From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Luming Yu <luming.yu@gmail.com>
Cc: Nick Piggin <npiggin@gmail.com>, Alex Shi <alex.shi@intel.com>,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
arnd@arndb.de, rostedt@goodmis.org, fweisbec@gmail.com,
jeremy@goop.org, riel@redhat.com, luto@mit.edu, avi@redhat.com,
len.brown@intel.com, dhowells@redhat.com, fenghua.yu@intel.com,
borislav.petkov@amd.com, yinghai@kernel.org, ak@linux.intel.com,
cpw@sgi.com, steiner@sgi.com, akpm@linux-foundation.org,
penberg@kernel.org, hughd@google.com, rientjes@google.com,
kosaki.motohiro@jp.fujitsu.com, n-horiguchi@ah.jp.nec.com,
tj@kernel.org, oleg@redhat.com, axboe@kernel.dk,
jmorris@namei.org, kamezawa.hiroyu@jp.fujitsu.com,
viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org,
yongjie.ren@intel.com, linux-arch@vger.kernel.org,
jcm@jonmasters.org
Subject: Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm
Date: Tue, 15 May 2012 15:06:10 +0200 [thread overview]
Message-ID: <1337087170.27020.166.camel@laptop> (raw)
In-Reply-To: <CAJRGBZy0S_fg3GY4S5CG-2SWv5AG1jMrcMMqCiTg=7xyD1mrzQ@mail.gmail.com>
On Tue, 2012-05-15 at 20:58 +0800, Luming Yu wrote:
>
>
> Both __native_flush_tlb() and __native_flush_tlb_single(...)
> introduced roughly 1 ns latency to tsc sampling executed in
> stop_machine_context in two logical CPUs
But you have to weight that against the cost of re-population, and
that's the difficult bit, since we have no clue how many tlb entries are
in use by the current cr3.
It might be possible for intel to give us this information, I've asked
for something similar for cachelines.
next prev parent reply other threads:[~2012-05-15 13:06 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-15 8:55 [PATCH v5 0/7] tlb flush optimization for x86 Alex Shi
2012-05-15 8:55 ` [PATCH v5 1/7] x86/tlb: unify TLB_FLUSH_ALL definition Alex Shi
2012-05-15 8:55 ` [PATCH v5 2/7] x86/tlb_info: get last level TLB entry number of CPU Alex Shi
2012-05-15 8:55 ` [PATCH v5 3/7] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range Alex Shi
2012-05-15 8:55 ` [PATCH v5 4/7] x86/tlb: fall back to flush all when meet a THP large page Alex Shi
2012-05-15 8:55 ` [PATCH v5 5/7] x86/tlb: add tlb_flushall_shift for specific CPU Alex Shi
2012-05-16 6:49 ` Alex Shi
2012-05-16 17:55 ` H. Peter Anvin
2012-05-17 1:46 ` Alex Shi
2012-05-15 8:55 ` [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm Alex Shi
2012-05-15 9:11 ` Peter Zijlstra
2012-05-15 9:15 ` Nick Piggin
2012-05-15 9:17 ` Nick Piggin
2012-05-15 12:58 ` Luming Yu
2012-05-15 13:06 ` Peter Zijlstra [this message]
2012-05-15 13:27 ` Luming Yu
2012-05-15 13:28 ` Alex Shi
2012-05-15 13:33 ` Alex Shi
2012-05-15 13:39 ` Steven Rostedt
2012-05-15 14:04 ` Borislav Petkov
2012-05-15 13:08 ` Luming Yu
2012-05-15 14:07 ` Alex Shi
2012-05-15 9:18 ` Peter Zijlstra
2012-05-15 9:52 ` Nick Piggin
2012-05-15 10:00 ` Peter Zijlstra
2012-05-15 10:06 ` Nick Piggin
2012-05-15 10:13 ` Peter Zijlstra
2012-05-15 14:04 ` Alex Shi
2012-05-15 13:24 ` Alex Shi
2012-05-15 14:36 ` Peter Zijlstra
2012-05-15 14:57 ` Peter Zijlstra
2012-05-15 15:01 ` Alex Shi
2012-05-16 6:46 ` Alex Shi
2012-05-16 6:46 ` Alex Shi
2012-05-16 8:00 ` Peter Zijlstra
2012-05-16 8:04 ` Peter Zijlstra
2012-05-16 8:53 ` Alex Shi
2012-05-16 8:58 ` Peter Zijlstra
2012-05-16 10:58 ` Alex Shi
2012-05-16 11:04 ` Peter Zijlstra
2012-05-16 12:57 ` Alex Shi
2012-05-16 13:34 ` Alex Shi
2012-05-16 13:34 ` Alex Shi
2012-05-16 21:09 ` Peter Zijlstra
2012-05-17 0:43 ` Alex Shi
2012-05-17 2:07 ` Steven Rostedt
2012-05-17 8:04 ` Alex Shi
2012-05-17 2:14 ` Paul Mundt
2012-05-16 13:44 ` Alex Shi
2012-05-15 8:55 ` [PATCH v5 7/7] x86/tlb: add tlb_flushall_shift knob into debugfs Alex Shi
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