Hi.
On Tue, May 14, 2019 at 12:12:16PM +0300, Kirill Tkhai wrote:
> > Immediate question: what should be actually done on this? I see 2
> > options:
> >
> > 1) mark all VMAs as mergeable + set some flag for mmap() to mark all
> > further allocations as mergeable as well;
> > 2) just mark all the
On 14.05.2019 09:30, Oleksandr Natalenko wrote:
> Hi.
>
> On Mon, May 13, 2019 at 03:37:56PM +0300, Kirill Tkhai wrote:
>>> Yes, I get your point. But the intention is to avoid another hacky trick
>>> (LD_PRELOAD), thus *something* should *preferably* be done on the
>>> kernel level instead.
>>
Hi.
On Mon, May 13, 2019 at 03:37:56PM +0300, Kirill Tkhai wrote:
> > Yes, I get your point. But the intention is to avoid another hacky trick
> > (LD_PRELOAD), thus *something* should *preferably* be done on the
> > kernel level instead.
>
> I don't think so. Does userspace hack introduce some
On 13.05.2019 14:33, Oleksandr Natalenko wrote:
> Hi.
>
> On Mon, May 13, 2019 at 01:38:43PM +0300, Kirill Tkhai wrote:
>> On 10.05.2019 10:21, Oleksandr Natalenko wrote:
>>> By default, KSM works only on memory that is marked by madvise(). And the
>>> only way to get around that is to either:
On Mon, May 13, 2019 at 02:01:17PM +0200, Oleksandr Natalenko wrote:
> On Mon, May 13, 2019 at 02:48:29PM +0300, Timofey Titovets wrote:
> > > Also, just for the sake of another piece of stats here:
> > >
> > > $ echo "$(cat /sys/kernel/mm/ksm/pages_sharing) * 4 / 1024" | bc
> > > 526
> >
> >
On Mon, May 13, 2019 at 02:48:29PM +0300, Timofey Titovets wrote:
> > Also, just for the sake of another piece of stats here:
> >
> > $ echo "$(cat /sys/kernel/mm/ksm/pages_sharing) * 4 / 1024" | bc
> > 526
>
> IIRC, for calculate saving you must use (pages_shared - pages_sharing)
Based on
пн, 13 мая 2019 г. в 14:33, Oleksandr Natalenko :
>
> Hi.
>
> On Mon, May 13, 2019 at 01:38:43PM +0300, Kirill Tkhai wrote:
> > On 10.05.2019 10:21, Oleksandr Natalenko wrote:
> > > By default, KSM works only on memory that is marked by madvise(). And the
> > > only way to get around that is to
Hi.
On Mon, May 13, 2019 at 01:38:43PM +0300, Kirill Tkhai wrote:
> On 10.05.2019 10:21, Oleksandr Natalenko wrote:
> > By default, KSM works only on memory that is marked by madvise(). And the
> > only way to get around that is to either:
> >
> > * use LD_PRELOAD; or
> > * patch the kernel
Hi, Oleksandr,
On 10.05.2019 10:21, Oleksandr Natalenko wrote:
> By default, KSM works only on memory that is marked by madvise(). And the
> only way to get around that is to either:
>
> * use LD_PRELOAD; or
> * patch the kernel with something like UKSM or PKSM.
>
> Instead, lets implement a
By default, KSM works only on memory that is marked by madvise(). And the
only way to get around that is to either:
* use LD_PRELOAD; or
* patch the kernel with something like UKSM or PKSM.
Instead, lets implement a so-called "always" mode, which allows marking
VMAs as mergeable on
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