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| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-08-18 15:57:52 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-09-01 09:58:06 +0200 |
| commit | d25e37d89dd2f41d7acae0429039d2f0ae8b4a07 (patch) | |
| tree | 16e6d52b374b3907e51dd3a96b30f3c427f9a55f /include/linux/tracepoint-defs.h | |
| parent | static_call: Allow early init (diff) | |
| download | linux-dev-d25e37d89dd2f41d7acae0429039d2f0ae8b4a07.tar.xz linux-dev-d25e37d89dd2f41d7acae0429039d2f0ae8b4a07.zip | |
tracepoint: Optimize using static_call()
Currently the tracepoint site will iterate a vector and issue indirect
calls to however many handlers are registered (ie. the vector is
long).
Using static_call() it is possible to optimize this for the common
case of only having a single handler registered. In this case the
static_call() can directly call this handler. Otherwise, if the vector
is longer than 1, call a function that iterates the whole vector like
the current code.
[peterz: updated to new interface]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20200818135805.279421092@infradead.org
Diffstat (limited to 'include/linux/tracepoint-defs.h')
| -rw-r--r-- | include/linux/tracepoint-defs.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/tracepoint-defs.h b/include/linux/tracepoint-defs.h index b29950a19205..de97450cf190 100644 --- a/include/linux/tracepoint-defs.h +++ b/include/linux/tracepoint-defs.h @@ -11,6 +11,8 @@ #include <linux/atomic.h> #include <linux/static_key.h> +struct static_call_key; + struct trace_print_flags { unsigned long mask; const char *name; @@ -30,6 +32,9 @@ struct tracepoint_func { struct tracepoint { const char *name; /* Tracepoint name */ struct static_key key; + struct static_call_key *static_call_key; + void *static_call_tramp; + void *iterator; int (*regfunc)(void); void (*unregfunc)(void); struct tracepoint_func __rcu *funcs; |