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authorShaohua Li <shli@fb.com>2017-07-12 11:49:56 -0700
committerJens Axboe <axboe@kernel.dk>2017-07-29 09:00:03 -0600
commit35fe6d763229e8fc0eb5f9b93a401673cfcb5e1e (patch)
treeea38b526a62121671ef7bfff76f7d23e29804b42
parent69fd5c391763bd94a40dd152bc72a7f230137150 (diff)
downloadlinux-35fe6d763229e8fc0eb5f9b93a401673cfcb5e1e.tar.bz2
block: use standard blktrace API to output cgroup info for debug notes
Currently cfq/bfq/blk-throttle output cgroup info in trace in their own way. Now we have standard blktrace API for this, so convert them to use it. Note, this changes the behavior a little bit. cgroup info isn't output by default, we only do this with 'blk_cgroup' option enabled. cgroup info isn't output as a string by default too, we only do this with 'blk_cgname' option enabled. Also cgroup info is output in different position of the note string. I think these behavior changes aren't a big issue (actually we make trace data shorter which is good), since the blktrace note is solely for debugging. Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/bfq-iosched.h13
-rw-r--r--block/blk-throttle.c6
-rw-r--r--block/cfq-iosched.c15
-rw-r--r--include/linux/blktrace_api.h13
-rw-r--r--kernel/trace/blktrace.c12
5 files changed, 35 insertions, 24 deletions
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 63e771ab56d8..1f74d71b45cd 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -917,13 +917,16 @@ void bfq_add_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq);
struct bfq_group *bfqq_group(struct bfq_queue *bfqq);
#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) do { \
- blk_add_trace_msg((bfqd)->queue, "bfq%d%c %s " fmt, (bfqq)->pid,\
- bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \
- bfqq_group(bfqq)->blkg_path, ##args); \
+ blk_add_cgroup_trace_msg((bfqd)->queue, \
+ bfqg_to_blkg(bfqq_group(bfqq))->blkcg, \
+ "bfq%d%c " fmt, (bfqq)->pid, \
+ bfq_bfqq_sync((bfqq)) ? 'S' : 'A', ##args); \
} while (0)
-#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) \
- blk_add_trace_msg((bfqd)->queue, "%s " fmt, (bfqg)->blkg_path, ##args)
+#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do { \
+ blk_add_cgroup_trace_msg((bfqd)->queue, \
+ bfqg_to_blkg(bfqg)->blkcg, fmt, ##args); \
+} while (0)
#else /* CONFIG_BFQ_GROUP_IOSCHED */
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a6ebd2bdb4df..6a4c4c493dd5 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -373,10 +373,8 @@ static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)
if (likely(!blk_trace_note_message_enabled(__td->queue))) \
break; \
if ((__tg)) { \
- char __pbuf[128]; \
- \
- blkg_path(tg_to_blkg(__tg), __pbuf, sizeof(__pbuf)); \
- blk_add_trace_msg(__td->queue, "throtl %s " fmt, __pbuf, ##args); \
+ blk_add_cgroup_trace_msg(__td->queue, \
+ tg_to_blkg(__tg)->blkcg, "throtl " fmt, ##args);\
} else { \
blk_add_trace_msg(__td->queue, "throtl " fmt, ##args); \
} \
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 3d5c28945719..0fb78fb3c03c 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -656,20 +656,17 @@ static inline void cfqg_put(struct cfq_group *cfqg)
}
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) do { \
- char __pbuf[128]; \
- \
- blkg_path(cfqg_to_blkg((cfqq)->cfqg), __pbuf, sizeof(__pbuf)); \
- blk_add_trace_msg((cfqd)->queue, "cfq%d%c%c %s " fmt, (cfqq)->pid, \
+ blk_add_cgroup_trace_msg((cfqd)->queue, \
+ cfqg_to_blkg((cfqq)->cfqg)->blkcg, \
+ "cfq%d%c%c " fmt, (cfqq)->pid, \
cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
cfqq_type((cfqq)) == SYNC_NOIDLE_WORKLOAD ? 'N' : ' ',\
- __pbuf, ##args); \
+ ##args); \
} while (0)
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do { \
- char __pbuf[128]; \
- \
- blkg_path(cfqg_to_blkg(cfqg), __pbuf, sizeof(__pbuf)); \
- blk_add_trace_msg((cfqd)->queue, "%s " fmt, __pbuf, ##args); \
+ blk_add_cgroup_trace_msg((cfqd)->queue, \
+ cfqg_to_blkg(cfqg)->blkcg, fmt, ##args); \
} while (0)
static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index d2e908586e3d..67b4d4dfc19c 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -28,10 +28,12 @@ struct blk_trace {
atomic_t dropped;
};
+struct blkcg;
+
extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
-extern __printf(2, 3)
-void __trace_note_message(struct blk_trace *, const char *fmt, ...);
+extern __printf(3, 4)
+void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *fmt, ...);
/**
* blk_add_trace_msg - Add a (simple) message to the blktrace stream
@@ -46,12 +48,14 @@ void __trace_note_message(struct blk_trace *, const char *fmt, ...);
* NOTE: Can not use 'static inline' due to presence of var args...
*
**/
-#define blk_add_trace_msg(q, fmt, ...) \
+#define blk_add_cgroup_trace_msg(q, cg, fmt, ...) \
do { \
struct blk_trace *bt = (q)->blk_trace; \
if (unlikely(bt)) \
- __trace_note_message(bt, fmt, ##__VA_ARGS__); \
+ __trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\
} while (0)
+#define blk_add_trace_msg(q, fmt, ...) \
+ blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__)
#define BLK_TN_MAX_MSG 128
static inline bool blk_trace_note_message_enabled(struct request_queue *q)
@@ -82,6 +86,7 @@ extern struct attribute_group blk_trace_attr_group;
# define blk_trace_startstop(q, start) (-ENOTTY)
# define blk_trace_remove(q) (-ENOTTY)
# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
+# define blk_add_cgroup_trace_msg(q, cg, fmt, ...) do { } while (0)
# define blk_trace_remove_sysfs(dev) do { } while (0)
# define blk_trace_note_message_enabled(q) (false)
static inline int blk_trace_init_sysfs(struct device *dev)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index e90974ed4532..7724de18d2fe 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -154,7 +154,8 @@ static void trace_note_time(struct blk_trace *bt)
local_irq_restore(flags);
}
-void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
+void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg,
+ const char *fmt, ...)
{
int n;
va_list args;
@@ -178,7 +179,14 @@ void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
va_end(args);
+ if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP))
+ blkcg = NULL;
+#ifdef CONFIG_BLK_CGROUP
+ trace_note(bt, 0, BLK_TN_MESSAGE, buf, n,
+ blkcg ? cgroup_get_kernfs_id(blkcg->css.cgroup) : NULL);
+#else
trace_note(bt, 0, BLK_TN_MESSAGE, buf, n, NULL);
+#endif
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(__trace_note_message);
@@ -375,7 +383,7 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
return PTR_ERR(msg);
bt = filp->private_data;
- __trace_note_message(bt, "%s", msg);
+ __trace_note_message(bt, NULL, "%s", msg);
kfree(msg);
return count;