diff mbox series

[-next,v5,3/8] blk-throttle: factor out code to calculate ios/bytes_allowed

Message ID 20220528064330.3471000-4-yukuai3@huawei.com (mailing list archive)
State New, archived
Headers show
Series bugfix and cleanup for blk-throttle | expand

Commit Message

Yu Kuai May 28, 2022, 6:43 a.m. UTC 
No functional changes, new apis will be used in later patches to
calculate wait time for throttled bios while updating config.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 block/blk-throttle.c | 48 +++++++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 18 deletions(-)

Comments

Michal Koutný June 22, 2022, 5:27 p.m. UTC | #1 
On Sat, May 28, 2022 at 02:43:25PM +0800, Yu Kuai <yukuai3@huawei.com> wrote:
> +static u64 calculate_bytes_allowed(u64 bps_limit,
> +				   unsigned long jiffy_elapsed_rnd)

Just noticed with all series applied this argument needn't be called
_rnd. (It's a nit.)
Yu Kuai June 23, 2022, 12:03 p.m. UTC | #2 
Hi，

在 2022/06/23 1:27, Michal Koutný 写道:
> On Sat, May 28, 2022 at 02:43:25PM +0800, Yu Kuai <yukuai3@huawei.com> wrote:
>> +static u64 calculate_bytes_allowed(u64 bps_limit,
>> +				   unsigned long jiffy_elapsed_rnd)
> 
> Just noticed with all series applied this argument needn't be called
> _rnd. (It's a nit.)
> 

Yes, you're right. I'll change that in next version.

Thanks,
Kuai
diff mbox series

Patch

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a89c62bef2fb..d67b20ce4d63 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -754,25 +754,12 @@  static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)
 		   tg->slice_start[rw], tg->slice_end[rw], jiffies);
 }
 
-static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio,
-				  u32 iops_limit, unsigned long *wait)
+static unsigned int calculate_io_allowed(u32 iops_limit,
+					 unsigned long jiffy_elapsed_rnd)
 {
-	bool rw = bio_data_dir(bio);
 	unsigned int io_allowed;
-	unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd;
 	u64 tmp;
 
-	if (iops_limit == UINT_MAX) {
-		if (wait)
-			*wait = 0;
-		return true;
-	}
-
-	jiffy_elapsed = jiffies - tg->slice_start[rw];
-
-	/* Round up to the next throttle slice, wait time must be nonzero */
-	jiffy_elapsed_rnd = roundup(jiffy_elapsed + 1, tg->td->throtl_slice);
-
 	/*
 	 * jiffy_elapsed_rnd should not be a big value as minimum iops can be
 	 * 1 then at max jiffy elapsed should be equivalent of 1 second as we
@@ -788,6 +775,33 @@  static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio,
 	else
 		io_allowed = tmp;
 
+	return io_allowed;
+}
+
+static u64 calculate_bytes_allowed(u64 bps_limit,
+				   unsigned long jiffy_elapsed_rnd)
+{
+	return mul_u64_u64_div_u64(bps_limit, (u64)jiffy_elapsed_rnd, (u64)HZ);
+}
+
+static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio,
+				  u32 iops_limit, unsigned long *wait)
+{
+	bool rw = bio_data_dir(bio);
+	unsigned int io_allowed;
+	unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd;
+
+	if (iops_limit == UINT_MAX) {
+		if (wait)
+			*wait = 0;
+		return true;
+	}
+
+	jiffy_elapsed = jiffies - tg->slice_start[rw];
+
+	/* Round up to the next throttle slice, wait time must be nonzero */
+	jiffy_elapsed_rnd = roundup(jiffy_elapsed + 1, tg->td->throtl_slice);
+	io_allowed = calculate_io_allowed(iops_limit, jiffy_elapsed_rnd);
 	if (tg->io_disp[rw] + 1 <= io_allowed) {
 		if (wait)
 			*wait = 0;
@@ -824,9 +838,7 @@  static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio,
 		jiffy_elapsed_rnd = tg->td->throtl_slice;
 
 	jiffy_elapsed_rnd = roundup(jiffy_elapsed_rnd, tg->td->throtl_slice);
-	bytes_allowed = mul_u64_u64_div_u64(bps_limit, (u64)jiffy_elapsed_rnd,
-					    (u64)HZ);
-
+	bytes_allowed = calculate_bytes_allowed(bps_limit, jiffy_elapsed_rnd);
 	if (tg->bytes_disp[rw] + bio_size <= bytes_allowed) {
 		if (wait)
 			*wait = 0;