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blktrace: cleanup the __trace_note_message interface

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Pass the cgroup_subsys_state instead of a the blkg so that blktrace
doesn't need to poke into blk-cgroup internals, and give the name a
blk prefix as the current name is way too generic for a public
interface.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-04-20 06:27:16 +02:00 • committed by Jens Axboe
parent dec223c92a
commit f4a6a61cb6
4 changed files with 17 additions and 19 deletions
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4
block/bfq-iosched.h
View file

@ -1102,13 +1102,13 @@ struct bfq_group *bfqq_group(struct bfq_queue *bfqq);
break; \
bfq_bfqq_name((bfqq), pid_str, MAX_BFQQ_NAME_LENGTH); \
blk_add_cgroup_trace_msg((bfqd)->queue, \
bfqg_to_blkg(bfqq_group(bfqq))->blkcg, \
&bfqg_to_blkg(bfqq_group(bfqq))->blkcg->css, \
"%s " fmt, pid_str, ##args); \
} while (0)
#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do { \
blk_add_cgroup_trace_msg((bfqd)->queue, \
bfqg_to_blkg(bfqg)->blkcg, fmt, ##args); \
&bfqg_to_blkg(bfqg)->blkcg->css, fmt, ##args); \
} while (0)
#else /* CONFIG_BFQ_GROUP_IOSCHED */

2
block/blk-throttle.c
View file

@ -227,7 +227,7 @@ static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)
break; \
if ((__tg)) { \
blk_add_cgroup_trace_msg(__td->queue, \
tg_to_blkg(__tg)->blkcg, "throtl " fmt, ##args);\
&tg_to_blkg(__tg)->blkcg->css, "throtl " fmt, ##args);\
} else { \
blk_add_trace_msg(__td->queue, "throtl " fmt, ##args); \
} \

10
include/linux/blktrace_api.h
View file

@ -27,12 +27,10 @@ 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(3, 4)
void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *fmt, ...);
__printf(3, 4) void __blk_trace_note_message(struct blk_trace *bt,
struct cgroup_subsys_state *css, const char *fmt, ...);
/**
* blk_add_trace_msg - Add a (simple) message to the blktrace stream
@ -47,14 +45,14 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f
* NOTE: Can not use 'static inline' due to presence of var args...
*
**/
#define blk_add_cgroup_trace_msg(q, cg, fmt, ...) \
#define blk_add_cgroup_trace_msg(q, css, fmt, ...) \
do { \
struct blk_trace *bt; \
\
rcu_read_lock(); \
bt = rcu_dereference((q)->blk_trace); \
if (unlikely(bt)) \
__trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\
__blk_trace_note_message(bt, css, fmt, ##__VA_ARGS__);\
rcu_read_unlock(); \
} while (0)
#define blk_add_trace_msg(q, fmt, ...) \

20
kernel/trace/blktrace.c
View file

@ -145,13 +145,14 @@ static void trace_note_time(struct blk_trace *bt)
local_irq_restore(flags);
}
void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg,
const char *fmt, ...)
void __blk_trace_note_message(struct blk_trace *bt,
struct cgroup_subsys_state *css, const char *fmt, ...)
{
int n;
va_list args;
unsigned long flags;
char *buf;
u64 cgid = 0;
if (unlikely(bt->trace_state != Blktrace_running &&
!blk_tracer_enabled))
@ -170,17 +171,16 @@ void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg,
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, current->pid, BLK_TN_MESSAGE, buf, n,
blkcg ? cgroup_id(blkcg->css.cgroup) : 1);
#else
trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, 0);
if (css && (blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP))
cgid = cgroup_id(css->cgroup);
else
cgid = 1;
#endif
trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, cgid);
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(__trace_note_message);
EXPORT_SYMBOL_GPL(__blk_trace_note_message);
static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
pid_t pid)
@ -411,7 +411,7 @@ 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, NULL, "%s", msg);
__blk_trace_note_message(bt, NULL, "%s", msg);
kfree(msg);
return count;