On Thu, Mar 22, 2018 at 08:17:19AM -0700, Matthew Wilcox wrote:
> On Tue, Mar 13, 2018 at 11:34:53AM +0800, Aaron Lu wrote:
> > I wish there is a data structure that has the flexibility of list while
> > at the same time we can locate the Nth element in the list without the
> > need to iterate. Tha
On Tue, Mar 13, 2018 at 11:34:53AM +0800, Aaron Lu wrote:
> I wish there is a data structure that has the flexibility of list while
> at the same time we can locate the Nth element in the list without the
> need to iterate. That's what I'm looking for when developing clustered
> allocation for orde
On Mon, Mar 12, 2018 at 03:22:53PM +0100, Vlastimil Babka wrote:
> On 03/01/2018 07:28 AM, Aaron Lu wrote:
> > When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> > the zone->lock is held and then pages are chosen from PCP's migratetype
> > list. While there is actually no need t
On 03/01/2018 07:28 AM, Aaron Lu wrote:
> When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> the zone->lock is held and then pages are chosen from PCP's migratetype
> list. While there is actually no need to do this 'choose part' under
> lock since it's PCP pages, the only CPU t
On 03/02/2018 01:23 PM, Andrew Morton wrote:
>> On my Sandybridge desktop, with will-it-scale/page_fault1/single process
>> run to emulate uniprocessor system, the score is(average of 3 runs):
>>
>> base(patch 1/3): 649710
>> this patch: 653554 +0.6%
> Does that mean we got faster or
On Fri, 2 Mar 2018 16:01:25 +0800 Aaron Lu wrote:
> On Thu, Mar 01, 2018 at 04:01:05PM -0800, Andrew Morton wrote:
> > On Thu, 1 Mar 2018 14:28:44 +0800 Aaron Lu wrote:
> >
> > > When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> > > the zone->lock is held and then pages ar
On 03/01/2018 11:15 PM, Aaron Lu wrote:
>
>> I am still quite surprised that this would have such a large impact.
> Most likely due to the cachelines for these page structures are warmed
> up outside of zone->lock.
The workload here is a pretty tight microbenchmark and single biggest
bottleneck i
On Thu, Mar 01, 2018 at 04:01:05PM -0800, Andrew Morton wrote:
> On Thu, 1 Mar 2018 14:28:44 +0800 Aaron Lu wrote:
>
> > When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> > the zone->lock is held and then pages are chosen from PCP's migratetype
> > list. While there is actua
Michal Hocko writes:
> On Thu 01-03-18 14:28:44, Aaron Lu wrote:
>> When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
>> the zone->lock is held and then pages are chosen from PCP's migratetype
>> list. While there is actually no need to do this 'choose part' under
>> lock since
On Thu, Mar 01, 2018 at 02:55:18PM +0100, Michal Hocko wrote:
> On Thu 01-03-18 14:28:44, Aaron Lu wrote:
> > When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> > the zone->lock is held and then pages are chosen from PCP's migratetype
> > list. While there is actually no need to
On Thu, 1 Mar 2018 14:28:44 +0800 Aaron Lu wrote:
> When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> the zone->lock is held and then pages are chosen from PCP's migratetype
> list. While there is actually no need to do this 'choose part' under
> lock since it's PCP pages, t
On Thu 01-03-18 14:28:44, Aaron Lu wrote:
> When freeing a batch of pages from Per-CPU-Pages(PCP) back to buddy,
> the zone->lock is held and then pages are chosen from PCP's migratetype
> list. While there is actually no need to do this 'choose part' under
> lock since it's PCP pages, the only CPU
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