From: Peter Xu <peterx@redhat.com>
To: Suren Baghdasaryan <surenb@google.com>
Cc: Matthew Wilcox <willy@infradead.org>,
akpm@linux-foundation.org, hannes@cmpxchg.org, mhocko@suse.com,
josef@toxicpanda.com, jack@suse.cz, ldufour@linux.ibm.com,
laurent.dufour@fr.ibm.com, michel@lespinasse.org,
liam.howlett@oracle.com, jglisse@google.com, vbabka@suse.cz,
minchan@google.com, dave@stgolabs.net,
punit.agrawal@bytedance.com, lstoakes@gmail.com,
hdanton@sina.com, apopple@nvidia.com, ying.huang@intel.com,
david@redhat.com, yuzhao@google.com, dhowells@redhat.com,
hughd@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org,
pasha.tatashin@soleen.com, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@android.com
Subject: Re: [PATCH v2 2/6] mm: handle swap page faults under VMA lock if page is uncontended
Date: Mon, 12 Jun 2023 09:59:19 -0400 [thread overview]
Message-ID: <ZIcktx8DPYxtV2Sd@x1n> (raw)
In-Reply-To: <CAJuCfpFAh2KOhpCQ-4b+pzY+1GxOGk=eqj6pBj04gc_8eqB6QQ@mail.gmail.com>
On Fri, Jun 09, 2023 at 03:34:34PM -0700, Suren Baghdasaryan wrote:
> On Fri, Jun 9, 2023 at 1:45 PM Peter Xu <peterx@redhat.com> wrote:
> >
> > On Fri, Jun 09, 2023 at 09:35:49PM +0100, Matthew Wilcox wrote:
> > > On Fri, Jun 09, 2023 at 04:25:42PM -0400, Peter Xu wrote:
> > > > > bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
> > > > > unsigned int flags)
> > > > > {
> > > > > + /* Can't do this if not holding mmap_lock */
> > > > > + if (flags & FAULT_FLAG_VMA_LOCK)
> > > > > + return false;
> > > >
> > > > If here what we need is the page lock, can we just conditionally release
> > > > either mmap lock or vma lock depending on FAULT_FLAG_VMA_LOCK?
> > >
> > > See patch 5 ...
> >
> > Just reaching.. :)
> >
> > Why not in one shot, then?
>
> I like small incremental changes, but I can squash them if that helps
> in having a complete picture.
Yes that'll be appreciated. IMHO keeping changing semantics of
FAULT_FLAG_VMA_LOCK for the folio lock function in the same small series is
confusing.
--
Peter Xu
next prev parent reply other threads:[~2023-06-12 14:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 0:51 [PATCH v2 0/6] Per-vma lock support for swap and userfaults Suren Baghdasaryan
2023-06-09 0:51 ` [PATCH v2 1/6] swap: remove remnants of polling from read_swap_cache_async Suren Baghdasaryan
2023-06-09 1:57 ` Huang, Ying
2023-06-09 3:13 ` Ming Lei
2023-06-09 18:50 ` Suren Baghdasaryan
2023-06-12 4:53 ` Christoph Hellwig
2023-06-09 0:51 ` [PATCH v2 2/6] mm: handle swap page faults under VMA lock if page is uncontended Suren Baghdasaryan
2023-06-09 20:25 ` Peter Xu
2023-06-09 20:35 ` Matthew Wilcox
2023-06-09 20:45 ` Peter Xu
2023-06-09 22:34 ` Suren Baghdasaryan
2023-06-12 13:59 ` Peter Xu [this message]
2023-06-12 16:09 ` Suren Baghdasaryan
2023-06-09 0:51 ` [PATCH v2 3/6] mm: add missing VM_FAULT_RESULT_TRACE name for VM_FAULT_COMPLETED Suren Baghdasaryan
2023-06-09 20:34 ` Peter Xu
2023-06-09 0:51 ` [PATCH v2 4/6] mm: drop VMA lock before waiting for migration Suren Baghdasaryan
2023-06-09 20:42 ` Peter Xu
2023-06-09 22:30 ` Suren Baghdasaryan
2023-06-10 1:29 ` Suren Baghdasaryan
2023-06-12 13:36 ` Peter Xu
2023-06-12 16:07 ` Suren Baghdasaryan
2023-06-12 18:34 ` Peter Xu
2023-06-12 18:44 ` Suren Baghdasaryan
2023-06-12 18:57 ` Peter Xu
2023-06-12 13:28 ` Peter Xu
2023-06-12 15:41 ` Suren Baghdasaryan
2023-06-09 0:51 ` [PATCH v2 5/6] mm: implement folio wait under VMA lock Suren Baghdasaryan
2023-06-09 15:03 ` Matthew Wilcox
2023-06-09 18:49 ` Suren Baghdasaryan
2023-06-09 18:55 ` Suren Baghdasaryan
2023-06-09 19:36 ` Matthew Wilcox
2023-06-09 22:49 ` Suren Baghdasaryan
2023-06-09 20:54 ` Peter Xu
2023-06-09 22:48 ` Suren Baghdasaryan
2023-06-12 13:56 ` Peter Xu
2023-06-09 0:51 ` [PATCH v2 6/6] mm: handle userfaults " Suren Baghdasaryan
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