[f2fs-dev] [PATCH] f2fs-tools: apportion atomic write's total delay to its operations

[Daeho Jeong]

From: Daeho Jeong <daehoje...@google.com>

To utilize the delay option of atomic write more useful, need to
apportion it to each operation of it.

Signed-off-by: Daeho Jeong <daehoje...@google.com>
---
 tools/f2fs_io/f2fs_io.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 57a931d..292dcb3 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c
@@ -769,24 +769,30 @@ static void do_write_with_advice(int argc, char **argv,
                }
        }
 
+       total_time = get_current_us();
        if (atomic_commit || atomic_abort) {
                int ret;
 
                if (argc == 8)
-                       useconds = atoi(argv[7]) * 1000;
+                       useconds = atoi(argv[7]) * 1000 / (count + 2);
+
+               if (useconds)
+                       usleep(useconds);
 
                if (replace)
                        ret = ioctl(fd, F2FS_IOC_START_ATOMIC_REPLACE);
                else
                        ret = ioctl(fd, F2FS_IOC_START_ATOMIC_WRITE);
 
+               if (useconds)
+                       usleep(useconds);
+
                if (ret < 0) {
                        fputs("setting atomic file mode failed\n", stderr);
                        exit(1);
                }
        }
 
-       total_time = get_current_us();
        for (i = 0; i < count; i++) {
                uint64_t ret;
 
@@ -804,10 +810,10 @@ static void do_write_with_advice(int argc, char **argv,
                if (ret != buf_size)
                        break;
                written += ret;
-       }
 
-       if (useconds)
-               usleep(useconds);
+               if (useconds)
+                       usleep(useconds);
+       }
 
        if (atomic_commit) {
                int ret;
-- 
2.49.0.472.ge94155a9ec-goog



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