From: Suren Baghdasaryan <surenb@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andrii Nakryiko <andrii@kernel.org>,
linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org,
oleg@redhat.com, rostedt@goodmis.org, mhiramat@kernel.org,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
jolsa@kernel.org, paulmck@kernel.org, willy@infradead.org,
akpm@linux-foundation.org, mjguzik@gmail.com,
brauner@kernel.org, jannh@google.com, mhocko@kernel.org,
vbabka@suse.cz, shakeel.butt@linux.dev, hannes@cmpxchg.org,
Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com
Subject: Re: [PATCH v3 tip/perf/core 1/4] mm: introduce mmap_lock_speculation_{start|end}
Date: Thu, 24 Oct 2024 14:04:12 -0700 [thread overview]
Message-ID: <CAJuCfpGYzG+3aLjobsXcTSoo9Jo9MCYA_QcROPyLRKEeVHkLGA@mail.gmail.com> (raw)
In-Reply-To: <CAJuCfpGxu=z-2Wsf41-m4MQ6t7DjfiiWXD408BW8SjTfx0NGTg@mail.gmail.com>
On Thu, Oct 24, 2024 at 9:28 AM Suren Baghdasaryan <surenb@google.com> wrote:
>
> On Thu, Oct 24, 2024 at 2:57 AM Peter Zijlstra <peterz@infradead.org> wrote:
> >
> > On Wed, Oct 23, 2024 at 03:17:01PM -0700, Suren Baghdasaryan wrote:
> >
> > > > Or better yet, just use seqcount...
> > >
> > > Yeah, with these changes it does look a lot like seqcount now...
> > > I can take another stab at rewriting this using seqcount_t but one
> > > issue that Jann was concerned about is the counter being int vs long.
> > > seqcount_t uses unsigned, so I'm not sure how to address that if I
> > > were to use seqcount_t. Any suggestions how to address that before I
> > > move forward with a rewrite?
> >
> > So if that issue is real, it is not specific to this case. Specifically
> > preemptible seqcount will be similarly affected. So we should probably
> > address that in the seqcount implementation.
>
> Sounds good. Let me try rewriting this patch using seqcount_t and I'll
> work with Jann on a separate patch to change seqcount_t.
> Thanks for the feedback!
I posted the patchset to convert mm_lock_seq into seqcount_t and to
add speculative functions at
https://lore.kernel.org/all/20241024205231.1944747-1-surenb@google.com/.
>
> >
next prev parent reply other threads:[~2024-10-24 21:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-10 20:56 [PATCH v3 tip/perf/core 0/4] uprobes,mm: speculative lockless VMA-to-uprobe lookup Andrii Nakryiko
2024-10-10 20:56 ` [PATCH v3 tip/perf/core 1/4] mm: introduce mmap_lock_speculation_{start|end} Andrii Nakryiko
2024-10-13 7:56 ` Shakeel Butt
2024-10-14 20:27 ` Andrii Nakryiko
2024-10-14 20:48 ` Suren Baghdasaryan
2024-10-23 20:10 ` Peter Zijlstra
2024-10-23 22:17 ` Suren Baghdasaryan
2024-10-24 9:56 ` Peter Zijlstra
2024-10-24 16:28 ` Suren Baghdasaryan
2024-10-24 21:04 ` Suren Baghdasaryan [this message]
2024-10-24 23:20 ` Andrii Nakryiko
2024-10-24 23:33 ` Suren Baghdasaryan
2024-10-25 5:12 ` Andrii Nakryiko
2024-10-10 20:56 ` [PATCH v3 tip/perf/core 2/4] mm: switch to 64-bit mm_lock_seq/vm_lock_seq on 64-bit architectures Andrii Nakryiko
2024-10-13 7:56 ` Shakeel Butt
2024-10-17 2:01 ` Suren Baghdasaryan
2024-10-17 18:55 ` Andrii Nakryiko
2024-10-17 19:42 ` Suren Baghdasaryan
2024-10-17 20:12 ` Andrii Nakryiko
2024-10-23 19:02 ` Peter Zijlstra
2024-10-23 19:12 ` Andrii Nakryiko
2024-10-23 19:31 ` Peter Zijlstra
2024-10-10 20:56 ` [PATCH v3 tip/perf/core 3/4] uprobes: simplify find_active_uprobe_rcu() VMA checks Andrii Nakryiko
2024-10-10 20:56 ` [PATCH v3 tip/perf/core 4/4] uprobes: add speculative lockless VMA-to-inode-to-uprobe resolution Andrii Nakryiko
2024-10-11 5:01 ` Oleg Nesterov
2024-10-23 19:22 ` Peter Zijlstra
2024-10-23 20:02 ` Andrii Nakryiko
2024-10-23 20:19 ` Peter Zijlstra
2024-10-23 17:54 ` [PATCH v3 tip/perf/core 0/4] uprobes,mm: speculative lockless VMA-to-uprobe lookup Andrii Nakryiko
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