On Sun, Jul 14, 2013 at 11:12:58AM +0800, Sam Ben wrote:
> On 07/02/2013 10:37 AM, Zheng Liu wrote:
> >On Mon, Jul 01, 2013 at 09:16:46AM -0700, Dave Hansen wrote:
> >>On 06/28/2013 07:20 PM, Zheng Liu wrote:
> >IOW, a process needing to do a bunch of MAP_POPULATEs isn't
> >parallelizable,
On 07/02/2013 10:37 AM, Zheng Liu wrote:
On Mon, Jul 01, 2013 at 09:16:46AM -0700, Dave Hansen wrote:
On 06/28/2013 07:20 PM, Zheng Liu wrote:
IOW, a process needing to do a bunch of MAP_POPULATEs isn't
parallelizable, but one using this mechanism would be.
I look at the code, and it seems tha
On Mon, Jul 01, 2013 at 09:43:29PM -0700, Dave Hansen wrote:
> On 07/01/2013 07:37 PM, Zheng Liu wrote:
> > FWIW, it would be great if we can let MAP_POPULATE flag support shared
> > mappings because in our product system there has a lot of applications
> > that uses mmap(2) and then pre-faults thi
On 07/01/2013 07:37 PM, Zheng Liu wrote:
> FWIW, it would be great if we can let MAP_POPULATE flag support shared
> mappings because in our product system there has a lot of applications
> that uses mmap(2) and then pre-faults this mapping. Currently these
> applications need to pre-fault the mapp
On Mon, Jul 01, 2013 at 09:16:46AM -0700, Dave Hansen wrote:
> On 06/28/2013 07:20 PM, Zheng Liu wrote:
> >> > IOW, a process needing to do a bunch of MAP_POPULATEs isn't
> >> > parallelizable, but one using this mechanism would be.
> > I look at the code, and it seems that we will handle MAP_POPUL
On 06/28/2013 07:20 PM, Zheng Liu wrote:
>> > IOW, a process needing to do a bunch of MAP_POPULATEs isn't
>> > parallelizable, but one using this mechanism would be.
> I look at the code, and it seems that we will handle MAP_POPULATE flag
> after we release mmap_sem locking in vm_mmap_pgoff():
>
>
On 06/28/2013 11:48 PM, Dave Hansen wrote:
> On 06/27/2013 10:47 PM, Zheng Liu wrote:
>>> I've been doing some testing involving large amounts of
>>> page cache. It's quite painful to get hundreds of GB
>>> of page cache mapped in, especially when I am trying to
>>> do it in parallel threads. Thi
On 06/27/2013 10:47 PM, Zheng Liu wrote:
>> I've been doing some testing involving large amounts of
>> page cache. It's quite painful to get hundreds of GB
>> of page cache mapped in, especially when I am trying to
>> do it in parallel threads. This is true even when the
>> page cache is already
Hi Dave,
On Thu, Jun 27, 2013 at 04:16:05PM -0700, Dave Hansen wrote:
>
> I've been doing some testing involving large amounts of
> page cache. It's quite painful to get hundreds of GB
> of page cache mapped in, especially when I am trying to
> do it in parallel threads. This is true even when
I've been doing some testing involving large amounts of
page cache. It's quite painful to get hundreds of GB
of page cache mapped in, especially when I am trying to
do it in parallel threads. This is true even when the
page cache is already allocated and I only need to map
it in. The test:
1.
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