diff options
| author | Namhyung Kim <namhyung.kim@lge.com> | 2013-04-10 01:55:50 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-04-13 05:02:33 +0200 |
| commit | 20079ebe73c16b34621abd2993f3d48e2f9336b7 (patch) | |
| tree | 96b2ace696902e848edd01173505fddba44a743e /kernel | |
| parent | tracing: Check return value of tracing_init_dentry() (diff) | |
| download | linux-20079ebe73c16b34621abd2993f3d48e2f9336b7.tar.xz linux-20079ebe73c16b34621abd2993f3d48e2f9336b7.zip | |
ftrace: Get rid of ftrace_profile_bits
It seems that function profiler's hash size is fixed at 1024. Add and
use FTRACE_PROFILE_HASH_BITS instead and update hash size macro.
Link: http://lkml.kernel.org/r/1365551750-4504-1-git-send-email-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 3b84fc100788..9b44abb2c5a0 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -486,7 +486,6 @@ struct ftrace_profile_stat { #define PROFILES_PER_PAGE \ (PROFILE_RECORDS_SIZE / sizeof(struct ftrace_profile)) -static int ftrace_profile_bits __read_mostly; static int ftrace_profile_enabled __read_mostly; /* ftrace_profile_lock - synchronize the enable and disable of the profiler */ @@ -494,7 +493,8 @@ static DEFINE_MUTEX(ftrace_profile_lock); static DEFINE_PER_CPU(struct ftrace_profile_stat, ftrace_profile_stats); -#define FTRACE_PROFILE_HASH_SIZE 1024 /* must be power of 2 */ +#define FTRACE_PROFILE_HASH_BITS 10 +#define FTRACE_PROFILE_HASH_SIZE (1 << FTRACE_PROFILE_HASH_BITS) static void * function_stat_next(void *v, int idx) @@ -725,13 +725,6 @@ static int ftrace_profile_init_cpu(int cpu) if (!stat->hash) return -ENOMEM; - if (!ftrace_profile_bits) { - size--; - - for (; size; size >>= 1) - ftrace_profile_bits++; - } - /* Preallocate the function profiling pages */ if (ftrace_profile_pages_init(stat) < 0) { kfree(stat->hash); @@ -765,7 +758,7 @@ ftrace_find_profiled_func(struct ftrace_profile_stat *stat, unsigned long ip) struct hlist_node *n; unsigned long key; - key = hash_long(ip, ftrace_profile_bits); + key = hash_long(ip, FTRACE_PROFILE_HASH_BITS); hhd = &stat->hash[key]; if (hlist_empty(hhd)) @@ -784,7 +777,7 @@ static void ftrace_add_profile(struct ftrace_profile_stat *stat, { unsigned long key; - key = hash_long(rec->ip, ftrace_profile_bits); + key = hash_long(rec->ip, FTRACE_PROFILE_HASH_BITS); hlist_add_head_rcu(&rec->node, &stat->hash[key]); } |