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ftrace: Do not copy old hash when resetting

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Do not waste time copying the old hash if the hash is going to be
reset. Just allocate a new hash and free the old one, as that is
the same result as copying te old one and then resetting it.

Link: http://lkml.kernel.org/p/1405384820-48837-1-git-send-email-wangnan0@huawei.com

Signed-off-by: Wang Nan <wangnan0@huawei.com>
[ SDR: Removed unused ftrace_filter_reset() function ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Wang Nan 2014-07-15 08:40:20 +08:00 committed by Steven Rostedt
parent 6508fa761c
commit b972cc58ce
1 changed files with 5 additions and 10 deletions
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15
kernel/trace/ftrace.c
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@ -2949,13 +2949,6 @@ ftrace_enabled_open(struct inode *inode, struct file *file)
return iter ? 0 : -ENOMEM;
}
static void ftrace_filter_reset(struct ftrace_hash *hash)
{
mutex_lock(&ftrace_lock);
ftrace_hash_clear(hash);
mutex_unlock(&ftrace_lock);
}
/**
* ftrace_regex_open - initialize function tracer filter files
* @ops: The ftrace_ops that hold the hash filters
@ -3720,14 +3713,16 @@ 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_ftrace_hash(FTRACE_HASH_DEFAULT_BITS);
else
hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
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;