diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index d8147b336c35..6518a55273e7 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt | |||
| @@ -38,6 +38,13 @@ read or write requests. Note that the total allocated number may be twice | |||
| 38 | this amount, since it applies only to reads or writes (not the accumulated | 38 | this amount, since it applies only to reads or writes (not the accumulated |
| 39 | sum). | 39 | sum). |
| 40 | 40 | ||
| 41 | To avoid priority inversion through request starvation, a request | ||
| 42 | queue maintains a separate request pool per each cgroup when | ||
| 43 | CONFIG_BLK_CGROUP is enabled, and this parameter applies to each such | ||
| 44 | per-block-cgroup request pool. IOW, if there are N block cgroups, | ||
| 45 | each request queue may have upto N request pools, each independently | ||
| 46 | regulated by nr_requests. | ||
| 47 | |||
| 41 | read_ahead_kb (RW) | 48 | read_ahead_kb (RW) |
| 42 | ------------------ | 49 | ------------------ |
| 43 | Maximum number of kilobytes to read-ahead for filesystems on this block | 50 | Maximum number of kilobytes to read-ahead for filesystems on this block |