From: Rob Landley <rob@landley.net>
To: Alex Shi <alex.shi@intel.com>
Cc: Borislav Petkov <bp@amd64.org>,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
arnd@arndb.de, rostedt@goodmis.org, fweisbec@gmail.com,
jeremy@goop.org, gregkh@linuxfoundation.org, riel@redhat.com,
luto@mit.edu, avi@redhat.com, len.brown@intel.com,
dhowells@redhat.com, fenghua.yu@intel.com, 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,
paul.gortmaker@windriver.com, trenn@suse.de, tj@kernel.org,
oleg@redhat.com, axboe@kernel.dk, a.p.zijlstra@chello.nl,
kamezawa.hiroyu@jp.fujitsu.com, viro@zeniv.linux.org.uk,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 3/7] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range
Date: Thu, 10 May 2012 16:42:31 -0500 [thread overview]
Message-ID: <4FAC3647.8020203@landley.net> (raw)
In-Reply-To: <4FAB8169.7090809@intel.com>
On 05/10/2012 03:50 AM, Alex Shi wrote:
>>
>
>> Ok, question:
>>
>> we're comparing TLB size with the amount of pages mapped by this mm
>> struct. AFAICT, that doesn't mean that all those mapped pages do have
>> respective entries in the TLB, does it?
>>
>> If so, then the actual entries number is kinda inaccurate, no? We don't
>> really know how many TLB entries actually belong to this mm struct. Or am I
>> missing something?
>
> No, we can not know the exactly TLB entires for. But usually, when you
> process is doing the mprotect/munmap etc system call, your process has
> taken much of memory and already filled lots of TLB entries.
$ strace true 2>&1 | grep mprotect
mprotect(0x7f67a934b000, 2093056, PROT_NONE) = 0
mprotect(0x7f67a954a000, 16384, PROT_READ) = 0
mprotect(0x607000, 4096, PROT_READ) = 0
mprotect(0x7f67a9773000, 4096, PROT_READ) = 0
This appears to be part of glibc process setup. Define "usually".
Rob
--
GNU/Linux isn't: Linux=GPLv2, GNU=GPLv3+, they can't share code.
Either it's "mere aggregation", or a license violation. Pick one.
next prev parent reply other threads:[~2012-05-10 21:42 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 5:00 [PATCH v4 0/7] tlb flush optimization Alex Shi
2012-05-10 5:00 ` [PATCH v4 1/7] x86/tlb: unify TLB_FLUSH_ALL definition Alex Shi
2012-05-10 18:46 ` Rob Landley
2012-05-11 18:33 ` H. Peter Anvin
2012-05-10 5:00 ` [PATCH v4 2/7] x86/tlb_info: get last level TLB entry number of CPU Alex Shi
2012-05-10 14:43 ` Borislav Petkov
2012-05-11 0:33 ` Alex Shi
2012-05-10 15:58 ` Borislav Petkov
2012-05-11 0:38 ` Alex Shi
2012-05-10 5:00 ` [PATCH v4 3/7] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range Alex Shi
2012-05-10 7:53 ` Borislav Petkov
2012-05-10 8:50 ` Alex Shi
2012-05-10 21:42 ` Rob Landley [this message]
2012-05-10 8:42 ` Borislav Petkov
2012-05-10 9:04 ` Alex Shi
2012-05-12 8:01 ` Alex Shi
2012-05-13 11:13 ` Borislav Petkov
2012-05-15 1:06 ` Alex Shi
2012-05-15 10:33 ` Borislav Petkov
2012-05-15 11:16 ` Peter Zijlstra
2012-05-15 11:56 ` Borislav Petkov
2012-05-15 12:00 ` Peter Zijlstra
2012-05-15 13:58 ` Alex Shi
2012-05-10 5:00 ` [PATCH v4 4/7] x86/tlb: fall back to flush all when meet a THP large page Alex Shi
2012-05-10 9:29 ` Peter Zijlstra
2012-05-10 10:40 ` Borislav Petkov
2012-05-11 0:44 ` Alex Shi
2012-05-11 9:03 ` Peter Zijlstra
2012-05-11 16:28 ` Andrea Arcangeli
2012-05-12 7:58 ` Alex Shi
2012-05-10 5:00 ` [PATCH v4 5/7] x86/tlb: add tlb flush all factor for specific CPU Alex Shi
2012-05-10 9:35 ` Peter Zijlstra
2012-05-11 0:47 ` Alex Shi
2012-05-10 9:37 ` Peter Zijlstra
2012-05-11 0:48 ` Alex Shi
2012-05-10 9:38 ` Peter Zijlstra
2012-05-10 10:42 ` Borislav Petkov
2012-05-11 0:50 ` Alex Shi
2012-05-11 0:49 ` Alex Shi
2012-05-11 9:04 ` Peter Zijlstra
2012-05-11 9:04 ` Peter Zijlstra
2012-05-11 12:51 ` Alex Shi
2012-05-10 5:00 ` [PATCH v4 6/7] x86/tlb: optimizing flush_tlb_mm Alex Shi
2012-05-10 8:27 ` Peter Zijlstra
2012-05-10 5:00 ` [PATCH v4 7/7] x86/tlb: add tlb_flushall_factor into sysfs for user testing/tuning Alex Shi
2012-05-10 8:27 ` Borislav Petkov
2012-05-11 0:52 ` Alex Shi
2012-05-11 9:51 ` Borislav Petkov
2012-05-11 12:53 ` Alex Shi
2012-05-10 15:13 ` Greg KH
2012-05-11 0:59 ` Alex Shi
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