %stddev
\ | \
425945 ± 9% 36% 578453 ± 18% vm-scalability.time.minor_page_faults
322 313 vm-scalability.time.user_time
905482 ± 5% 20% 1087102 ± 9% perf-stat.page-faults
901474 ± 5% 20% 1081707 ± 9% perf-stat.minor-faults
425945 ± 9% 36% 578453 ± 18% time.minor_page_faults
322 313 time.user_time
6792 ± 5% -10% 6097 vmstat.system.cs
1625177 ± 4% -11% 1446045 vmstat.swap.so
1625189 ± 4% -11% 1446055 vmstat.io.bo
171516 ± 5% -24% 131111 ± 24% vmstat.system.in
157193 ± 15% 46% 230011 ± 20% proc-vmstat.pgactivate
559397 ± 8% 45% 809533 ± 12% proc-vmstat.pgscan_direct
207042 ± 8% 43% 295574 ± 10% proc-vmstat.pgsteal_direct
5852284 ± 12% 42% 8294341 ± 20% proc-vmstat.slabs_scanned
211428 ± 6% 39% 293175 ± 6% proc-vmstat.pgrefill
135763 ± 9% 39% 188155 ± 3% proc-vmstat.nr_vmscan_write
220023 ± 5% 38% 303404 ± 6% proc-vmstat.nr_written
219051 ± 5% 38% 301549 ± 6% proc-vmstat.pgrotated
1018 ± 10% 36% 1383 ± 4% proc-vmstat.nr_zone_write_pending
1017 ± 10% 36% 1379 ± 4% proc-vmstat.nr_writeback
919059 ± 4% 20% 1102507 ± 9% proc-vmstat.pgfault
1108142 ± 9% 16% 1285859 ± 5% proc-vmstat.numa_local
1122389 ± 9% 16% 1302063 ± 5% proc-vmstat.numa_hit
715724 -5% 682381 ± 4% proc-vmstat.nr_file_pages
5784 ± 6% -5% 5482 ± 7% proc-vmstat.nr_mapped
266928 -16% 223157 proc-vmstat.nr_zone_unevictable
266928 -16% 223157 proc-vmstat.nr_unevictable
0 4e+05 428930 ±139% latency_stats.avg.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled._copy_to_user.do_syslog.kmsg_read
11973 ± 70% 3e+05 298302 ± 83% latency_stats.avg.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_enhanced_fast_string._copy_to_user.do_syslog.kmsg_read
17650 ± 35% 2e+05 265410 ± 84% latency_stats.avg.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.strnlen_user.copy_strings.__do_execve_file.__x64_sys_execve
9801 ± 42% 5e+04 61121 ±112% latency_stats.avg.io_schedule.__lock_page.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__get_user_pages.get_user_pages_remote.__access_remote_vm.proc_pid_cmdline_read.__vfs_read.vfs_read
0 3e+04 25998 ±141% latency_stats.avg.rpc_wait_bit_killable.__rpc_execute.rpc_run_task.rpc_call_sync.nfs3_rpc_wrapper.nfs3_do_create.nfs3_proc_create.nfs_create.path_openat.do_filp_open.do_sys_open.do_syscall_64
0 6e+03 6202 ±141% latency_stats.avg.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.read_swap_cache_async.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_fault
0 5e+03 5457 ±141% latency_stats.avg.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.swapin_readahead.do_swap_page.__handle_mm_fault.handle_mm_fault.__get_user_pages
4585 ±173% -5e+03 0 latency_stats.avg.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_fault.__do_fault
6229 ±173% -6e+03 0 latency_stats.avg.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.read_swap_cache_async.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_write_begin
37391 ±173% -4e+04 0 latency_stats.avg.io_schedule.wait_on_page_bit.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
52525 ±100% -5e+04 0 latency_stats.avg.msleep.shrink_inactive_list.shrink_node_memcg.shrink_node.do_try_to_free_pages.try_to_free_pages.__alloc_pages_slowpath.__alloc_pages_nodemask.do_huge_pmd_anonymous_page.__handle_mm_fault.handle_mm_fault.__do_page_fault
141825 ±172% -1e+05 590 ±126% latency_stats.avg.io_schedule.__lock_page.shmem_getpage_gfp.shmem_file_read_iter.__vfs_read.vfs_read.ksys_read.do_syscall_64.entry_SYSCALL_64_after_hwframe
240110 ±124% -2e+05 2543 ±141% latency_stats.avg.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled._copy_to_user.perf_read.__vfs_read
272115 ±171% -3e+05 6043 ± 71% latency_stats.avg.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled.core_sys_select.kern_select.__x64_sys_select
538363 ± 77% -4e+05 136003 ± 68% latency_stats.avg.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_enhanced_fast_string.copyout._copy_to_iter.skb_copy_datagram_iter
23857 ± 26% 1e+06 1035782 ± 71% latency_stats.max.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.strnlen_user.copy_strings.__do_execve_file.__x64_sys_execve
11973 ± 70% 8e+05 778555 ± 70% latency_stats.max.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_enhanced_fast_string._copy_to_user.do_syslog.kmsg_read
0 4e+05 428930 ±139% latency_stats.max.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled._copy_to_user.do_syslog.kmsg_read
0 3e+04 25998 ±141% latency_stats.max.rpc_wait_bit_killable.__rpc_execute.rpc_run_task.rpc_call_sync.nfs3_rpc_wrapper.nfs3_do_create.nfs3_proc_create.nfs_create.path_openat.do_filp_open.do_sys_open.do_syscall_64
0 8e+03 7916 ±141% latency_stats.max.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.read_swap_cache_async.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_fault
