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authorColy Li <colyli@suse.de>2018-08-09 10:48:43 +0300
committerJens Axboe <axboe@kernel.dk>2018-08-09 17:21:03 +0300
commitb4cb6efc1af7da2fa1e9ff0eaf90e2be02cfdf5f (patch)
treedc2ff414c77f92ce984d3412746246b069a80828 /drivers
parent78ac2107176baa0daf65b0fb8e561d2ed14c83ca (diff)
downloadlinux-b4cb6efc1af7da2fa1e9ff0eaf90e2be02cfdf5f.tar.xz
bcache: display rate debug parameters to 0 when writeback is not running
When writeback is not running, writeback rate should be 0, other value is misleading. And the following dyanmic writeback rate debug parameters should be 0 too, rate, proportional, integral, change otherwise they are misleading when writeback is not running. Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/bcache/sysfs.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 225b15aa0340..3e9d3459a224 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -149,6 +149,7 @@ SHOW(__bch_cached_dev)
struct cached_dev *dc = container_of(kobj, struct cached_dev,
disk.kobj);
const char *states[] = { "no cache", "clean", "dirty", "inconsistent" };
+ int wb = dc->writeback_running;
#define var(stat) (dc->stat)
@@ -170,7 +171,7 @@ SHOW(__bch_cached_dev)
var_printf(writeback_running, "%i");
var_print(writeback_delay);
var_print(writeback_percent);
- sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9);
+ sysfs_hprint(writeback_rate, wb ? dc->writeback_rate.rate << 9 : 0);
sysfs_hprint(io_errors, atomic_read(&dc->io_errors));
sysfs_printf(io_error_limit, "%i", dc->error_limit);
sysfs_printf(io_disable, "%i", dc->io_disable);
@@ -188,15 +189,20 @@ SHOW(__bch_cached_dev)
char change[20];
s64 next_io;
- bch_hprint(rate, dc->writeback_rate.rate << 9);
- bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
- bch_hprint(target, dc->writeback_rate_target << 9);
- bch_hprint(proportional,dc->writeback_rate_proportional << 9);
- bch_hprint(integral, dc->writeback_rate_integral_scaled << 9);
- bch_hprint(change, dc->writeback_rate_change << 9);
-
- next_io = div64_s64(dc->writeback_rate.next - local_clock(),
- NSEC_PER_MSEC);
+ /*
+ * Except for dirty and target, other values should
+ * be 0 if writeback is not running.
+ */
+ bch_hprint(rate, wb ? dc->writeback_rate.rate << 9 : 0);
+ bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
+ bch_hprint(target, dc->writeback_rate_target << 9);
+ bch_hprint(proportional,
+ wb ? dc->writeback_rate_proportional << 9 : 0);
+ bch_hprint(integral,
+ wb ? dc->writeback_rate_integral_scaled << 9 : 0);
+ bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0);
+ next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(),
+ NSEC_PER_MSEC) : 0;
return sprintf(buf,
"rate:\t\t%s/sec\n"