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Date: Tue, 5 Jun 2012 15:37:19 +0300
From: "Kirill A. Shutemov" <kirill@shutemov.name>
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Subject: Re: [devel] [partially solved] Q: exit_group slowness
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On Tue, Jun 05, 2012 at 01:08:28PM +0400, Dmitry V. Levin wrote:
> On Tue, Jun 05, 2012 at 09:06:22AM +0300, Kirill A. Shutemov wrote:
> > Похоже вот на это:
> > 
> > http://lkml.org/lkml/2012/6/3/34
> > 
> > Ниже по трэду Пол предлагает возможное решение.
> 
> Спасибо, откат на 3.2.14-std-def-alt1 радикально улучшил картинку:
> # env -i strace -r -eprocess /usr/bin/unshare -i /bin/true
>      0.000000 execve("/usr/bin/unshare", ["/usr/bin/unshare", "-i", "/bin/true"], [/* 0 vars */]) = 0
>      0.001357 arch_prctl(ARCH_SET_FS, 0x7f49add73700) = 0
>      0.000457 unshare(CLONE_NEWIPC)     = 0
>      0.000200 execve("/bin/true", ["/bin/true"], [/* 0 vars */]) = 0
>      0.000350 exit_group(0)             = ?
>      0.156461 +++ exited with 0 +++
> 
> Хотя до идеала еще далеко:
> # env -i strace -r /bin/true
>      0.000000 execve("/bin/true", ["/bin/true"], [/* 0 vars */]) = 0
>      0.000628 exit_group(0)             = ?
>      0.000329 +++ exited with 0 +++

exit_group() дорогой только для последнего процесса в namespace, так?
Думаю, это цена которую можно заплатить.

-- 
 Kirill A. Shutemov