On Tue, 28 Jan 2014, Dave Hansen wrote:
> It has measurable performance benefits, and the benefits go up as the
> cost of en/disabling interrupts goes up (like if it takes you a hypercall).
>
> Fengguang, could you run a set of tests for the top patch in this branch
> to see if we'd be giving
Hi Dave,
> > Fengguang, could you run a set of tests for the top patch in this branch
> > to see if we'd be giving much up by axing the code?
> >
> >
> > https://github.com/hansendc/linux/tree/slub-nocmpxchg-for-Fengguang-20140128
>
> Sure, I've queued tests for the branch. Will report
Hi Dave,
Fengguang, could you run a set of tests for the top patch in this branch
to see if we'd be giving much up by axing the code?
https://github.com/hansendc/linux/tree/slub-nocmpxchg-for-Fengguang-20140128
Sure, I've queued tests for the branch. Will report back after 1-2
On Tue, 28 Jan 2014, Dave Hansen wrote:
It has measurable performance benefits, and the benefits go up as the
cost of en/disabling interrupts goes up (like if it takes you a hypercall).
Fengguang, could you run a set of tests for the top patch in this branch
to see if we'd be giving much up
On Tue, Jan 28, 2014 at 03:52:47PM -0800, Dave Hansen wrote:
> On 01/28/2014 03:29 PM, Andrew Morton wrote:
> > On Tue, 28 Jan 2014 15:17:22 -0800 Dave Hansen wrote:
> > This code is borderline insane.
>
> No argument here.
>
> > Yes, struct page is special and it's worth spending time and
On 01/28/2014 03:29 PM, Andrew Morton wrote:
> On Tue, 28 Jan 2014 15:17:22 -0800 Dave Hansen wrote:
> This code is borderline insane.
No argument here.
> Yes, struct page is special and it's worth spending time and doing
> weird things to optimise it. But sheesh.
>
> An alternative is to
On Tue, 28 Jan 2014 15:17:22 -0800 Dave Hansen wrote:
> Commit abca7c496 notes that we can not _set_ a page->counters
> directly, except when using a real double-cmpxchg. Doing so can
> lose updates to ->_count.
>
> That an absolute rule:
>
> You may not *set* page->counters except
From: Dave Hansen
Commit abca7c496 notes that we can not _set_ a page->counters
directly, except when using a real double-cmpxchg. Doing so can
lose updates to ->_count.
That an absolute rule:
You may not *set* page->counters except via a cmpxchg.
Commit abca7c496 fixed this for the
From: Dave Hansen dave.han...@linux.intel.com
Commit abca7c496 notes that we can not _set_ a page-counters
directly, except when using a real double-cmpxchg. Doing so can
lose updates to -_count.
That an absolute rule:
You may not *set* page-counters except via a cmpxchg.
Commit
On Tue, 28 Jan 2014 15:17:22 -0800 Dave Hansen d...@sr71.net wrote:
Commit abca7c496 notes that we can not _set_ a page-counters
directly, except when using a real double-cmpxchg. Doing so can
lose updates to -_count.
That an absolute rule:
You may not *set* page-counters except
On 01/28/2014 03:29 PM, Andrew Morton wrote:
On Tue, 28 Jan 2014 15:17:22 -0800 Dave Hansen d...@sr71.net wrote:
This code is borderline insane.
No argument here.
Yes, struct page is special and it's worth spending time and doing
weird things to optimise it. But sheesh.
An alternative is
On Tue, Jan 28, 2014 at 03:52:47PM -0800, Dave Hansen wrote:
On 01/28/2014 03:29 PM, Andrew Morton wrote:
On Tue, 28 Jan 2014 15:17:22 -0800 Dave Hansen d...@sr71.net wrote:
This code is borderline insane.
No argument here.
Yes, struct page is special and it's worth spending time and
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