From: andrey.konovalov@linux.dev To: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com> Cc: Andrey Konovalov <andreyknvl@gmail.com>, Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev@googlegroups.com, Vincenzo Frascino <vincenzo.frascino@arm.com>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH v2 2/2] arm64: stacktrace: use non-atomic __set_bit Date: Mon, 23 May 2022 16:51:52 +0200 [thread overview] Message-ID: <23dfa36d1cc91e4a1059945b7834eac22fb9854d.1653317461.git.andreyknvl@google.com> (raw) In-Reply-To: <c4c944a2a905e949760fbeb29258185087171708.1653317461.git.andreyknvl@google.com> From: Andrey Konovalov <andreyknvl@google.com> Use the non-atomic version of set_bit() in arch/arm64/kernel/stacktrace.c, as there is no concurrent accesses to frame->prev_type. This speeds up stack trace collection and improves the boot time of Generic KASAN by 2-5%. Suggested-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- arch/arm64/kernel/stacktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index 33e96ae4b15f..03593d451b0a 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -103,7 +103,7 @@ static int notrace unwind_frame(struct task_struct *tsk, if (fp <= frame->prev_fp) return -EINVAL; } else { - set_bit(frame->prev_type, frame->stacks_done); + __set_bit(frame->prev_type, frame->stacks_done); } /* -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: andrey.konovalov@linux.dev To: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com> Cc: Andrey Konovalov <andreyknvl@gmail.com>, Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev@googlegroups.com, Vincenzo Frascino <vincenzo.frascino@arm.com>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH v2 2/2] arm64: stacktrace: use non-atomic __set_bit Date: Mon, 23 May 2022 16:51:52 +0200 [thread overview] Message-ID: <23dfa36d1cc91e4a1059945b7834eac22fb9854d.1653317461.git.andreyknvl@google.com> (raw) In-Reply-To: <c4c944a2a905e949760fbeb29258185087171708.1653317461.git.andreyknvl@google.com> From: Andrey Konovalov <andreyknvl@google.com> Use the non-atomic version of set_bit() in arch/arm64/kernel/stacktrace.c, as there is no concurrent accesses to frame->prev_type. This speeds up stack trace collection and improves the boot time of Generic KASAN by 2-5%. Suggested-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- arch/arm64/kernel/stacktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index 33e96ae4b15f..03593d451b0a 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -103,7 +103,7 @@ static int notrace unwind_frame(struct task_struct *tsk, if (fp <= frame->prev_fp) return -EINVAL; } else { - set_bit(frame->prev_type, frame->stacks_done); + __set_bit(frame->prev_type, frame->stacks_done); } /* -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-23 14:52 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-23 14:51 [PATCH v2 1/2] arm64: kasan: do not instrument stacktrace.c andrey.konovalov 2022-05-23 14:51 ` andrey.konovalov 2022-05-23 14:51 ` andrey.konovalov [this message] 2022-05-23 14:51 ` [PATCH v2 2/2] arm64: stacktrace: use non-atomic __set_bit andrey.konovalov 2022-06-23 19:31 ` [PATCH v2 1/2] arm64: kasan: do not instrument stacktrace.c Will Deacon 2022-06-23 19:31 ` Will Deacon 2022-06-26 9:21 ` Mark Rutland 2022-06-26 9:21 ` Mark Rutland 2022-06-28 13:14 ` Andrey Konovalov 2022-06-28 13:14 ` Andrey Konovalov
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=23dfa36d1cc91e4a1059945b7834eac22fb9854d.1653317461.git.andreyknvl@google.com \ --to=andrey.konovalov@linux.dev \ --cc=andreyknvl@gmail.com \ --cc=andreyknvl@google.com \ --cc=catalin.marinas@arm.com \ --cc=dvyukov@google.com \ --cc=elver@google.com \ --cc=glider@google.com \ --cc=kasan-dev@googlegroups.com \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=mark.rutland@arm.com \ --cc=ryabinin.a.a@gmail.com \ --cc=vincenzo.frascino@arm.com \ --cc=will@kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.