Hi,
From: Linus Torvalds <[EMAIL PROTECTED]>
> On Wed, 3 Oct 2007, Pekka Enberg wrote:
> >
> > On 10/3/07, Linus Torvalds <[EMAIL PROTECTED]> wrote:
> > > I would bet that the reason the intel-optimized memcpy triggers this is
> > > that the non-temporal stores just means that you go out directly
ommunity is very innovative.
Linux is the first OS developed by very large community. (Bazaar Model)
Regards,
Hiro
--
Hiro Yoshioka
mailto:hyoshiok at miraclelinux.com
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s file with patches
that happen to modify the originals. That way they can easily keep up
with the minor number of changes that happen over time.
I think that some members of YLUG (Yokohama Linux Users Group)
may help to review the translations. :-)
Regards,
Hiro
--
Hiro Yoshioka
mailto:hyoshio
From: Robert Hancock <[EMAIL PROTECTED]>
Subject: Re: SMP performance degradation with sysbench
Date: Tue, 27 Feb 2007 18:20:25 -0600
Message-ID: <[EMAIL PROTECTED]>
> Hiro Yoshioka wrote:
> > Howdy,
> >
> > MySQL 5.0.26 had some scalability issues an
Hi,
From: Rik van Riel <[EMAIL PROTECTED]>
> Hiro Yoshioka wrote:
> > Howdy,
> >
> > MySQL 5.0.26 had some scalability issues and it solved since 5.0.32
> > http://ossipedia.ipa.go.jp/capacity/EV0612260303/
> > (written in Japanese but you may read the
ROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Regards,
Hiro
--
Hiro Yoshioka
mailto:hyoshiok at miraclelinux.com
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From: Andrew Morton <[EMAIL PROTECTED]>
> Dave Jones <[EMAIL PROTECTED]> wrote:
> >
> > On Sun, Sep 04, 2005 at 01:16:00PM -0700, Andrew Morton wrote:
> > > unsigned long __copy_to_user_ll(void __user *to, const void *from,
> > unsigned long n)
> > > {
> > > BUG_ON((long) n < 0);
From: Hiro Yoshioka <[EMAIL PROTECTED]>
Subject: Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()
Date: Fri, 02 Sep 2005 13:37:16 +0900 (JST)
Message-ID: <[EMAIL PROTECTED]>
> From: Andrew Morton <[EMAIL PROTECTED]>
> > Hiro Yoshioka <[EMAIL PROTECTED]
From: Andrew Morton <[EMAIL PROTECTED]>
> Hiro Yoshioka <[EMAIL PROTECTED]> wrote:
> >
> > --- linux-2.6.12.4.orig/arch/i386/lib/usercopy.c2005-08-05
> > 16:04:37.0 +0900
> > +++ linux-2.6.12.4.nt/arch/i386/lib/usercopy.c 2005-09-01
&
Andrew,
From: Andrew Morton <[EMAIL PROTECTED]>
> Andi Kleen <[EMAIL PROTECTED]> wrote:
> >
> > On Friday 02 September 2005 04:08, Andrew Morton wrote:
> >
> > > I suppose I'll queue it up in -mm for a while, although I'm a bit dubious
> > > about the whole idea... We'll gain some and we'll lose
From: Andi Kleen <[EMAIL PROTECTED]>
> On Thursday 01 September 2005 11:07, Hiro Yoshioka wrote:
>
> > The following is the almost final version of the
> > cache pollution aware __copy_from_user_ll() patch.
>
> Looks good to me.
>
> Once the filemap.c h
Hi,
> From: Andi Kleen <[EMAIL PROTECTED]>
> > > Hi,
> > >
> > > The following patch does not use MMX regsiters so that we don't have
> > > to worry about save/restore the FPU/MMX states.
> > >
> > > What do you think?
> >
> > Performance will probably be bad on K7 Athlons - those have a microc
From: Andi Kleen <[EMAIL PROTECTED]>
> > Hi,
> >
> > The following patch does not use MMX regsiters so that we don't have
> > to worry about save/restore the FPU/MMX states.
> >
> > What do you think?
>
> Performance will probably be bad on K7 Athlons - those have a microcoded
> movnti which is
From: Hirokazu Takahashi <[EMAIL PROTECTED]>
> > The following patch does not use MMX regsiters so that we don't have
> > to worry about save/restore the FPU/MMX states.
> >
> > What do you think?
>
> I think __copy_user_zeroing_intel_nocache() should be followed by sfence
> or mfence instruction
{
+ might_sleep();
+ return __copy_from_user_inatomic_nocache(to, from, n);
+}
+
unsigned long __must_check copy_to_user(void __user *to,
const void *from, unsigned long n);
unsigned long __must_check copy_from_user(void *to,
diff -ur linux-2.6.12.4.orig/mm/filemap.c linux
Hi,
It seems to me this mail does not go out.
So resending it.
> On 8/18/05, Hiro Yoshioka <[EMAIL PROTECTED]> wrote:
> > 1) using stack to save/restore MMX registers
>
> It seems to me that it has some regression.
> I'd like to rollback it and use kernel_fpu_begin
Hi,
It seems to me this mail does not go out.
So resending it.
> On 8/18/05, Hiro Yoshioka <[EMAIL PROTECTED]> wrote:
> > 1) using stack to save/restore MMX registers
>
> It seems to me that it has some regression.
