From: David Rientjes <rientjes@google.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Turner <pjt@google.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Hugh Dickins <hughd@google.com>,
Andy Lutomirski <luto@amacapital.net>
Subject: Re: [patch] x86/vsyscall: Add Kconfig option to use native vsyscalls, switch to it
Date: Tue, 20 Nov 2012 16:43:26 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.00.1211201641550.6232@chino.kir.corp.google.com> (raw)
In-Reply-To: <20121120094132.GA15156@gmail.com>
On Tue, 20 Nov 2012, Ingo Molnar wrote:
> Subject: x86/vsyscall: Add Kconfig option to use native vsyscalls, switch to it
> From: Ingo Molnar <mingo@kernel.org>
>
> Apparently there's still plenty of systems out there triggering
> the vsyscall emulation page faults - causing hard to track down
> performance regressions on page fault intense workloads...
>
> Some people seem to have run into that with threading-intense
> Java workloads.
>
> So until there's a better solution to this, add a Kconfig switch
> to make the vsyscall mode configurable and turn native vsyscall
> support back on by default.
>
> Distributions whose libraries and applications use the vDSO and never
> access the vsyscall page can change the config option to off.
>
> Note, I don't think we want to expose the "none" option via a Kconfig
> switch - it breaks the ABI. So it's "native" versus "emulate", with
> "none" being available as a kernel boot option, for the super paranoid.
>
> For more background, see these upstream commits:
>
> 3ae36655b97a x86-64: Rework vsyscall emulation and add vsyscall= parameter
> 5cec93c216db x86-64: Emulate legacy vsyscalls
>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
It's slightly better, not sure if it's worth changing everybody's default
for the small speedup here, though.
THP enabled:
numa/core at ec05a2311c35: 136918.34 SPECjbb2005 bops
numa/core at 01aa90068b12: 128315.19 SPECjbb2005 bops (-6.3%)
numa/core at 01aa90068b12 + patch: 128589.34 SPECjbb2005 bops (-6.1%)
THP disabled:
numa/core at ec05a2311c35: 122246.90 SPECjbb2005 bops
numa/core at 01aa90068b12: 99389.49 SPECjbb2005 bops (-18.7%)
numa/core at 01aa90068b12 + patch: 100726.34 SPECjbb2005 bops (-17.6%)
perf top w/ THP enabled:
92.56% perf-13343.map [.] 0x00007fd513d2ba7a
1.24% libjvm.so [.] instanceKlass::oop_push_contents(PSPromoti
1.01% libjvm.so [.] PSPromotionManager::drain_stacks_depth(boo
0.77% libjvm.so [.] PSPromotionManager::copy_to_survivor_space
0.57% libjvm.so [.] PSPromotionManager::claim_or_forward_inter
0.26% libjvm.so [.] Copy::pd_disjoint_words(HeapWord*, HeapWord*, unsi
0.22% libjvm.so [.] CardTableExtension::scavenge_contents_parallel(Obj
0.20% [kernel] [k] read_tsc
0.15% [kernel] [k] _raw_spin_lock
0.13% [kernel] [k] getnstimeofday
0.12% [kernel] [k] page_fault
0.11% [kernel] [k] generic_smp_call_function_interrupt
0.10% [kernel] [k] ktime_get
0.10% [kernel] [k] rcu_check_callbacks
0.09% [kernel] [k] ktime_get_update_offsets
0.09% libjvm.so [.] objArrayKlass::oop_push_contents(PSPromotionManage
0.08% [kernel] [k] flush_tlb_func
0.07% [kernel] [k] system_call
0.07% libjvm.so [.] oopDesc::size_given_klass(Klass*)
