From: Valentin Schneider <vschneid@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
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Subject: Re: [RFC PATCH v2 05/20] tracing/filters: Optimise cpumask vs cpumask filtering when user mask is a single CPU
Date: Mon, 31 Jul 2023 12:20:13 +0100 [thread overview]
Message-ID: <xhsmh3514s4ya.mognet@vschneid.remote.csb> (raw)
In-Reply-To: <20230729153436.1e07bfa6@rorschach.local.home>
On 29/07/23 15:34, Steven Rostedt wrote:
> On Thu, 20 Jul 2023 17:30:41 +0100
> Valentin Schneider <vschneid@redhat.com> wrote:
>
>> /* Move along */
>> i++;
>> +
>> + /*
>> + * Optimisation: if the user-provided mask has a weight of one
>> + * then we can treat it as a scalar input.
>> + */
>> + single = cpumask_weight(pred->mask) == 1;
>> + if (single && field->filter_type == FILTER_CPUMASK) {
>> + pred->val = cpumask_first(pred->mask);
>> + kfree(pred->mask);
>
> Don't we need:
> pred->mask = NULL;
>
> here, or the free_predicate() will cause a double free?
>
We do, thanks for spotting this.
> -- Steve
>
>> + }
>> +
next prev parent reply other threads:[~2023-07-31 11:20 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-20 16:30 [RFC PATCH v2 00/20] context_tracking,x86: Defer some IPIs until a user->kernel transition Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 01/20] tracing/filters: Dynamically allocate filter_pred.regex Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 02/20] tracing/filters: Enable filtering a cpumask field by another cpumask Valentin Schneider
2023-07-26 19:41 ` Josh Poimboeuf
2023-07-27 9:46 ` Valentin Schneider
2023-07-29 19:09 ` Steven Rostedt
2023-07-31 11:19 ` Valentin Schneider
2023-07-31 15:48 ` Steven Rostedt
2023-07-20 16:30 ` [RFC PATCH v2 03/20] tracing/filters: Enable filtering a scalar field by a cpumask Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 04/20] tracing/filters: Enable filtering the CPU common " Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 05/20] tracing/filters: Optimise cpumask vs cpumask filtering when user mask is a single CPU Valentin Schneider
2023-07-29 19:34 ` Steven Rostedt
2023-07-31 11:20 ` Valentin Schneider [this message]
2023-07-20 16:30 ` [RFC PATCH v2 06/20] tracing/filters: Optimise scalar vs cpumask filtering when the " Valentin Schneider
2023-07-29 19:55 ` Steven Rostedt
2023-07-31 11:20 ` Valentin Schneider
2023-07-31 12:07 ` Dan Carpenter
2023-07-31 15:54 ` Steven Rostedt
2023-07-31 16:03 ` Dan Carpenter
2023-07-31 17:20 ` Valentin Schneider
2023-07-31 18:16 ` Steven Rostedt
2023-07-20 16:30 ` [RFC PATCH v2 07/20] tracing/filters: Optimise CPU " Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 08/20] tracing/filters: Further optimise scalar vs cpumask comparison Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 09/20] tracing/filters: Document cpumask filtering Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 10/20] jump_label,module: Don't alloc static_key_mod for __ro_after_init keys Valentin Schneider
2023-07-28 22:04 ` Peter Zijlstra
2023-07-20 16:30 ` [RFC PATCH v2 11/20] objtool: Flesh out warning related to pv_ops[] calls Valentin Schneider
2023-07-28 15:33 ` Josh Poimboeuf
2023-07-31 11:16 ` Valentin Schneider
2023-07-31 21:36 ` Josh Poimboeuf
2023-07-31 21:46 ` Peter Zijlstra
2023-08-01 16:06 ` Josh Poimboeuf
2023-08-01 18:12 ` Peter Zijlstra
2023-07-20 16:30 ` [RFC PATCH v2 12/20] objtool: Warn about non __ro_after_init static key usage in .noinstr Valentin Schneider
2023-07-28 15:35 ` Josh Poimboeuf
2023-07-31 11:18 ` Valentin Schneider
2023-07-28 16:02 ` Josh Poimboeuf
2023-07-31 11:18 ` Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 13/20] context_tracking: Make context_tracking_key __ro_after_init Valentin Schneider
2023-07-28 16:00 ` Josh Poimboeuf
2023-07-31 11:16 ` Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 14/20] x86/kvm: Make kvm_async_pf_enabled __ro_after_init Valentin Schneider
2023-10-09 16:40 ` Maxim Levitsky
2023-07-20 16:30 ` [RFC PATCH v2 15/20] context-tracking: Introduce work deferral infrastructure Valentin Schneider
2023-07-24 14:52 ` Frederic Weisbecker
2023-07-24 16:55 ` Valentin Schneider
2023-07-24 19:18 ` Frederic Weisbecker
2023-07-25 10:10 ` Valentin Schneider
2023-07-25 11:22 ` Frederic Weisbecker
2023-07-25 13:05 ` Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 16/20] rcu: Make RCU dynticks counter size configurable Valentin Schneider
2023-07-21 8:17 ` Valentin Schneider
2023-07-21 14:10 ` Paul E. McKenney
2023-07-21 15:08 ` Valentin Schneider
2023-07-21 16:09 ` Paul E. McKenney
2023-07-20 16:30 ` [RFC PATCH v2 17/20] rcutorture: Add a test config to torture test low RCU_DYNTICKS width Valentin Schneider
2023-07-20 19:53 ` Paul E. McKenney
2023-07-21 4:00 ` Paul E. McKenney
2023-07-21 7:58 ` Valentin Schneider
2023-07-21 14:07 ` Paul E. McKenney
2023-07-21 15:08 ` Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 18/20] context_tracking,x86: Defer kernel text patching IPIs Valentin Schneider
2023-07-25 10:49 ` Joel Fernandes
2023-07-25 13:36 ` Valentin Schneider
2023-07-25 17:41 ` Joel Fernandes
2023-07-25 13:39 ` Peter Zijlstra
2023-07-25 17:47 ` Joel Fernandes
2023-07-20 16:30 ` [RFC PATCH v2 19/20] context_tracking,x86: Add infrastructure to defer kernel TLBI Valentin Schneider
2023-07-20 16:30 ` [RFC PATCH v2 20/20] x86/mm, mm/vmalloc: Defer flush_tlb_kernel_range() targeting NOHZ_FULL CPUs Valentin Schneider
2023-07-21 18:15 ` Nadav Amit
2023-07-24 11:32 ` Valentin Schneider
2023-07-24 17:40 ` Dave Hansen
2023-07-25 13:21 ` Peter Zijlstra
2023-07-25 14:03 ` Valentin Schneider
2023-07-25 16:37 ` Marcelo Tosatti
2023-07-25 17:12 ` Dave Hansen
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