Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [PATCH] ftrace: Do not copy old hash when resetting. | Date | Mon, 14 Jul 2014 12:10:00 +0800 |
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If we are going to reset hash, we don't need to duplicate old hash and remove every entries right after allocation.
Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@redhat.com> --- kernel/trace/ftrace.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 5b372e3..52d6931 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -3471,14 +3471,16 @@ ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len, else orig_hash = &ops->notrace_hash; - hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); + if (!reset) + hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); + else + hash = alloc_ftrace_hash(FTRACE_HASH_DEFAULT_BITS); + if (!hash) { ret = -ENOMEM; goto out_regex_unlock; } - if (reset) - ftrace_filter_reset(hash); if (buf && !ftrace_match_records(hash, buf, len)) { ret = -EINVAL; goto out_regex_unlock; -- 1.8.4
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