block/throttle-groups: Use ThrottleDirection instread of bool is_write

'bool is_write' style is obsolete from throttle framework, adapt
block throttle groups to the new style:
- use ThrottleDirection instead of 'bool is_write'. Ex,
  schedule_next_request(ThrottleGroupMember *tgm, bool is_write)
  -> schedule_next_request(ThrottleGroupMember *tgm, ThrottleDirection direction)

- use THROTTLE_MAX instead of hard code. Ex, ThrottleGroupMember *tokens[2]
  -> ThrottleGroupMember *tokens[THROTTLE_MAX]

- use ThrottleDirection instead of hard code on iteration. Ex, (i = 0; i < 2; i++)
  -> for (dir = THROTTLE_READ; dir < THROTTLE_MAX; dir++)

Use a simple python script to test the new style:
 #!/usr/bin/python3
import subprocess
import random
import time

commands = ['virsh blkdeviotune jammy vda --write-bytes-sec ', \
            'virsh blkdeviotune jammy vda --write-iops-sec ', \
            'virsh blkdeviotune jammy vda --read-bytes-sec ', \
            'virsh blkdeviotune jammy vda --read-iops-sec ']

for loop in range(1, 1000):
    time.sleep(random.randrange(3, 5))
    command = commands[random.randrange(0, 3)] + str(random.randrange(0, 1000000))
    subprocess.run(command, shell=True, check=True)

This works fine.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230728022006.1098509-10-pizhenwei@bytedance.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/block/throttle.c b/block/throttle.c
index 3aaef18d4e..1098a4ae9a 100644
--- a/block/throttle.c
+++ b/block/throttle.c
@@ -118,7 +118,7 @@ throttle_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
 {
 
     ThrottleGroupMember *tgm = bs->opaque;
-    throttle_group_co_io_limits_intercept(tgm, bytes, false);
+    throttle_group_co_io_limits_intercept(tgm, bytes, THROTTLE_READ);
 
     return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
 }
@@ -128,7 +128,7 @@ throttle_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
                     QEMUIOVector *qiov, BdrvRequestFlags flags)
 {
     ThrottleGroupMember *tgm = bs->opaque;
-    throttle_group_co_io_limits_intercept(tgm, bytes, true);
+    throttle_group_co_io_limits_intercept(tgm, bytes, THROTTLE_WRITE);
 
     return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
 }
@@ -138,7 +138,7 @@ throttle_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
                           BdrvRequestFlags flags)
 {
     ThrottleGroupMember *tgm = bs->opaque;
-    throttle_group_co_io_limits_intercept(tgm, bytes, true);
+    throttle_group_co_io_limits_intercept(tgm, bytes, THROTTLE_WRITE);
 
     return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
 }
@@ -147,7 +147,7 @@ static int coroutine_fn GRAPH_RDLOCK
 throttle_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
 {
     ThrottleGroupMember *tgm = bs->opaque;
-    throttle_group_co_io_limits_intercept(tgm, bytes, true);
+    throttle_group_co_io_limits_intercept(tgm, bytes, THROTTLE_WRITE);
 
     return bdrv_co_pdiscard(bs->file, offset, bytes);
 }