> I'd like to rollback it and use kernel_fpu_begin
> On 8/18/05, Hiro Yoshioka <[EMAIL PROTECTED]> wrote:
> > 1) using stack to save/restore MMX registers
>
> It seems to me that it has some regression.
> I'd like to rollback it and use kernel_fpu_begin() and kernel_fpu_end().
The following is a current version of
Hi,
On 8/18/05, Hiro Yoshioka <[EMAIL PROTECTED]> wrote:
> 1) using stack to save/restore MMX registers
It seems to me that it has some regression.
I'd like to rollback it and use kernel_fpu_begin() and kernel_fpu_end().
Regards,
Hiro
--
Hiro Yoshioka
mailto:hyoshiok at miracle
rom, 1, ret, 1);
+ return ret;
+ case 2:
+ __get_user_size(*(u16 *)to, from, 2, ret, 2);
+ return ret;
+ case 4:
+ __get_user_size(*(u32 *)to, from, 4, ret, 4);
+ re
low latency version and the other is a throughput version.
What do you think?
Regards,
Hiro
--
Hiro Yoshioka
mailto:hyoshiok at miraclelinux.com
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More m
Chuck,
On 8/18/05, Chuck Ebbert <[EMAIL PROTECTED]> wrote:
> On Wed, 17 Aug 2005 at 13:50:22 +0900 (JST), Hiro Yoshioka wrote:
>
> > 3) page faults/exceptions/...
> > 3-1 TS flag is set by the CPU (Am I right?)
>
> TS will _not_ be set if a trap/fault or int
> Just take a look at __switch_to(), where __unlazy_fpu() is called.
Thanks. Does an exception handler (like page_fault, etc) come
from __switch_to()?
Regards,
Hiro
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More majo
truct task_struct *tsk = thread->task;
clts(); /* Allow maths ops (or we recurse) */
if (!tsk_used_math(tsk))
init_fpu(tsk);
restore_fpu(tsk);
thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */
}
Thanks in advance,
Hi
. Hiro, does it help you?
Thanks. I'm reading your patch but could not understand very well.
I'll ask you.
Regards,
Hiro
--
Hiro Yoshioka
mailto:hyoshiok at miraclelinux.com
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From: Hiro Yoshioka <[EMAIL PROTECTED]>
Subject: Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()
Date: Wed, 17 Aug 2005 08:21:53 +0900 (JST)
Message-ID: <[EMAIL PROTECTED]>
> Chuck,
>
> From: Chuck Ebbert <[EMAIL PROTECTED]>
> > On Tue, 16 Aug 2
Chuck,
From: Chuck Ebbert <[EMAIL PROTECTED]>
> On Tue, 16 Aug 2005 at 19:16:17 +0900 (JST), Hiro Yoshioka wrote:
> > oh, really? Does the linux kernel take care of
> > SSE save/restore on a task switch?
>
> Check out XMMS_SAVE and XMMS_RESTORE in include/asm-
From: Arjan van de Ven <[EMAIL PROTECTED]>
> > My code does nothing do it.
> >
> > I need a volunteer to implement it.
>
> it's actually not too hard; all you need is to use SSE and not MMX; and
> then just store sse register you're overwriting on the stack or so...
oh, really? Does the linux ke
Takahashi san,
I appreciate your comments.
> Hi,
>
> BTW, what are you going to do with the page-faults which may happen
> during __copy_user_zeroing_nocache()? The current process may be blocked
> in the handler for a while and get FPU registers polluted.
> kernel_fpu_begin() won't help the cas
From: Hiro Yoshioka <[EMAIL PROTECTED]>
Date: Tue, 16 Aug 2005 08:33:59 +0900
> Thanks.
>
> filemap_copy_from_user() calls __copy_from_user_inatomic() calls
> __copy_from_user_ll().
>
> I'll look at the code.
The following is a quick hack of cache aware implemen
e the most difference will be
> in the VFS for the write() system call, and the AIO variants thereof.
>
> generic_file_buffered_write() will be a good candidate to try first...
Thanks.
filemap_copy_from_user() calls __copy_from_user_inatomic() calls
__copy_from_user_ll().
I'll
Hi,
I appreciate your suggestion.
On 8/15/05, Arjan van de Ven <[EMAIL PROTECTED]> wrote:
>
> > Anyway we could not find the cache aware version of __copy_from_user_ll
> > has a big regression yet.
>
>
> that is because you spread the cache misses out from one place to all
> over the place, so
Hi,
From: Arjan van de Ven <[EMAIL PROTECTED]>
Subject: Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()
Date: Sun, 14 Aug 2005 12:35:43 +0200
Message-ID: <[EMAIL PROTECTED]>
> On Sun, 2005-08-14 at 19:22 +0900, Hiro Yoshioka wrote:
> > Thanks for your comments
Thanks for your comments.
On 8/14/05, Arjan van de Ven <[EMAIL PROTECTED]> wrote:
> On Sun, 2005-08-14 at 18:16 +0900, Hiro Yoshioka wrote:
> > Hi,
> >
> > The following is a patch to reduce a cache pollution
> > of __copy_from_user_ll().
> >
> >
Hi,
The following is a patch to reduce a cache pollution
of __copy_from_user_ll().
When I run simple iozone benchmark to find a performance bottleneck of
the linux kernel, I found that __copy_from_user_ll() spent CPU cycle
most and it did many cache misses.
The following is profiled by oprofile.
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