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Date: Wed, 22 Jul 2009 11:25:14 +0800 From: Xiao Guangrong <xiaoguangrong@...fujitsu.com> To: Ingo Molnar <mingo@...e.hu> CC: "K.Prasad" <prasad@...ux.vnet.ibm.com>, Alan Stern <stern@...land.harvard.edu>, Frederic Weisbecker <fweisbec@...il.com>, Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org> Subject: [PATCH 3/3] tracing/ksym_tracer: support quick clear for ksym_trace_filter It's rather bored to clear symbol one by one in ksym_trace_filter file, so, this patch can let ksym_trace_filter file support quick clear, we can write "0" to this file, it can clear all symbols for example: # cat ksym_trace_filter ksym_filter_head:rw- global_trace:rw- # echo 0 > ksym_trace_filter # cat ksym_trace_filter # Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com> --- kernel/trace/trace_ksym.c | 45 +++++++++++++++++++++++++++------------------ 1 files changed, 27 insertions(+), 18 deletions(-) diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c index cd5cb65..96b9e19 100644 --- a/kernel/trace/trace_ksym.c +++ b/kernel/trace/trace_ksym.c @@ -163,8 +163,6 @@ static int parse_ksym_trace_str(char *input_string, char **ksymname, { int ret; - strstrip(input_string); - *ksymname = strsep(&input_string, ":"); *addr = kallsyms_lookup_name(*ksymname); @@ -262,6 +260,25 @@ static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf, return cnt; } +static void __ksym_trace_reset(void) +{ + struct trace_ksym *entry; + struct hlist_node *node, *node1; + + mutex_lock(&ksym_tracer_mutex); + hlist_for_each_entry_safe(entry, node, node1, &ksym_filter_head, + ksym_hlist) { + unregister_kernel_hw_breakpoint(entry->ksym_hbp); + ksym_filter_entry_count--; + hlist_del_rcu(&(entry->ksym_hlist)); + synchronize_rcu(); + kfree(entry->ksym_hbp->info.name); + kfree(entry->ksym_hbp); + kfree(entry); + } + mutex_unlock(&ksym_tracer_mutex); +} + static ssize_t ksym_trace_filter_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) @@ -282,6 +299,13 @@ static ssize_t ksym_trace_filter_write(struct file *file, } input_string[count] = '\0'; + strstrip(input_string); + if (!strcmp(input_string, "0")) { + __ksym_trace_reset(); + kfree(input_string); + return count; + } + ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr); if (ret < 0) { kfree(input_string); @@ -341,23 +365,8 @@ static const struct file_operations ksym_tracing_fops = { static void ksym_trace_reset(struct trace_array *tr) { - struct trace_ksym *entry; - struct hlist_node *node, *node1; - ksym_tracing_enabled = 0; - - mutex_lock(&ksym_tracer_mutex); - hlist_for_each_entry_safe(entry, node, node1, &ksym_filter_head, - ksym_hlist) { - unregister_kernel_hw_breakpoint(entry->ksym_hbp); - ksym_filter_entry_count--; - hlist_del_rcu(&(entry->ksym_hlist)); - synchronize_rcu(); - kfree(entry->ksym_hbp->info.name); - kfree(entry->ksym_hbp); - kfree(entry); - } - mutex_unlock(&ksym_tracer_mutex); + __ksym_trace_reset(); } static int ksym_trace_init(struct trace_array *tr) -- 1.6.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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