From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
To: Mark Brown <broonie@kernel.org>
Cc: mark.rutland@arm.com, jpoimboe@redhat.com, ardb@kernel.org,
nobuta.keiya@fujitsu.com, sjitindarsingh@gmail.com,
catalin.marinas@arm.com, will@kernel.org, jmorris@namei.org,
linux-arm-kernel@lists.infradead.org,
live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v10 02/11] arm64: Make perf_callchain_kernel() use arch_stack_walk()
Date: Thu, 21 Oct 2021 07:28:46 -0500 [thread overview]
Message-ID: <f528a0d2-3fc5-771d-4249-cc1a9685d4ae@linux.microsoft.com> (raw)
In-Reply-To: <YXAu2aXqBU3rO5e+@sirena.org.uk>
On 10/20/21 9:59 AM, Mark Brown wrote:
> On Thu, Oct 14, 2021 at 09:58:38PM -0500, madvenka@linux.microsoft.com wrote:
>> From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
>>
>> Currently, perf_callchain_kernel() in ARM64 code walks the stack using
>> start_backtrace() and walk_stackframe(). Make it use arch_stack_walk()
>> instead. This makes maintenance easier.
>
>> static bool callchain_trace(void *data, unsigned long pc)
>> {
>> struct perf_callchain_entry_ctx *entry = data;
>> - perf_callchain_store(entry, pc);
>> - return true;
>> + return perf_callchain_store(entry, pc) == 0;
>> }
>
> This changes us from unconditionally doing the whole walk to returning
> an error if perf_callchain_store() returns an error so it's not quite a
> straight transform, though since that seems like a useful improvement
> which most likely on't have any practical impact that's fine.
>
> Reviewed-by: Mark Brown <broonie@kernel.org>
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
Thanks.
Madhavan
next prev parent reply other threads:[~2021-10-21 12:28 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c05ce30dcc9be1bd6b5e24a2ca8fe1d66246980b>
2021-10-15 2:34 ` [PATCH v9 00/11] arm64: Reorganize the unwinder and implement stack trace reliability checks madvenka
2021-10-15 2:34 ` [PATCH v9 01/11] arm64: Select STACKTRACE in arch/arm64/Kconfig madvenka
2021-10-15 2:34 ` [PATCH v9 10/11] arm64: Introduce stack trace reliability checks in the unwinder madvenka
2021-10-15 2:34 ` [PATCH v9 11/11] arm64: Create a list of SYM_CODE functions, check return PC against list madvenka
2021-10-15 2:34 ` [PATCH v9 02/11] arm64: Make perf_callchain_kernel() use arch_stack_walk() madvenka
2021-10-15 2:34 ` [PATCH v9 03/11] arm64: Make get_wchan() " madvenka
2021-10-15 2:34 ` [PATCH v9 04/11] arm64: Make return_address() " madvenka
2021-10-15 2:34 ` [PATCH v9 05/11] arm64: Make dump_stacktrace() " madvenka
2021-10-15 2:34 ` [PATCH v9 06/11] arm64: Make profile_pc() " madvenka
2021-10-15 2:34 ` [PATCH v9 07/11] arm64: Call stack_backtrace() only from within walk_stackframe() madvenka
2021-10-15 2:34 ` [PATCH v9 08/11] arm64: Rename unwinder functions, prevent them from being traced and kprobed madvenka
2021-10-15 2:34 ` [PATCH v9 09/11] arm64: Make the unwind loop in unwind() similar to other architectures madvenka
2021-10-15 2:53 ` [PATCH v9 00/11] arm64: Reorganize the unwinder and implement stack trace reliability checks Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 " madvenka
2021-10-15 2:58 ` [PATCH v10 01/11] arm64: Select STACKTRACE in arch/arm64/Kconfig madvenka
2021-10-15 18:28 ` Mark Brown
2021-10-21 12:28 ` Madhavan T. Venkataraman
2021-10-22 18:02 ` Mark Rutland
2021-11-12 17:44 ` Mark Rutland
2021-11-14 16:15 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 02/11] arm64: Make perf_callchain_kernel() use arch_stack_walk() madvenka
2021-10-20 14:59 ` Mark Brown
2021-10-21 12:28 ` Madhavan T. Venkataraman [this message]
2021-10-22 18:11 ` Mark Rutland
2021-10-23 12:49 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 03/11] arm64: Make get_wchan() " madvenka
2021-10-20 16:10 ` Mark Brown
2021-10-21 12:30 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 04/11] arm64: Make return_address() " madvenka
2021-10-20 15:03 ` Mark Brown
2021-10-21 12:29 ` Madhavan T. Venkataraman
2021-10-22 18:51 ` Mark Rutland
2021-10-23 12:51 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 05/11] arm64: Make dump_stacktrace() " madvenka
2021-10-25 16:49 ` Mark Rutland
2021-10-26 12:05 ` Mark Rutland
2021-10-27 16:09 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 06/11] arm64: Make profile_pc() " madvenka
2021-10-25 2:18 ` nobuta.keiya
2021-10-27 16:10 ` Madhavan T. Venkataraman
2021-10-27 13:32 ` Mark Rutland
2021-10-27 16:15 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 07/11] arm64: Call stack_backtrace() only from within walk_stackframe() madvenka
2021-10-15 2:58 ` [PATCH v10 08/11] arm64: Rename unwinder functions, prevent them from being traced and kprobed madvenka
2021-10-27 17:53 ` Mark Rutland
2021-10-27 20:07 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 09/11] arm64: Make the unwind loop in unwind() similar to other architectures madvenka
2021-10-15 2:58 ` [PATCH v10 10/11] arm64: Introduce stack trace reliability checks in the unwinder madvenka
2021-11-04 12:39 ` nobuta.keiya
2021-11-10 3:13 ` Madhavan T. Venkataraman
2021-10-15 2:58 ` [PATCH v10 11/11] arm64: Create a list of SYM_CODE functions, check return PC against list madvenka
2021-10-15 17:00 ` [PATCH v10 00/11] arm64: Reorganize the unwinder and implement stack trace reliability checks Madhavan T. Venkataraman
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