From: "Jan Beulich" <JBeulich@suse.com>
To: "Alex Shi" <alex.shi@intel.com>
Cc: <borislav.petkov@amd.com>, <arnd@arndb.de>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
<akinobu.mita@gmail.com>, <eric.dumazet@gmail.com>,
<fweisbec@gmail.com>, <rostedt@goodmis.org>, <hughd@google.com>,
<jeremy@goop.org>, <len.brown@intel.com>, <tony.luck@intel.com>,
<yongjie.ren@intel.com>, <kamezawa.hiroyu@jp.fujitsu.com>,
<seto.hidetoshi@jp.fujitsu.com>, <penberg@kernel.org>,
<yinghai@kernel.org>, <tglx@linutronix.de>,
<akpm@linux-foundation.org>, <ak@linux.intel.com>, <luto@mit.edu>,
<avi@redhat.com>, <dhowells@redhat.com>, <mingo@redhat.com>,
<riel@redhat.com>, "Rusty Russell" <rusty@rustcorp.com.au>,
<cpw@sgi.com>, <steiner@sgi.com>, <linux-kernel@vger.kernel.org>,
<viro@zeniv.linux.org.uk>, <hpa@zytor.com>
Subject: Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings of SMT
Date: Thu, 24 May 2012 10:46:50 +0100 [thread overview]
Message-ID: <4FBE1FAA0200007800085CC4@nat28.tlf.novell.com> (raw)
In-Reply-To: <4FBDFF11.7030105@intel.com>
>>> On 24.05.12 at 11:27, Alex Shi <alex.shi@intel.com> wrote:
> On 05/24/2012 04:42 PM, Peter Zijlstra wrote:
>
>> On Thu, 2012-05-24 at 16:32 +0800, Alex Shi wrote:
>>> So, I use cpumask_t in stack.
>>
>> cpumask_t is 512 bytes with NR_CPUS=4096, that's generally considered
>> too big to be on stack.
>
>
> I am not consistent with cpumask_t.
> I just want to know why it is too big on stack? Since if it causes
> trouble in using, that mean current kernel will fail to run on 4096 CPU
> system.
Why? Did you spot critical left-over instances of on-stack
cpumask_t-s anywhere?
Jan
next prev parent reply other threads:[~2012-05-24 9:46 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-23 14:15 [PATCH v7 0/8] x86 tlb optimisations Alex Shi
2012-05-23 14:15 ` [PATCH v7 1/8] x86/tlb_info: get last level TLB entry number of CPU Alex Shi
2012-05-23 14:15 ` [PATCH v7 2/8] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range Alex Shi
2012-05-23 14:51 ` Jan Beulich
2012-05-24 6:41 ` Alex Shi
2012-05-24 8:12 ` Jan Beulich
2012-05-24 8:55 ` Alex Shi
2012-05-24 9:44 ` Jan Beulich
2012-05-24 14:36 ` Alex Shi
2012-05-25 2:43 ` Alex Shi
2012-05-23 14:15 ` [PATCH v7 3/8] x86/tlb: fall back to flush all when meet a THP large page Alex Shi
2012-05-23 14:15 ` [PATCH v7 4/8] x86/tlb: add tlb_flushall_shift for specific CPU Alex Shi
2012-05-23 14:15 ` [PATCH v7 5/8] x86/tlb: enable tlb flush range support for generic mmu and x86 Alex Shi
2012-05-23 14:15 ` [PATCH v7 6/8] x86/tlb: add tlb_flushall_shift knob into debugfs Alex Shi
2012-05-23 14:15 ` [PATCH v7 7/8] x86/tlb: replace INVALIDATE_TLB_VECTOR by CALL_FUNCTION_VECTOR Alex Shi
2012-05-23 14:15 ` [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings of SMT Alex Shi
2012-05-23 15:05 ` Jan Beulich
2012-05-23 17:09 ` Peter Zijlstra
2012-05-23 17:15 ` Peter Zijlstra
2012-05-24 1:46 ` Andrew Lutomirski
2012-05-24 5:12 ` Alex Shi
2012-05-24 6:04 ` Borislav Petkov
2012-05-24 7:40 ` Peter Zijlstra
2012-05-24 13:19 ` Andrew Lutomirski
2012-05-24 13:23 ` Peter Zijlstra
2012-05-24 13:39 ` Arjan van de Ven
2012-05-24 13:54 ` Alex Shi
2012-05-24 14:18 ` Arjan van de Ven
2012-05-24 14:32 ` Alex Shi
2012-05-24 15:03 ` H. Peter Anvin
2012-05-25 0:24 ` Alex Shi
2012-05-24 16:08 ` Arjan van de Ven
2012-05-25 0:28 ` Alex Shi
2012-05-25 0:46 ` Arjan van de Ven
2012-05-24 8:32 ` Alex Shi
2012-05-24 8:42 ` Peter Zijlstra
2012-05-24 8:48 ` Alex Shi
2012-05-24 11:35 ` Rusty Russell
2012-05-24 14:03 ` Alex Shi
2012-05-24 9:27 ` Alex Shi
2012-05-24 9:42 ` Peter Zijlstra
2012-05-24 9:46 ` Jan Beulich [this message]
2012-05-24 14:06 ` Alex Shi
2012-05-24 8:43 ` Peter Zijlstra
2012-05-24 8:48 ` Jan Beulich
2012-05-24 9:02 ` Alex Shi
2012-05-24 9:45 ` Jan Beulich
2012-05-24 15:04 ` H. Peter Anvin
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