Because the length of task'name in task_struct can not exceed
16 characters, f2fs some thread'name cannot be fully displayed,
including important device number information.
If there are more than one partition using the f2fs file system,
it is very inconvenient to match partitions and their threads.
The following examples show that 4 partitions all use f2fs file system
PID: 400 TASK: ffffff80f120c9c0 CPU: 2 COMMAND: "f2fs_discard-25"
PID: 392 TASK: ffffff80f6b75880 CPU: 3 COMMAND: "f2fs_discard-25"
PID: 400 TASK: ffffff80f120c9c0 CPU: 2 COMMAND: "f2fs_discard-25"
PID: 392 TASK: ffffff80f6b75880 CPU: 3 COMMAND: "f2fs_discard-25"
PID: 510 TASK: ffffff80dd62c9c0 CPU: 0 COMMAND: "f2fs_ckpt-254:4"
PID: 255 TASK: ffffff80f2268000 CPU: 3 COMMAND: "f2fs_ckpt-259:4"
PID: 398 TASK: ffffff80f120ac40 CPU: 2 COMMAND: "f2fs_ckpt-259:4"
PID: 390 TASK: ffffff80f6b76740 CPU: 3 COMMAND: "f2fs_ckpt-259:4"
PID: 511 TASK: ffffff80dd629d80 CPU: 3 COMMAND: "f2fs_flush-254:"
PID: 399 TASK: ffffff80f120bb00 CPU: 2 COMMAND: "f2fs_flush-259:"
PID: 391 TASK: ffffff80f6b70000 CPU: 3 COMMAND: "f2fs_flush-259:"
PID: 256 TASK: ffffff80f226d880 CPU: 6 COMMAND: "f2fs_flush-259:"
We can use the name format such as f2fs_gc-xxx, as saw in device:
PID: 260 TASK: ffffff80f8c2e740 CPU: 3 COMMAND: "f2fs_gc-259:44"
PID: 420 TASK: ffffff80f6505880 CPU: 2 COMMAND: "f2fs_gc-259:41"
PID: 393 TASK: ffffff80f6b72c40 CPU: 1 COMMAND: "f2fs_gc-259:40
PID: 513 TASK: ffffff80dd62e740 CPU: 1 COMMAND: "f2fs_gc-254:40"
Signed-off-by: Zhiguo Niu <[email protected]>
---
fs/f2fs/checkpoint.c | 2 +-
fs/f2fs/segment.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index b0597a5..f6a5424 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1893,7 +1893,7 @@ int f2fs_start_ckpt_thread(struct f2fs_sb_info *sbi)
return 0;
cprc->f2fs_issue_ckpt = kthread_run(issue_checkpoint_thread, sbi,
- "f2fs_ckpt-%u:%u", MAJOR(dev), MINOR(dev));
+ "f2fs_cp-%u:%u", MAJOR(dev), MINOR(dev));
if (IS_ERR(cprc->f2fs_issue_ckpt)) {
int err = PTR_ERR(cprc->f2fs_issue_ckpt);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index d05b416..b290713 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -677,7 +677,7 @@ int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
init_thread:
fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
- "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
+ "f2fs_fh-%u:%u", MAJOR(dev), MINOR(dev));
if (IS_ERR(fcc->f2fs_issue_flush)) {
int err = PTR_ERR(fcc->f2fs_issue_flush);
@@ -2248,7 +2248,7 @@ int f2fs_start_discard_thread(struct f2fs_sb_info *sbi)
return 0;
dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
- "f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
+ "f2fs_dc-%u:%u", MAJOR(dev), MINOR(dev));
if (IS_ERR(dcc->f2fs_issue_discard)) {
err = PTR_ERR(dcc->f2fs_issue_discard);
dcc->f2fs_issue_discard = NULL;
--
1.9.1