linux-kernel - Re: [PATCHSET x86/core/percpu] improve the first percpu chunk allocation

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Date:	Tue, 24 Feb 2009 21:17:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	rusty@...tcorp.com.au, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, jeremy@...p.org,
	cpw@....com, nickpiggin@...oo.com.au, ink@...assic.park.msu.ru
Subject: Re: [PATCHSET x86/core/percpu] improve the first percpu chunk
	allocation

* Tejun Heo <tj@...nel.org> wrote:

> Hello, all.
> 
> This patchset improves the first percpu chunk allocation.  The 
> problem is that the dynamic percpu area allocation maps the 
> whole percpu area into vmalloc area using 4k mappings which 
> adds considerable amount of TLB pressure.

> This patchset is available in the following git tree.
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git tj-percpu

ok, i pulled it into tip:core/percpu (one conflict resolution 
done - please double check it), and exposed it to -tip testing 
briefly.

Six x86 test-systems failed ;-) One of them had this panic:

Scan SMP from ffff880000000000 for 1024 bytes.
Scan SMP from ffff88000009fc00 for 1024 bytes.
Scan SMP from ffff8800000f0000 for 65536 bytes.
found SMP MP-table at [ffff8800000fe680] fe680
PANIC: early exception 0  rip   :                 error   cr2       
PANIC: early exception 0  rip   :                 error   cr2   

config attached. Ought to be easy to reproduce.

	Ingo

View attachment "config" of type "text/plain" (64432 bytes)