0.06% [kernel] [k] handle_mm_fault
0.06% [kernel] [k] task_tick_fair
0.05% libc-2.3.6.so [.] __gettimeofday
0.05% libjvm.so [.] os::javaTimeMillis()
0.05% [kernel] [k] handle_pte_fault
0.05% [kernel] [k] system_call_after_swapgs
0.04% [kernel] [k] mpol_misplaced
0.04% [kernel] [k] __do_page_fault
0.04% perf [.] 0x0000000000035903
0.04% [kernel] [k] copy_user_generic_string
0.04% [kernel] [k] task_numa_fault
0.04% [acpi_cpufreq] [.] 0x000000005f51a009
0.04% [kernel] [k] find_vma
0.04% [kernel] [k] run_timer_softirq
0.03% [kernel] [k] sysret_check
0.03% [kernel] [k] smp_call_function_many
0.03% [kernel] [k] update_cfs_shares
0.02% [kernel] [k] do_wp_page
0.02% [kernel] [k] get_vma_policy
0.02% [kernel] [k] update_curr
0.02% [kernel] [k] down_read_trylock
0.02% [kernel] [k] apic_timer_interrupt
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next prev parent reply other threads:[~2012-11-21 0:43 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-19 2:14 [PATCH 00/27] Latest numa/core release, v16 Ingo Molnar
2012-11-19 2:14 ` [PATCH 01/27] mm/generic: Only flush the local TLB in ptep_set_access_flags() Ingo Molnar
2012-11-19 2:14 ` [PATCH 02/27] x86/mm: Only do a local tlb flush " Ingo Molnar
2012-11-19 2:14 ` [PATCH 03/27] x86/mm: Introduce pte_accessible() Ingo Molnar
2012-11-19 2:14 ` [PATCH 04/27] mm: Only flush the TLB when clearing an accessible pte Ingo Molnar
2012-11-19 2:14 ` [PATCH 05/27] x86/mm: Completely drop the TLB flush from ptep_set_access_flags() Ingo Molnar
2012-11-19 2:14 ` [PATCH 06/27] mm: Count the number of pages affected in change_protection() Ingo Molnar
2012-11-19 2:14 ` [PATCH 07/27] mm: Optimize the TLB flush of sys_mprotect() and change_protection() users Ingo Molnar
2012-11-19 2:14 ` [PATCH 08/27] sched, numa, mm: Add last_cpu to page flags Ingo Molnar
2012-11-19 2:14 ` [PATCH 09/27] sched, mm, numa: Create generic NUMA fault infrastructure, with architectures overrides Ingo Molnar
2012-11-19 2:14 ` [PATCH 10/27] sched: Make find_busiest_queue() a method Ingo Molnar
2012-11-19 2:14 ` [PATCH 11/27] sched, numa, mm: Describe the NUMA scheduling problem formally Ingo Molnar
2012-11-19 2:14 ` [PATCH 12/27] numa, mm: Support NUMA hinting page faults from gup/gup_fast Ingo Molnar
2012-11-19 2:14 ` [PATCH 13/27] mm/migrate: Introduce migrate_misplaced_page() Ingo Molnar
2012-11-19 2:14 ` [PATCH 14/27] sched, numa, mm, arch: Add variable locality exception Ingo Molnar
2012-11-19 2:14 ` [PATCH 15/27] sched, numa, mm: Add credits for NUMA placement Ingo Molnar
2012-11-19 2:14 ` [PATCH 16/27] sched, mm, x86: Add the ARCH_SUPPORTS_NUMA_BALANCING flag Ingo Molnar
2012-11-19 2:14 ` [PATCH 17/27] sched, numa, mm: Add the scanning page fault machinery Ingo Molnar
2012-11-19 2:14 ` [PATCH 18/27] sched: Add adaptive NUMA affinity support Ingo Molnar
2012-11-19 2:14 ` [PATCH 19/27] sched: Implement constant, per task Working Set Sampling (WSS) rate Ingo Molnar
2012-11-19 2:14 ` [PATCH 20/27] sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges Ingo Molnar
2012-11-19 2:14 ` [PATCH 21/27] sched: Implement slow start for working set sampling Ingo Molnar
2012-11-19 2:14 ` [PATCH 22/27] sched, numa, mm: Interleave shared tasks Ingo Molnar
