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Mon, 10 Aug 2026 02:40:35 -0700 (PDT) From: Xiang Gao X-Google-Original-From: Xiang Gao To: Steven Rostedt , Andrew Morton Cc: Masami Hiramatsu , Mathieu Desnoyers , David Hildenbrand , Lorenzo Stoakes , liam@infradead.org, Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Xiang Gao Subject: [PATCH] tracing: report buffer memory in /proc/meminfo Date: Mon, 10 Aug 2026 17:40:25 +0800 Message-Id: <20260810094025.136705-1-gaoxiang17@xiaomi.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: E6C68140011 X-Stat-Signature: h4e5uz6poo5bnq44nurbsraz3cya6rxd X-Rspam-User: X-HE-Tag: 1786354836-254287 X-HE-Meta: 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 IDPnTyrW nWXtb/m9s0ub3T/KsEMzzTQi3sxi6E8mx9OPbjkJgTUIwVyDA549sC/hYYlYrqSitaTAsjfQBYvy6hvrW37fPsbkzCPStj/FO0JGO6cxtFF5aFeVHa2UmqubTYIQBgQZ9/sM+QPnMwr/XeGfa53smPUwKsRj4HVcAsQWoZsYd2S8Q+Btl8ZvwLTFbx/6z2aP7zbP0wzcqtStXeq1/EA/wuYdESbrnTK4/vDjBEV4XbBI0okC6Vb8Buq/oQbaxAnL+ezedpm20JzzMCK37dJKju8RGLBwWsvTEvLvgcXgBjQonV4f3m0khARI7FQHlVzgTCSX3StIbaiEPB2cHMOeqNW9PEcYaQnDYyQQ6WLO6NVhSYvY1ZW4ckT8MJAA1XwOD0ia2NQjra/DcW173YmXtmLJ14Rv2xaKiEHkw Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Report the data capacity of all ftrace ring buffers through a new Ftrace field in /proc/meminfo. Include the main and snapshot buffers of the global trace array and all tracing instances, while leaving ring-buffer metadata accounted for by Slab. Keep the interface as a no-op when tracing is disabled so /proc/meminfo does not gain a configuration dependency on tracing. Tested on arm64 QEMU: CONFIG_TRACING=n: 0 kB Global resize/restore: 7 -> 4099 -> 7 kB Instance and snapshot lifecycle: 15 -> 1434 -> 2836 -> 1434 -> 15 kB Signed-off-by: Xiang Gao --- fs/proc/meminfo.c | 3 +++ include/linux/trace.h | 5 +++++ kernel/trace/trace.c | 30 ++++++++++++++++++++++++++++++ 3 files changed, 38 insertions(+) diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c index b2813ff13cb2..96a38ffc4e35 100644 --- a/fs/proc/meminfo.c +++ b/fs/proc/meminfo.c @@ -18,6 +18,7 @@ #include #endif #include +#include #include #include "internal.h" @@ -108,6 +109,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v) show_val_kb(m, "Slab: ", sreclaimable + sunreclaim); show_val_kb(m, "SReclaimable: ", sreclaimable); show_val_kb(m, "SUnreclaim: ", sunreclaim); + seq_printf(m, "Ftrace: %8lu kB\n", + ftrace_buffer_total_size() >> 10); seq_printf(m, "KernelStack: %8lu kB\n", global_node_page_state(NR_KERNEL_STACK_KB)); #ifdef CONFIG_SHADOW_CALL_STACK diff --git a/include/linux/trace.h b/include/linux/trace.h index 7eaad857dee0..f9935231560c 100644 --- a/include/linux/trace.h +++ b/include/linux/trace.h @@ -53,6 +53,7 @@ int trace_array_init_printk(struct trace_array *tr); void trace_array_put(struct trace_array *tr); struct trace_array *trace_array_get_by_name(const char *name, const char *systems); int trace_array_destroy(struct trace_array *tr); +unsigned long ftrace_buffer_total_size(void); /* For osnoise tracer */ int osnoise_arch_register(void); @@ -92,6 +93,10 @@ static inline int trace_array_destroy(struct trace_array *tr) { return 0; } +static inline unsigned long ftrace_buffer_total_size(void) +{ + return 0; +} #endif /* CONFIG_TRACING */ #endif /* _LINUX_TRACE_H */ diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 01a5e87af299..f0bb553e3688 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5769,6 +5769,36 @@ tracing_total_entries_read(struct file *filp, char __user *ubuf, return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } +static unsigned long trace_array_buffer_size(struct array_buffer *buf) +{ + unsigned long size = 0; + int cpu; + + if (!buf->buffer) + return 0; + + for_each_tracing_cpu(cpu) + size += ring_buffer_size(buf->buffer, cpu); + + return size; +} + +unsigned long ftrace_buffer_total_size(void) +{ + struct trace_array *tr; + unsigned long size = 0; + + guard(mutex)(&trace_types_lock); + list_for_each_entry(tr, &ftrace_trace_arrays, list) { + size += trace_array_buffer_size(&tr->array_buffer); +#ifdef CONFIG_TRACER_SNAPSHOT + size += trace_array_buffer_size(&tr->snapshot_buffer); +#endif + } + + return size; +} + #define LAST_BOOT_HEADER ((void *)1) static void *l_next(struct seq_file *m, void *v, loff_t *pos) -- 2.34.1