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Tue, 09 Sep 2025 22:26:04 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , "Naveen N . Rao" , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Steven Rostedt , Mathieu Desnoyers , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jinchao Wang Subject: [PATCH v3 08/19] mm/ksw: support CPU hotplug Date: Wed, 10 Sep 2025 13:23:17 +0800 Message-ID: <20250910052335.1151048-9-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250910052335.1151048-1-wangjinchao600@gmail.com> References: <20250910052335.1151048-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B97751C0003 X-Rspamd-Server: rspam05 X-Stat-Signature: qutc3stdyc789kmzt3amtk96qdjbenfj X-Rspam-User: X-HE-Tag: 1757481965-270544 X-HE-Meta: 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 2n71j6Y8 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Register CPU online/offline callbacks via cpuhp_setup_state_nocalls() so stack watches are installed/removed dynamically as CPUs come online or go offline. Signed-off-by: Jinchao Wang --- mm/kstackwatch/watch.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/mm/kstackwatch/watch.c b/mm/kstackwatch/watch.c index e02ffc3231ad..d95efefdffe9 100644 --- a/mm/kstackwatch/watch.c +++ b/mm/kstackwatch/watch.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -67,6 +68,32 @@ static void ksw_watch_on_local_cpu(void *data) } } +static int ksw_cpu_online(unsigned int cpu) +{ + struct perf_event *bp; + + bp = perf_event_create_kernel_counter(&watch_attr, cpu, NULL, + ksw_watch_handler, NULL); + if (IS_ERR(bp)) { + pr_err("Failed to create watch on CPU %d: %ld\n", cpu, + PTR_ERR(bp)); + return PTR_ERR(bp); + } + + per_cpu(*watch_events, cpu) = bp; + per_cpu(watch_csd, cpu) = CSD_INIT(ksw_watch_on_local_cpu, NULL); + return 0; +} + +static int ksw_cpu_offline(unsigned int cpu) +{ + struct perf_event *bp = per_cpu(*watch_events, cpu); + + if (bp) + unregister_hw_breakpoint(bp); + return 0; +} + int ksw_watch_on(u64 watch_addr, u64 watch_len) { unsigned long flags; @@ -141,6 +168,15 @@ int ksw_watch_init(void) return ret; } + ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "kstackwatch:online", ksw_cpu_online, + ksw_cpu_offline); + if (ret < 0) { + unregister_wide_hw_breakpoint(watch_events); + pr_err("Failed to register CPU hotplug notifier\n"); + return ret; + } + return 0; } -- 2.43.0