From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Masami Hiramatsu <mhiramat@kernel.org>
Subject: [for-next][PATCH 23/26] tracing/boot: Add cpu_mask option support
Date: Tue, 14 Jan 2020 16:03:39 -0500 [thread overview]
Message-ID: <20200114210339.056588583@goodmis.org> (raw)
In-Reply-To: 20200114210316.450821675@goodmis.org
From: Masami Hiramatsu <mhiramat@kernel.org>
Add ftrace.cpumask option support to boot-time tracing.
This sets cpumask for each instance.
- ftrace.[instance.INSTANCE.]cpumask = CPUMASK;
Set the trace cpumask. Note that the CPUMASK should be a string
which <tracefs>/tracing_cpumask can accepts.
Link: http://lkml.kernel.org/r/157867243625.17873.13613922641273149372.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace.c | 42 +++++++++++++++++++++++++++------------
kernel/trace/trace_boot.c | 14 +++++++++++++
2 files changed, 43 insertions(+), 13 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6c996d1b1687..106bbc0988fe 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4561,20 +4561,13 @@ tracing_cpumask_read(struct file *filp, char __user *ubuf,
return count;
}
-static ssize_t
-tracing_cpumask_write(struct file *filp, const char __user *ubuf,
- size_t count, loff_t *ppos)
+int tracing_set_cpumask(struct trace_array *tr,
+ cpumask_var_t tracing_cpumask_new)
{
- struct trace_array *tr = file_inode(filp)->i_private;
- cpumask_var_t tracing_cpumask_new;
- int err, cpu;
-
- if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
- return -ENOMEM;
+ int cpu;
- err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
- if (err)
- goto err_unlock;
+ if (!tr)
+ return -EINVAL;
local_irq_disable();
arch_spin_lock(&tr->max_lock);
@@ -4598,11 +4591,34 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
local_irq_enable();
cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new);
+
+ return 0;
+}
+
+static ssize_t
+tracing_cpumask_write(struct file *filp, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct trace_array *tr = file_inode(filp)->i_private;
+ cpumask_var_t tracing_cpumask_new;
+ int err;
+
+ if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
+ return -ENOMEM;
+
+ err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
+ if (err)
+ goto err_free;
+
+ err = tracing_set_cpumask(tr, tracing_cpumask_new);
+ if (err)
+ goto err_free;
+
free_cpumask_var(tracing_cpumask_new);
return count;
-err_unlock:
+err_free:
free_cpumask_var(tracing_cpumask_new);
return err;
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index f5db30d25b0b..81d923c16a4d 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -18,6 +18,8 @@ extern int trace_set_options(struct trace_array *tr, char *option);
extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
unsigned long size, int cpu_id);
+extern int tracing_set_cpumask(struct trace_array *tr,
+ cpumask_var_t tracing_cpumask_new);
static void __init
trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
@@ -52,6 +54,18 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
if (tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0)
pr_err("Failed to resize trace buffer to %s\n", p);
}
+
+ p = xbc_node_find_value(node, "cpumask", NULL);
+ if (p && *p != '\0') {
+ cpumask_var_t new_mask;
+
+ if (alloc_cpumask_var(&new_mask, GFP_KERNEL)) {
+ if (cpumask_parse(p, new_mask) < 0 ||
+ tracing_set_cpumask(tr, new_mask) < 0)
+ pr_err("Failed to set new CPU mask %s\n", p);
+ free_cpumask_var(new_mask);
+ }
+ }
}
#ifdef CONFIG_EVENT_TRACING
--
2.24.1
next prev parent reply other threads:[~2020-01-14 21:04 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 21:03 [for-next][PATCH 00/26] tracing: Updates for 5.6 Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 01/26] perf: Make struct ring_buffer less ambiguous Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 02/26] tracing: Rename trace_buffer to array_buffer Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 03/26] tracing: Make struct ring_buffer less ambiguous Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 04/26] bootconfig: Add Extra Boot Config support Steven Rostedt
