From: Shakeel Butt <shakeelb@google.com>
To: David Hildenbrand <david@redhat.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Yang Shi <shy828301@gmail.com>, Zi Yan <ziy@nvidia.com>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: split thp synchronously on MADV_DONTNEED
Date: Tue, 23 Nov 2021 09:28:34 -0800 [thread overview]
Message-ID: <CALvZod6wyF7v1v888StoXSSWtb7ujaeBUnUB8Vs2RfMzUsj+Gw@mail.gmail.com> (raw)
In-Reply-To: <1b400921-8bef-8073-10f9-a7cbb09cfefe@redhat.com>
On Tue, Nov 23, 2021 at 9:26 AM David Hildenbrand <david@redhat.com> wrote:
>
> On 23.11.21 18:24, Shakeel Butt wrote:
> > On Tue, Nov 23, 2021 at 9:20 AM David Hildenbrand <david@redhat.com> wrote:
> >>
> >> On 23.11.21 18:17, Shakeel Butt wrote:
> >>> On Tue, Nov 23, 2021 at 8:57 AM David Hildenbrand <david@redhat.com> wrote:
> >>>>
> >>> [...]
> >>>>>>
> >>>>>> I do wonder which these locking contexts are exactly, and if we could
> >>>>>> also do the same thing on ordinary munmap -- because I assume it can be
> >>>>>> similarly problematic for some applications.
> >>>>>
> >>>>> This is a good question regarding munmap. One main difference is
> >>>>> munmap takes mmap_lock in write mode and usually performance critical
> >>>>> applications avoid such operations.
> >>>>
> >>>> Maybe we can extend it too most page zapping, if that makes things simpler.
> >>>>
> >>>
> >>> Do you mean doing sync THP split for most of page zapping functions
> >>> (but only if that makes things simpler)?
> >>>
> >>
> >> Yes -- if there are no downsides.
> >>
> >
> > I will try. At the moment the assumption of "Not null zap_details
> > implies leave swap entries" is giving me a headache.
>
> Not only you, did you stumble over
>
> https://lkml.kernel.org/r/20211115134951.85286-1-peterx@redhat.com
>
> already?
>
Oh thanks for the pointer. I missed that. I will take a look. Thanks again.
next prev parent reply other threads:[~2021-11-23 17:29 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-20 20:12 [PATCH] mm: split thp synchronously on MADV_DONTNEED Shakeel Butt
2021-11-21 4:35 ` Matthew Wilcox
2021-11-21 5:25 ` Shakeel Butt
2021-11-22 0:50 ` Kirill A. Shutemov
2021-11-22 3:42 ` Shakeel Butt
2021-11-22 4:56 ` Matthew Wilcox
2021-11-22 9:19 ` David Hildenbrand
2021-12-08 13:23 ` Pankaj Gupta
2021-11-22 8:32 ` David Hildenbrand
2021-11-22 18:40 ` Shakeel Butt
2021-11-22 18:59 ` David Hildenbrand
2021-11-23 1:20 ` Shakeel Butt
2021-11-23 16:56 ` David Hildenbrand
2021-11-23 17:17 ` Shakeel Butt
2021-11-23 17:20 ` David Hildenbrand
2021-11-23 17:24 ` Shakeel Butt
2021-11-23 17:26 ` David Hildenbrand
2021-11-23 17:28 ` Shakeel Butt [this message]
2021-11-25 10:09 ` Peter Xu
2021-11-25 17:14 ` Shakeel Butt
2021-11-26 0:00 ` Peter Xu
2021-11-25 10:24 ` Peter Xu
2021-11-25 10:32 ` David Hildenbrand
2021-11-26 2:52 ` Peter Xu
2021-11-26 9:04 ` David Hildenbrand
2021-11-29 22:00 ` Yang Shi
2021-11-26 3:21 ` Shakeel Butt
2021-11-26 4:12 ` Peter Xu
2021-11-26 9:16 ` David Hildenbrand
2021-11-26 9:39 ` Peter Xu
2021-11-29 21:32 ` Yang Shi
2022-01-24 18:48 ` David Rientjes
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