On Tue, Mar 06, 2018 at 08:27:33PM +0800, Aaron Lu wrote:
> On Tue, Mar 06, 2018 at 08:55:57AM +0100, Vlastimil Babka wrote:
> > So the adjacent line prefetch might be disabled? Could you check bios or
> > the MSR mentioned in
> > https://software.intel.com/en-us/articles/disclosure-of-hw-prefetche
On Tue, Mar 06, 2018 at 08:55:57AM +0100, Vlastimil Babka wrote:
> On 03/05/2018 12:41 PM, Aaron Lu wrote:
> > On Fri, Mar 02, 2018 at 06:55:25PM +0100, Vlastimil Babka wrote:
> >> On 03/01/2018 03:00 PM, Michal Hocko wrote:
> >>>
> >>> I am really surprised that this has such a big impact.
> >>
>
On 03/05/2018 12:41 PM, Aaron Lu wrote:
> On Fri, Mar 02, 2018 at 06:55:25PM +0100, Vlastimil Babka wrote:
>> On 03/01/2018 03:00 PM, Michal Hocko wrote:
>>>
>>> I am really surprised that this has such a big impact.
>>
>> It's even stranger to me. Struct page is 64 bytes these days, exactly a
>> a
On Mon, Mar 05, 2018 at 07:41:59PM +0800, Aaron Lu wrote:
> On Fri, Mar 02, 2018 at 06:55:25PM +0100, Vlastimil Babka wrote:
> > On 03/01/2018 03:00 PM, Michal Hocko wrote:
> > > On Thu 01-03-18 14:28:45, Aaron Lu wrote:
> > >> When a page is freed back to the global pool, its buddy will be checked
On Fri, Mar 02, 2018 at 06:55:25PM +0100, Vlastimil Babka wrote:
> On 03/01/2018 03:00 PM, Michal Hocko wrote:
> > On Thu 01-03-18 14:28:45, Aaron Lu wrote:
> >> When a page is freed back to the global pool, its buddy will be checked
> >> to see if it's possible to do a merge. This requires accessi
On 03/02/2018 07:00 PM, Dave Hansen wrote:
> On 03/02/2018 09:55 AM, Vlastimil Babka wrote:
>> It's even stranger to me. Struct page is 64 bytes these days, exactly a
>> a cache line. Unless that changed, Intel CPUs prefetched a "buddy" cache
>> line (that forms an aligned 128 bytes block with the
On 03/02/2018 09:55 AM, Vlastimil Babka wrote:
> It's even stranger to me. Struct page is 64 bytes these days, exactly a
> a cache line. Unless that changed, Intel CPUs prefetched a "buddy" cache
> line (that forms an aligned 128 bytes block with the one we touch).
I believe that was a behavior th
On 03/01/2018 03:00 PM, Michal Hocko wrote:
> On Thu 01-03-18 14:28:45, Aaron Lu wrote:
>> When a page is freed back to the global pool, its buddy will be checked
>> to see if it's possible to do a merge. This requires accessing buddy's
>> page structure and that access could take a long time if it
On Thu, Mar 01, 2018 at 03:00:44PM +0100, Michal Hocko wrote:
> On Thu 01-03-18 14:28:45, Aaron Lu wrote:
> > When a page is freed back to the global pool, its buddy will be checked
> > to see if it's possible to do a merge. This requires accessing buddy's
> > page structure and that access could t
On Thu, Mar 01, 2018 at 04:09:50PM -0800, Andrew Morton wrote:
> On Thu, 1 Mar 2018 14:28:45 +0800 Aaron Lu wrote:
>
> > When a page is freed back to the global pool, its buddy will be checked
> > to see if it's possible to do a merge. This requires accessing buddy's
> > page structure and that
On Thu, 1 Mar 2018 14:28:45 +0800 Aaron Lu wrote:
> When a page is freed back to the global pool, its buddy will be checked
> to see if it's possible to do a merge. This requires accessing buddy's
> page structure and that access could take a long time if it's cache cold.
>
> This patch adds a
On Thu 01-03-18 14:28:45, Aaron Lu wrote:
> When a page is freed back to the global pool, its buddy will be checked
> to see if it's possible to do a merge. This requires accessing buddy's
> page structure and that access could take a long time if it's cache cold.
>
> This patch adds a prefetch to
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