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-rw-r--r--block/blktrace.c15
-rw-r--r--include/linux/blktrace_api.h3
2 files changed, 14 insertions, 4 deletions
diff --git a/block/blktrace.c b/block/blktrace.c
index 20e11f3..7ae87cc 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -79,13 +79,16 @@ void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
{
int n;
va_list args;
- static char bt_msg_buf[BLK_TN_MAX_MSG];
+ char *buf;
+ preempt_disable();
+ buf = per_cpu_ptr(bt->msg_data, smp_processor_id());
va_start(args, fmt);
- n = vscnprintf(bt_msg_buf, BLK_TN_MAX_MSG, fmt, args);
+ n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
va_end(args);
- trace_note(bt, 0, BLK_TN_MESSAGE, bt_msg_buf, n);
+ trace_note(bt, 0, BLK_TN_MESSAGE, buf, n);
+ preempt_enable();
}
EXPORT_SYMBOL_GPL(__trace_note_message);
@@ -246,6 +249,7 @@ static void blk_trace_cleanup(struct blk_trace *bt)
debugfs_remove(bt->dropped_file);
blk_remove_tree(bt->dir);
free_percpu(bt->sequence);
+ free_percpu(bt->msg_data);
kfree(bt);
}
@@ -360,6 +364,10 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
if (!bt->sequence)
goto err;
+ bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG);
+ if (!bt->msg_data)
+ goto err;
+
ret = -ENOENT;
dir = blk_create_tree(buts->name);
if (!dir)
@@ -406,6 +414,7 @@ err:
if (bt->dropped_file)
debugfs_remove(bt->dropped_file);
free_percpu(bt->sequence);
+ free_percpu(bt->msg_data);
if (bt->rchan)
relay_close(bt->rchan);
kfree(bt);
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index b7cd8f1..e3ef903 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -121,6 +121,7 @@ struct blk_trace {
int trace_state;
struct rchan *rchan;
unsigned long *sequence;
+ unsigned char *msg_data;
u16 act_mask;
u64 start_lba;
u64 end_lba;
@@ -172,7 +173,7 @@ extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);
if (unlikely(bt)) \
__trace_note_message(bt, fmt, ##__VA_ARGS__); \
} while (0)
-#define BLK_TN_MAX_MSG 1024
+#define BLK_TN_MAX_MSG 128
/**
* blk_add_trace_rq - Add a trace for a request oriented action
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