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Mon, 10 Nov 2025 08:37:57 -0800 (PST) From: Jinchao Wang To: Andrew Morton , "Masami Hiramatsu (Google)" , Peter Zijlstra , Randy Dunlap , Marco Elver , Mike Rapoport , Alexander Potapenko , Adrian Hunter , Alexander Shishkin , Alice Ryhl , Andrey Konovalov , Andrey Ryabinin , Andrii Nakryiko , Ard Biesheuvel , Arnaldo Carvalho de Melo , Ben Segall , Bill Wendling , Borislav Petkov , Catalin Marinas , Dave Hansen , David Hildenbrand , David Kaplan , "David S. Miller" , Dietmar Eggemann , Dmitry Vyukov , "H. Peter Anvin" , Ian Rogers , Ingo Molnar , James Clark , Jinchao Wang , Jinjie Ruan , Jiri Olsa , Jonathan Corbet , Juri Lelli , Justin Stitt , kasan-dev@googlegroups.com, Kees Cook , "Liam R. Howlett" , "Liang Kan" , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev, Lorenzo Stoakes , Mark Rutland , Masahiro Yamada , Mathieu Desnoyers , Mel Gorman , Michal Hocko , Miguel Ojeda , Nam Cao , Namhyung Kim , Nathan Chancellor , Naveen N Rao , Nick Desaulniers , Rong Xu , Sami Tolvanen , Steven Rostedt , Suren Baghdasaryan , Thomas Gleixner , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Valentin Schneider , Vincent Guittot , Vincenzo Frascino , Vlastimil Babka , Will Deacon , workflows@vger.kernel.org, x86@kernel.org Subject: [PATCH v8 17/27] mm/ksw: add KSTACKWATCH_PROFILING to measure probe cost Date: Tue, 11 Nov 2025 00:36:12 +0800 Message-ID: <20251110163634.3686676-18-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251110163634.3686676-1-wangjinchao600@gmail.com> References: <20251110163634.3686676-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: 2519A40002 X-Stat-Signature: knjpa6zocgdcw383f176rfhmiojqyz7x X-HE-Tag: 1762792678-191064 X-HE-Meta: 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 gl5WC4x/ 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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: CONFIG_KSTACKWATCH_PROFILING enables runtime measurement of KStackWatch probe latencies. When profiling is enabled, KStackWatch collects entry/exit latencies in its probe callbacks. When KStackWatch is disabled by clearing its config file, the previously collected statistics are printed. Signed-off-by: Jinchao Wang --- mm/kstackwatch/Kconfig | 10 +++ mm/kstackwatch/stack.c | 185 ++++++++++++++++++++++++++++++++++++++--- 2 files changed, 183 insertions(+), 12 deletions(-) diff --git a/mm/kstackwatch/Kconfig b/mm/kstackwatch/Kconfig index 496caf264f35..3c9385a15c33 100644 --- a/mm/kstackwatch/Kconfig +++ b/mm/kstackwatch/Kconfig @@ -12,3 +12,13 @@ config KSTACKWATCH introduce minor overhead during runtime monitoring. If unsure, say N. + +config KSTACKWATCH_PROFILING + bool "KStackWatch profiling" + depends on KSTACKWATCH + help + Measure probe latency and overhead in KStackWatch. It records + entry/exit probe times (ns and cycles) and shows statistics when + stopping. Useful for performance tuning, not for production use. + + If unsure, say N. diff --git a/mm/kstackwatch/stack.c b/mm/kstackwatch/stack.c index 3455d1e70db9..72ae2d3adeec 100644 --- a/mm/kstackwatch/stack.c +++ b/mm/kstackwatch/stack.c @@ -6,7 +6,10 @@ #include #include #include +#include +#include #include +#include #define MAX_CANARY_SEARCH_STEPS 128 static struct kprobe entry_probe; @@ -15,6 +18,120 @@ static struct fprobe exit_probe; static bool probe_enable; static u16 probe_generation; +#ifdef CONFIG_KSTACKWATCH_PROFILING +struct measure_data { + u64 total_entry_with_watch_ns; + u64 total_entry_with_watch_cycles; + u64 total_entry_without_watch_ns; + u64 total_entry_without_watch_cycles; + u64 total_exit_with_watch_ns; + u64 total_exit_with_watch_cycles; + u64 total_exit_without_watch_ns; + u64 total_exit_without_watch_cycles; + u64 entry_with_watch_count; + u64 entry_without_watch_count; + u64 exit_with_watch_count; + u64 exit_without_watch_count; +}; + +static DEFINE_PER_CPU(struct measure_data, measure_stats); + +struct measure_ctx { + u64 ns_start; + u64 cycles_start; +}; + +static __always_inline void measure_start(struct measure_ctx *ctx) +{ + ctx->ns_start = ktime_get_ns(); + ctx->cycles_start = get_cycles(); +} + +static __always_inline void measure_end(struct measure_ctx *ctx, u64 *total_ns, + u64 *total_cycles, u64 *count) +{ + u64 ns_end = ktime_get_ns(); + u64 c_end = get_cycles(); + + *total_ns += ns_end - ctx->ns_start; + *total_cycles += c_end - ctx->cycles_start; + (*count)++; +} + +static void show_measure_stats(void) +{ + int cpu; + struct measure_data sum = {}; + + for_each_possible_cpu(cpu) { + struct measure_data *md = per_cpu_ptr(&measure_stats, cpu); + + sum.total_entry_with_watch_ns += md->total_entry_with_watch_ns; + sum.total_entry_with_watch_cycles += + md->total_entry_with_watch_cycles; + sum.total_entry_without_watch_ns += + md->total_entry_without_watch_ns; + sum.total_entry_without_watch_cycles += + md->total_entry_without_watch_cycles; + + sum.total_exit_with_watch_ns += md->total_exit_with_watch_ns; + sum.total_exit_with_watch_cycles += + md->total_exit_with_watch_cycles; + sum.total_exit_without_watch_ns += + md->total_exit_without_watch_ns; + sum.total_exit_without_watch_cycles += + md->total_exit_without_watch_cycles; + + sum.entry_with_watch_count += md->entry_with_watch_count; + sum.entry_without_watch_count += md->entry_without_watch_count; + sum.exit_with_watch_count += md->exit_with_watch_count; + sum.exit_without_watch_count += md->exit_without_watch_count; + } + +#define AVG(ns, cnt) ((cnt) ? ((ns) / (cnt)) : 0ULL) + + pr_info("entry (with watch): %llu ns, %llu cycles (%llu samples)\n", + AVG(sum.total_entry_with_watch_ns, sum.entry_with_watch_count), + AVG(sum.total_entry_with_watch_cycles, + sum.entry_with_watch_count), + sum.entry_with_watch_count); + + pr_info("entry (without watch): %llu ns, %llu cycles (%llu samples)\n", + AVG(sum.total_entry_without_watch_ns, + sum.entry_without_watch_count), + AVG(sum.total_entry_without_watch_cycles, + sum.entry_without_watch_count), + sum.entry_without_watch_count); + + pr_info("exit (with watch): %llu ns, %llu cycles (%llu samples)\n", + AVG(sum.total_exit_with_watch_ns, sum.exit_with_watch_count), + AVG(sum.total_exit_with_watch_cycles, + sum.exit_with_watch_count), + sum.exit_with_watch_count); + + pr_info("exit (without watch): %llu ns, %llu cycles (%llu samples)\n", + AVG(sum.total_exit_without_watch_ns, + sum.exit_without_watch_count), + AVG(sum.total_exit_without_watch_cycles, + sum.exit_without_watch_count), + sum.exit_without_watch_count); +} + +static void reset_measure_stats(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct measure_data *md = per_cpu_ptr(&measure_stats, cpu); + + memset(md, 0, sizeof(*md)); + } + + pr_info("measure stats reset.