From: Oleg Nesterov <oleg@redhat.com>
To: Andrii Nakryiko <andrii@kernel.org>
Cc: linux-trace-kernel@vger.kernel.org, peterz@infradead.org,
rostedt@goodmis.org, mhiramat@kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org, jolsa@kernel.org,
paulmck@kernel.org
Subject: Re: [PATCH 7/8] uprobes: perform lockless SRCU-protected uprobes_tree lookup
Date: Sat, 10 Aug 2024 16:00:15 +0200 [thread overview]
Message-ID: <20240810140015.GA21800@redhat.com> (raw)
In-Reply-To: <20240808134007.GE8020@redhat.com>
On 08/08, Oleg Nesterov wrote:
>
> On 07/31, Andrii Nakryiko wrote:
> >
> > static DEFINE_RWLOCK(uprobes_treelock); /* serialize rbtree access */
> > +static seqcount_rwlock_t uprobes_seqcount = SEQCNT_RWLOCK_ZERO(uprobes_seqcount, &uprobes_treelock);
>
> Just noticed... Why seqcount_rwlock_t?
>
> find_uprobe_rcu() doesn't use read_seqbegin_or_lock(),
> seqcount_t should work just fine.
Please ignore... I forgot that seqcount_t is not CONFIG_PREEMPT_RT-friendly.
Hmm. __seqprop_preemptible() returns 0, this doesn't look right... Nevermend.
Oleg.
next prev parent reply other threads:[~2024-08-10 14:00 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-31 21:42 [PATCH 0/8] uprobes: RCU-protected hot path optimizations Andrii Nakryiko
2024-07-31 21:42 ` [PATCH 1/8] rbtree: provide rb_find_rcu() / rb_find_add_rcu() Andrii Nakryiko
2024-07-31 21:42 ` [PATCH 2/8] uprobes: revamp uprobe refcounting and lifetime management Andrii Nakryiko
2024-08-01 11:09 ` Jiri Olsa
2024-08-01 16:49 ` Andrii Nakryiko
2024-08-01 22:07 ` Andrii Nakryiko
2024-08-02 8:50 ` Oleg Nesterov
2024-08-02 14:58 ` Andrii Nakryiko
2024-08-02 22:19 ` Oleg Nesterov
2024-08-02 11:11 ` Jiri Olsa
2024-08-02 15:03 ` Andrii Nakryiko
2024-08-05 13:44 ` Oleg Nesterov
2024-08-05 17:29 ` Andrii Nakryiko
2024-08-06 10:45 ` Oleg Nesterov
2024-07-31 21:42 ` [PATCH 3/8] uprobes: protected uprobe lifetime with SRCU Andrii Nakryiko
2024-08-01 12:23 ` Liao, Chang
2024-08-01 16:49 ` Andrii Nakryiko
2024-08-02 1:30 ` Liao, Chang
2024-08-05 14:51 ` Oleg Nesterov
2024-08-05 17:31 ` Andrii Nakryiko
2024-07-31 21:42 ` [PATCH 4/8] uprobes: get rid of enum uprobe_filter_ctx in uprobe filter callbacks Andrii Nakryiko
2024-07-31 21:42 ` [PATCH 5/8] uprobes: travers uprobe's consumer list locklessly under SRCU protection Andrii Nakryiko
2024-08-01 14:27 ` Jiri Olsa
2024-08-01 16:49 ` Andrii Nakryiko
2024-08-05 15:59 ` Oleg Nesterov
2024-08-05 17:31 ` Andrii Nakryiko
2024-08-06 10:54 ` Oleg Nesterov
2024-07-31 21:42 ` [PATCH 6/8] perf/uprobe: split uprobe_unregister() Andrii Nakryiko
2024-08-02 2:41 ` Liao, Chang
2024-08-02 15:05 ` Andrii Nakryiko
2024-08-05 20:01 ` Andrii Nakryiko
2024-08-06 1:50 ` Liao, Chang
2024-08-07 13:17 ` Oleg Nesterov
2024-08-07 15:24 ` Andrii Nakryiko
2024-07-31 21:42 ` [PATCH 7/8] uprobes: perform lockless SRCU-protected uprobes_tree lookup Andrii Nakryiko
2024-08-07 17:14 ` Andrii Nakryiko
2024-08-08 10:04 ` Oleg Nesterov
2024-08-08 14:29 ` Oleg Nesterov
2024-08-08 17:00 ` Andrii Nakryiko
2024-08-08 13:40 ` Oleg Nesterov
2024-08-10 14:00 ` Oleg Nesterov [this message]
2024-07-31 21:42 ` [PATCH 8/8] uprobes: switch to RCU Tasks Trace flavor for better performance Andrii Nakryiko
2024-08-01 9:35 ` Peter Zijlstra
2024-08-01 16:49 ` Andrii Nakryiko
2024-08-01 18:05 ` Paul E. McKenney
2024-08-07 13:29 ` [PATCH 0/8] uprobes: RCU-protected hot path optimizations Oleg Nesterov
2024-08-07 15:24 ` Andrii Nakryiko
2024-08-07 17:11 ` Oleg Nesterov
2024-08-07 17:31 ` Andrii Nakryiko
2024-08-07 18:24 ` Oleg Nesterov
2024-08-08 7:51 ` Liao, Chang
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