2012-11-19 2:14 ` [PATCH 23/27] sched: Implement NUMA scanning backoff Ingo Molnar
2012-11-19 2:14 ` [PATCH 24/27] sched: Improve convergence Ingo Molnar
2012-11-19 2:14 ` [PATCH 25/27] sched: Introduce staged average NUMA faults Ingo Molnar
2012-11-19 2:14 ` [PATCH 26/27] sched: Track groups of shared tasks Ingo Molnar
2012-11-19 2:14 ` [PATCH 27/27] sched: Use the best-buddy 'ideal cpu' in balancing decisions Ingo Molnar
2012-11-19 16:29 ` [PATCH 00/27] Latest numa/core release, v16 Mel Gorman
2012-11-19 19:13 ` Ingo Molnar
2012-11-19 21:18 ` Mel Gorman
2012-11-19 22:36 ` Ingo Molnar
2012-11-19 23:00 ` Mel Gorman
2012-11-20 0:41 ` Rik van Riel
2012-11-21 10:58 ` Mel Gorman
2012-11-20 1:02 ` Linus Torvalds
2012-11-20 7:17 ` Ingo Molnar
2012-11-20 7:37 ` David Rientjes
2012-11-20 7:48 ` Ingo Molnar
2012-11-20 8:01 ` Ingo Molnar
2012-11-20 8:11 ` David Rientjes
2012-11-21 11:14 ` Mel Gorman
2012-11-20 10:20 ` Mel Gorman
2012-11-20 10:47 ` Mel Gorman
2012-11-20 15:29 ` [PATCH] mm, numa: Turn 4K pte NUMA faults into effective hugepage ones Ingo Molnar
2012-11-20 16:09 ` [PATCH, v2] " Ingo Molnar
2012-11-20 16:31 ` Rik van Riel
2012-11-20 16:52 ` Ingo Molnar
2012-11-21 12:08 ` Mel Gorman
2012-11-21 8:12 ` Ingo Molnar
2012-11-21 2:41 ` David Rientjes
2012-11-21 9:34 ` Ingo Molnar
2012-11-21 11:40 ` Mel Gorman
2012-11-23 1:26 ` Alex Shi
2012-11-20 17:56 ` numa/core regressions fixed - more testers wanted Ingo Molnar
2012-11-21 1:54 ` Andrew Theurer
2012-11-21 3:22 ` Rik van Riel
2012-11-21 4:10 ` Hugh Dickins
2012-11-21 17:59 ` Andrew Theurer
2012-11-21 11:52 ` Mel Gorman
2012-11-21 22:15 ` Andrew Theurer
2012-11-21 3:33 ` David Rientjes
2012-11-21 9:38 ` Ingo Molnar
2012-11-21 11:06 ` Ingo Molnar
2012-11-21 8:39 ` Alex Shi
2012-11-22 1:21 ` Ingo Molnar
2012-11-23 13:31 ` Ingo Molnar
2012-11-23 15:23 ` Alex Shi
2012-11-26 2:11 ` Alex Shi
2012-11-28 14:21 ` Alex Shi
2012-11-20 10:40 ` [PATCH 00/27] Latest numa/core release, v16 Ingo Molnar
2012-11-20 11:40 ` Mel Gorman
2012-11-21 10:38 ` Mel Gorman
2012-11-21 19:37 ` Andrea Arcangeli
2012-11-21 19:56 ` Mel Gorman
2012-11-19 20:07 ` Ingo Molnar
2012-11-19 21:37 ` Mel Gorman
2012-11-20 0:50 ` David Rientjes
2012-11-20 1:05 ` David Rientjes
2012-11-20 6:00 ` Ingo Molnar
2012-11-20 6:20 ` David Rientjes
2012-11-20 7:44 ` Ingo Molnar
2012-11-20 7:48 ` Paul Turner
2012-11-20 8:20 ` David Rientjes
2012-11-20 9:06 ` Ingo Molnar
2012-11-20 9:41 ` [patch] x86/vsyscall: Add Kconfig option to use native vsyscalls, switch to it Ingo Molnar
2012-11-20 23:01 ` Andy Lutomirski
2012-11-21 0:43 ` David Rientjes [this message]
2012-11-20 12:02 ` [PATCH] x86/mm: Don't flush the TLB on #WP pmd fixups Ingo Molnar
2012-11-20 12:31 ` Ingo Molnar
2012-11-21 11:47 ` Mel Gorman
2012-11-21 1:22 ` David Rientjes
2012-11-21 17:02 ` [PATCH 00/27] Latest numa/core release, v16 Linus Torvalds
2012-11-21 17:10 ` Ingo Molnar
2012-11-21 17:20 ` Ingo Molnar
2012-11-22 4:31 ` David Rientjes
2012-11-21 17:40 ` Ingo Molnar
2012-11-21 22:04 ` Linus Torvalds
2012-11-21 22:46 ` Ingo Molnar
2012-11-21 17:45 ` Rik van Riel
2012-11-21 18:04 ` Ingo Molnar
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