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authorLinus Torvalds2017-02-27 13:26:17 -0800
committerLinus Torvalds2017-02-27 13:26:17 -0800
commit79b17ea740d9fab178d6a1aa15d848b5e6c01b82 (patch)
treeb0c18df8713999e16bcc6e5a32cbef880efb3b10 /include
parente5d56efc97f8240d0b5d66c03949382b6d7e5570 (diff)
parent67d04bb2bcbd3e99f4c4daa58599c90a83ad314a (diff)
Merge tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: "This release has no new tracing features, just clean ups, minor fixes and small optimizations" * tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (25 commits) tracing: Remove outdated ring buffer comment tracing/probes: Fix a warning message to show correct maximum length tracing: Fix return value check in trace_benchmark_reg() tracing: Use modern function declaration jump_label: Reduce the size of struct static_key tracing/probe: Show subsystem name in messages tracing/hwlat: Update old comment about migration timers: Make flags output in the timer_start tracepoint useful tracing: Have traceprobe_probes_write() not access userspace unnecessarily tracing: Have COMM event filter key be treated as a string ftrace: Have set_graph_function handle multiple functions in one write ftrace: Do not hold references of ftrace_graph_{notrace_}hash out of graph_lock tracing: Reset parser->buffer to allow multiple "puts" ftrace: Have set_graph_functions handle write with RDWR ftrace: Reset fgd->hash in ftrace_graph_write() ftrace: Replace (void *)1 with a meaningful macro name FTRACE_GRAPH_EMPTY ftrace: Create a slight optimization on searching the ftrace_hash tracing: Add ftrace_hash_key() helper function ftrace: Convert graph filter to use hash tables ftrace: Expose ftrace_hash_empty and ftrace_lookup_ip ...
Diffstat (limited to 'include')
-rw-r--r--include/linux/compiler.h27
-rw-r--r--include/linux/jump_label.h23
-rw-r--r--include/linux/timer.h2
-rw-r--r--include/trace/events/timer.h14
4 files changed, 46 insertions, 20 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 91c30cba984e..627e697e5d25 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -105,29 +105,36 @@ struct ftrace_branch_data {
};
};
+struct ftrace_likely_data {
+ struct ftrace_branch_data data;
+ unsigned long constant;
+};
+
/*
* Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
* to disable branch tracing on a per file basis.
*/
#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
&& !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
-void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
+void ftrace_likely_update(struct ftrace_likely_data *f, int val,
+ int expect, int is_constant);
#define likely_notrace(x) __builtin_expect(!!(x), 1)
#define unlikely_notrace(x) __builtin_expect(!!(x), 0)
-#define __branch_check__(x, expect) ({ \
+#define __branch_check__(x, expect, is_constant) ({ \
int ______r; \
- static struct ftrace_branch_data \
+ static struct ftrace_likely_data \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_annotated_branch"))) \
______f = { \
- .func = __func__, \
- .file = __FILE__, \
- .line = __LINE__, \
+ .data.func = __func__, \
+ .data.file = __FILE__, \
+ .data.line = __LINE__, \
}; \
- ______r = likely_notrace(x); \
- ftrace_likely_update(&______f, ______r, expect); \
+ ______r = __builtin_expect(!!(x), expect); \
+ ftrace_likely_update(&______f, ______r, \
+ expect, is_constant); \
______r; \
})
@@ -137,10 +144,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
* written by Daniel Walker.
*/
# ifndef likely
-# define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
+# define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
# endif
# ifndef unlikely
-# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
+# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
# endif
#ifdef CONFIG_PROFILE_ALL_BRANCHES
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index b63d6b7b0db0..8e06d758ee48 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -89,11 +89,17 @@ extern bool static_key_initialized;
struct static_key {
atomic_t enabled;
-/* Set lsb bit to 1 if branch is default true, 0 ot */
- struct jump_entry *entries;
-#ifdef CONFIG_MODULES
- struct static_key_mod *next;
-#endif
+/*
+ * bit 0 => 1 if key is initially true
+ * 0 if initially false
+ * bit 1 => 1 if points to struct static_key_mod
+ * 0 if points to struct jump_entry
+ */
+ union {
+ unsigned long type;
+ struct jump_entry *entries;
+ struct static_key_mod *next;
+ };
};
#else
@@ -118,9 +124,10 @@ struct module;
#ifdef HAVE_JUMP_LABEL
-#define JUMP_TYPE_FALSE 0UL
-#define JUMP_TYPE_TRUE 1UL
-#define JUMP_TYPE_MASK 1UL
+#define JUMP_TYPE_FALSE 0UL
+#define JUMP_TYPE_TRUE 1UL
+#define JUMP_TYPE_LINKED 2UL
+#define JUMP_TYPE_MASK 3UL
static __always_inline bool static_key_false(struct static_key *key)
{
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 5a209b84fd9e..c7bdf895179c 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -61,6 +61,8 @@ struct timer_list {
#define TIMER_ARRAYSHIFT 22
#define TIMER_ARRAYMASK 0xFFC00000
+#define TIMER_TRACE_FLAGMASK (TIMER_MIGRATING | TIMER_DEFERRABLE | TIMER_PINNED | TIMER_IRQSAFE)
+
#define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \
.entry = { .next = TIMER_ENTRY_STATIC }, \
.function = (_function), \
diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index 1bca99dbb98f..80787eafba99 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -36,6 +36,13 @@ DEFINE_EVENT(timer_class, timer_init,
TP_ARGS(timer)
);
+#define decode_timer_flags(flags) \
+ __print_flags(flags, "|", \
+ { TIMER_MIGRATING, "M" }, \
+ { TIMER_DEFERRABLE, "D" }, \
+ { TIMER_PINNED, "P" }, \
+ { TIMER_IRQSAFE, "I" })
+
/**
* timer_start - called when the timer is started
* @timer: pointer to struct timer_list
@@ -65,9 +72,12 @@ TRACE_EVENT(timer_start,
__entry->flags = flags;
),
- TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld] flags=0x%08x",
+ TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld] cpu=%u idx=%u flags=%s",
__entry->timer, __entry->function, __entry->expires,
- (long)__entry->expires - __entry->now, __entry->flags)
+ (long)__entry->expires - __entry->now,
+ __entry->flags & TIMER_CPUMASK,
+ __entry->flags >> TIMER_ARRAYSHIFT,
+ decode_timer_flags(__entry->flags & TIMER_TRACE_FLAGMASK))
);
/**