2020-02-06 11:54 ` Borislav Petkov
2020-02-06 14:41 ` Masami Hiramatsu
2020-02-06 17:20 ` Geert Uytterhoeven
2020-02-07 0:30 ` Masami Hiramatsu
2020-02-07 8:49 ` Geert Uytterhoeven
2020-02-07 13:17 ` Masami Hiramatsu
2020-02-07 14:28 ` [PATCH] bootconfig: Allocate xbc_nodes array dynamically Masami Hiramatsu
2020-02-06 17:58 ` [for-next][PATCH 04/26] bootconfig: Add Extra Boot Config support Borislav Petkov
2020-02-06 18:10 ` Randy Dunlap
2020-02-06 22:39 ` Steven Rostedt
2020-02-06 22:51 ` Borislav Petkov
2020-02-07 8:59 ` Geert Uytterhoeven
2020-02-07 2:46 ` Masami Hiramatsu
2020-02-07 11:41 ` Borislav Petkov
2020-02-07 15:06 ` Masami Hiramatsu
2020-02-10 11:25 ` Borislav Petkov
2020-02-10 15:10 ` Masami Hiramatsu
2020-02-10 17:40 ` Borislav Petkov
2020-02-11 2:02 ` Masami Hiramatsu
2020-02-18 13:27 ` Borislav Petkov
2020-02-18 17:57 ` Steven Rostedt
2020-02-18 19:38 ` Borislav Petkov
2020-02-19 2:26 ` Masami Hiramatsu
2020-02-19 2:26 ` Masami Hiramatsu
2020-02-19 2:26 ` Masami Hiramatsu
2020-02-11 9:25 ` Geert Uytterhoeven
2020-01-14 21:03 ` [for-next][PATCH 05/26] bootconfig: Load boot config from the tail of initrd Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 06/26] tools: bootconfig: Add bootconfig command Steven Rostedt
2020-02-07 13:02 ` Michael Ellerman
2020-02-07 13:39 ` Masami Hiramatsu
2020-02-07 13:55 ` [PATCH] tools/bootconfig: Fix wrong __VA_ARGS__ usage Masami Hiramatsu
2020-02-08 11:10 ` Michael Ellerman
2020-02-09 4:09 ` Masami Hiramatsu
2020-02-09 13:05 ` [PATCH] tools/bootconfig: Suppress non-error messages Masami Hiramatsu
2020-02-10 2:06 ` Michael Ellerman
2020-02-10 7:18 ` Masami Hiramatsu
2020-02-10 9:50 ` Michael Ellerman
2020-02-10 9:50 ` [PATCH] tools/bootconfig: Fix wrong __VA_ARGS__ usage Michael Ellerman
2020-02-10 17:07 ` Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 07/26] tools: bootconfig: Add bootconfig test script Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 08/26] proc: bootconfig: Add /proc/bootconfig to show boot config list Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 09/26] init/main.c: Alloc initcall_command_line in do_initcall() and free it Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 10/26] bootconfig: init: Allow admin to use bootconfig for kernel command line Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 11/26] bootconfig: init: Allow admin to use bootconfig for init " Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 12/26] Documentation: bootconfig: Add a doc for extended boot config Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 13/26] tracing: Apply soft-disabled and filter to tracepoints printk Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 14/26] tracing: kprobes: Output kprobe event to printk buffer Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 15/26] tracing: kprobes: Register to dynevent earlier stage Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 16/26] tracing: Accept different type for synthetic event fields Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 17/26] tracing: Add NULL trace-array check in print_synth_event() Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 18/26] tracing/boot: Add boot-time tracing Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 19/26] tracing/boot: Add per-event settings Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 20/26] tracing/boot Add kprobe event support Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 21/26] tracing/boot: Add synthetic " Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 22/26] tracing/boot: Add instance node support Steven Rostedt
2020-01-14 21:03 ` Steven Rostedt [this message]
2020-01-14 21:03 ` [for-next][PATCH 24/26] tracing/boot: Add function tracer filter options Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 25/26] Documentation: tracing: Add boot-time tracing document Steven Rostedt
2020-01-14 21:03 ` [for-next][PATCH 26/26] tracing: trigger: Replace unneeded RCU-list traversals Steven Rostedt
2020-01-14 22:11 ` Steven Rostedt
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