\n"); +} + +#endif + static void ksw_reset_ctx(void) { struct ksw_ctx *ctx = ¤t->ksw_ctx; @@ -159,25 +276,28 @@ static void ksw_stack_entry_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) { struct ksw_ctx *ctx = ¤t->ksw_ctx; - ulong stack_pointer; - ulong watch_addr; + ulong stack_pointer, watch_addr; u16 watch_len; int ret; +#ifdef CONFIG_KSTACKWATCH_PROFILING + struct measure_ctx m; + struct measure_data *md = this_cpu_ptr(&measure_stats); + bool watched = false; + + measure_start(&m); +#endif stack_pointer = kernel_stack_pointer(regs); - /* - * triggered more than once, may be in a loop - */ if (ctx->wp && ctx->sp == stack_pointer) - return; + goto out; if (!ksw_stack_check_ctx(true)) - return; + goto out; ret = ksw_watch_get(&ctx->wp); if (ret) - return; + goto out; ret = ksw_stack_prepare_watch(regs, ksw_get_config(), &watch_addr, &watch_len); @@ -185,17 +305,32 @@ static void ksw_stack_entry_handler(struct kprobe *p, struct pt_regs *regs, ksw_watch_off(ctx->wp); ctx->wp = NULL; pr_err("failed to prepare watch target: %d\n", ret); - return; + goto out; } ret = ksw_watch_on(ctx->wp, watch_addr, watch_len); if (ret) { pr_err("failed to watch on depth:%d addr:0x%lx len:%u %d\n", ksw_get_config()->depth, watch_addr, watch_len, ret); - return; + goto out; } ctx->sp = stack_pointer; +#ifdef CONFIG_KSTACKWATCH_PROFILING + watched = true; +#endif + +out: +#ifdef CONFIG_KSTACKWATCH_PROFILING + if (watched) + measure_end(&m, &md->total_entry_with_watch_ns, + &md->total_entry_with_watch_cycles, + &md->entry_with_watch_count); + else + measure_end(&m, &md->total_entry_without_watch_ns, + &md->total_entry_without_watch_cycles, + &md->entry_without_watch_count); +#endif } static void ksw_stack_exit_handler(struct fprobe *fp, unsigned long ip, @@ -203,15 +338,36 @@ static void ksw_stack_exit_handler(struct fprobe *fp, unsigned long ip, struct ftrace_regs *regs, void *data) { struct ksw_ctx *ctx = ¤t->ksw_ctx; +#ifdef CONFIG_KSTACKWATCH_PROFILING + struct measure_ctx m; + struct measure_data *md = this_cpu_ptr(&measure_stats); + bool watched = false; + measure_start(&m); +#endif if (!ksw_stack_check_ctx(false)) - return; + goto out; if (ctx->wp) { ksw_watch_off(ctx->wp); ctx->wp = NULL; ctx->sp = 0; +#ifdef CONFIG_KSTACKWATCH_PROFILING + watched = true; +#endif } + +out: +#ifdef CONFIG_KSTACKWATCH_PROFILING + if (watched) + measure_end(&m, &md->total_exit_with_watch_ns, + &md->total_exit_with_watch_cycles, + &md->exit_with_watch_count); + else + measure_end(&m, &md->total_exit_without_watch_ns, + &md->total_exit_without_watch_cycles, + &md->exit_without_watch_count); +#endif } int ksw_stack_init(void) @@ -239,7 +395,9 @@ int ksw_stack_init(void) unregister_kprobe(&entry_probe); return ret; } - +#ifdef CONFIG_KSTACKWATCH_PROFILING + reset_measure_stats(); +#endif WRITE_ONCE(probe_generation, READ_ONCE(probe_generation) + 1); WRITE_ONCE(probe_enable, true); @@ -252,4 +410,7 @@ void ksw_stack_exit(void) WRITE_ONCE(probe_generation, READ_ONCE(probe_generation) + 1); unregister_fprobe(&exit_probe); unregister_kprobe(&entry_probe); +#ifdef CONFIG_KSTACKWATCH_PROFILING + show_measure_stats(); +#endif } -- 2.43.0