Eiichi Tsukata writes:
But that comes with a challenge: despite listening on cgroup for
pressure notifications (which happen from those runtime events we do
not control),
We do also have global pressure (PSI) counters. Have you tried to look
into those and try to back off even when the
Hi Michal
> On Feb 17, 2021, at 21:31, Michal Hocko wrote:
>
> On Wed 17-02-21 10:42:24, Eiichi Tsukata wrote:
>> Hi All,
>>
>> Firstly, thank you for your careful review and attention to my patch
>> (and apologies for top-posting!). Let me first explain why our use
>> case requires hugetlb
On Tue, Feb 16, 2021 at 5:25 PM David Rientjes wrote:
>
> On Tue, 16 Feb 2021, Michal Hocko wrote:
>
> > > Hugepages can be preallocated to avoid unpredictable allocation latency.
> > > If we run into 4k page shortage, the kernel can trigger OOM even though
> > > there were free hugepages. When
On Wed 17-02-21 13:31:07, Michal Hocko wrote:
[...]
> Thanks for your usecase description. It helped me to understand what you
> are doing and how this can be really useful for your particular setup.
> This is really a very specific situation from my POV. I am not yet sure
> this is generic enough
On Wed 17-02-21 10:42:24, Eiichi Tsukata wrote:
> Hi All,
>
> Firstly, thank you for your careful review and attention to my patch
> (and apologies for top-posting!). Let me first explain why our use
> case requires hugetlb over THP and then elaborate on the difficulty we
> have to maintain the
Hi All,
Firstly, thank you for your careful review and attention to my patch
(and apologies for top-posting!). Let me first explain why our use
case requires hugetlb over THP and then elaborate on the difficulty we
have to maintain the correct number of hugepages in the pool, finally
concluding
On 16.02.21 04:07, Eiichi Tsukata wrote:
Hugepages can be preallocated to avoid unpredictable allocation latency.
If we run into 4k page shortage, the kernel can trigger OOM even though
there were free hugepages. When OOM is triggered by user address page
fault handler, we can use oom notifier
On Tue 16-02-21 14:30:15, Mike Kravetz wrote:
[...]
> However, this is an 'opt in' feature. So, I would not expect anyone who
> carefully plans the size of their hugetlb pool to enable such a feature.
> If there is a use case where hugetlb pages are used in a non-essential
> application, this
On Tue 16-02-21 13:53:12, David Rientjes wrote:
> On Tue, 16 Feb 2021, Michal Hocko wrote:
[...]
> > Overall, I am not really happy about this feature even when above is
> > fixed, but let's hear more the actual problem first.
>
> Shouldn't this behavior be possible as an oomd plugin instead,
On 2/16/21 12:12 AM, Michal Hocko wrote:
> On Tue 16-02-21 03:07:13, Eiichi Tsukata wrote:
>> Hugepages can be preallocated to avoid unpredictable allocation latency.
>> If we run into 4k page shortage, the kernel can trigger OOM even though
>> there were free hugepages. When OOM is triggered by
On Tue, 16 Feb 2021, Michal Hocko wrote:
> > Hugepages can be preallocated to avoid unpredictable allocation latency.
> > If we run into 4k page shortage, the kernel can trigger OOM even though
> > there were free hugepages. When OOM is triggered by user address page
> > fault handler, we can use
Hi Eiichi,
I agree with Michal's points, and I think there are also some other design
questions which don't quite make sense to me. Perhaps you can clear them up?
:-)
Eiichi Tsukata writes:
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 4bdb58ab14cb..e2d57200fd00 100644
--- a/mm/hugetlb.c
On Tue 16-02-21 03:07:13, Eiichi Tsukata wrote:
> Hugepages can be preallocated to avoid unpredictable allocation latency.
> If we run into 4k page shortage, the kernel can trigger OOM even though
> there were free hugepages. When OOM is triggered by user address page
> fault handler, we can use
Hugepages can be preallocated to avoid unpredictable allocation latency.
If we run into 4k page shortage, the kernel can trigger OOM even though
there were free hugepages. When OOM is triggered by user address page
fault handler, we can use oom notifier to free hugepages in user space
but if it's
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