0 7e+03 6751 ±141% latency_stats.max.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.swapin_readahead.do_swap_page.__handle_mm_fault.handle_mm_fault.__get_user_pages
4585 ±173% -5e+03 0 latency_stats.max.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_fault.__do_fault
6229 ±173% -6e+03 0 latency_stats.max.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.read_swap_cache_async.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_write_begin
7425 ±117% -7e+03 68 ± 7% latency_stats.max.smp_call_on_cpu.lockup_detector_reconfigure.proc_watchdog_common.proc_sys_call_handler.__vfs_write.vfs_write.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe
52680 ±100% -5e+04 0 latency_stats.max.msleep.shrink_inactive_list.shrink_node_memcg.shrink_node.do_try_to_free_pages.try_to_free_pages.__alloc_pages_slowpath.__alloc_pages_nodemask.do_huge_pmd_anonymous_page.__handle_mm_fault.handle_mm_fault.__do_page_fault
107626 ±173% -1e+05 0 latency_stats.max.io_schedule.wait_on_page_bit.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
272938 ±170% -3e+05 16767 ± 71% latency_stats.max.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled.core_sys_select.kern_select.__x64_sys_select
284952 ±170% -3e+05 592 ±125% latency_stats.max.io_schedule.__lock_page.shmem_getpage_gfp.shmem_file_read_iter.__vfs_read.vfs_read.ksys_read.do_syscall_64.entry_SYSCALL_64_after_hwframe
357768 ±136% -4e+05 2543 ±141% latency_stats.max.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled._copy_to_user.perf_read.__vfs_read
1155510 ± 48% 9e+06 9751594 ±110% latency_stats.sum.io_schedule.__lock_page.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__get_user_pages.get_user_pages_remote.__access_remote_vm.proc_pid_cmdline_read.__vfs_read.vfs_read
4573026 ± 77% 8e+06 12847407 ±122% latency_stats.sum.io_schedule.wait_on_page_bit.shmem_getpage_gfp.shmem_write_begin.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.__vfs_write.vfs_write.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe
48641 ± 48% 2e+06 2342957 ± 71% latency_stats.sum.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.strnlen_user.copy_strings.__do_execve_file.__x64_sys_execve
11973 ± 70% 8e+05 788601 ± 70% latency_stats.sum.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_enhanced_fast_string._copy_to_user.do_syslog.kmsg_read
0 4e+05 428930 ±139% latency_stats.sum.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled._copy_to_user.do_syslog.kmsg_read
0 4e+04 38202 ±141% latency_stats.sum.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.swapin_readahead.do_swap_page.__handle_mm_fault.handle_mm_fault.__get_user_pages
0 3e+04 25998 ±141% latency_stats.sum.rpc_wait_bit_killable.__rpc_execute.rpc_run_task.rpc_call_sync.nfs3_rpc_wrapper.nfs3_do_create.nfs3_proc_create.nfs_create.path_openat.do_filp_open.do_sys_open.do_syscall_64
0 2e+04 18607 ±141% latency_stats.sum.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.read_swap_cache_async.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_fault
4585 ±173% -5e+03 0 latency_stats.sum.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_fault.__do_fault
8048 ± 99% -5e+03 3141 ± 60% latency_stats.sum.rpc_wait_bit_killable.__rpc_execute.rpc_run_task.rpc_call_sync.nfs3_rpc_wrapper.nfs3_proc_access.nfs_do_access.nfs_permission.inode_permission.link_path_walk.path_lookupat.filename_lookup
6229 ±173% -6e+03 0 latency_stats.sum.io_schedule.blk_mq_get_tag.blk_mq_get_request.blk_mq_make_request.generic_make_request.submit_bio.swap_readpage.read_swap_cache_async.swap_cluster_readahead.shmem_swapin.shmem_getpage_gfp.shmem_write_begin
10774 ± 82% -7e+03 3648 ± 5% latency_stats.sum.smp_call_on_cpu.lockup_detector_reconfigure.proc_watchdog_common.proc_sys_call_handler.__vfs_write.vfs_write.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe
112174 ±173% -1e+05 0 latency_stats.sum.io_schedule.wait_on_page_bit.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
157878 ±137% -2e+05 0 latency_stats.sum.msleep.shrink_inactive_list.shrink_node_memcg.shrink_node.do_try_to_free_pages.try_to_free_pages.__alloc_pages_slowpath.__alloc_pages_nodemask.do_huge_pmd_anonymous_page.__handle_mm_fault.handle_mm_fault.__do_page_fault
275908 ±168% -3e+05 18129 ± 71% latency_stats.sum.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled.core_sys_select.kern_select.__x64_sys_select
285059 ±170% -3e+05 633 ±113% latency_stats.sum.io_schedule.__lock_page.shmem_getpage_gfp.shmem_file_read_iter.__vfs_read.vfs_read.ksys_read.do_syscall_64.entry_SYSCALL_64_after_hwframe
427767 ±141% -4e+05 2543 ±141% latency_stats.sum.io_schedule.__lock_page_or_retry.do_swap_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault.copy_user_generic_unrolled._copy_to_user.perf_read.__vfs_read

Best Regards,
Rong Chen

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