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authorTejun Heo <tj@kernel.org>2010-07-20 22:09:01 +0200
committerTejun Heo <tj@kernel.org>2010-07-22 22:58:34 +0200
commit8b8edefa2fffbff97f9eec8b70e78ae23abad1a0 (patch)
tree7f0efac8adb9c9ed7be8af63e51510954f1c51dc /Documentation
parente120153ddf8620fd0a194d301e9c5a8b28483bb5 (diff)
downloadop-kernel-dev-8b8edefa2fffbff97f9eec8b70e78ae23abad1a0.zip
op-kernel-dev-8b8edefa2fffbff97f9eec8b70e78ae23abad1a0.tar.gz
fscache: convert object to use workqueue instead of slow-work
Make fscache object state transition callbacks use workqueue instead of slow-work. New dedicated unbound CPU workqueue fscache_object_wq is created. get/put callbacks are renamed and modified to take @object and called directly from the enqueue wrapper and the work function. While at it, make all open coded instances of get/put to use fscache_get/put_object(). * Unbound workqueue is used. * work_busy() output is printed instead of slow-work flags in object debugging outputs. They mean basically the same thing bit-for-bit. * sysctl fscache.object_max_active added to control concurrency. The default value is nr_cpus clamped between 4 and WQ_UNBOUND_MAX_ACTIVE. * slow_work_sleep_till_thread_needed() is replaced with fscache private implementation fscache_object_sleep_till_congested() which waits on fscache_object_wq congestion. * debugfs support is dropped for now. Tracing API based debug facility is planned to be added. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/caching/fscache.txt10
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/filesystems/caching/fscache.txt b/Documentation/filesystems/caching/fscache.txt
index a91e2e2..770267a 100644
--- a/Documentation/filesystems/caching/fscache.txt
+++ b/Documentation/filesystems/caching/fscache.txt
@@ -343,8 +343,8 @@ This will look something like:
[root@andromeda ~]# head /proc/fs/fscache/objects
OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS EM EV F S | NETFS_COOKIE_DEF TY FL NETFS_DATA OBJECT_KEY, AUX_DATA
======== ======== ==== ===== === === === == ===== == == = = | ================ == == ================ ================
- 17e4b 2 ACTV 0 0 0 0 0 0 7b 4 0 8 | NFS.fh DT 0 ffff88001dd82820 010006017edcf8bbc93b43298fdfbe71e50b57b13a172c0117f38472, e567634700000000000000000000000063f2404a000000000000000000000000c9030000000000000000000063f2404a
- 1693a 2 ACTV 0 0 0 0 0 0 7b 4 0 8 | NFS.fh DT 0 ffff88002db23380 010006017edcf8bbc93b43298fdfbe71e50b57b1e0162c01a2df0ea6, 420ebc4a000000000000000000000000420ebc4a0000000000000000000000000e1801000000000000000000420ebc4a
+ 17e4b 2 ACTV 0 0 0 0 0 0 7b 4 0 0 | NFS.fh DT 0 ffff88001dd82820 010006017edcf8bbc93b43298fdfbe71e50b57b13a172c0117f38472, e567634700000000000000000000000063f2404a000000000000000000000000c9030000000000000000000063f2404a
+ 1693a 2 ACTV 0 0 0 0 0 0 7b 4 0 0 | NFS.fh DT 0 ffff88002db23380 010006017edcf8bbc93b43298fdfbe71e50b57b1e0162c01a2df0ea6, 420ebc4a000000000000000000000000420ebc4a0000000000000000000000000e1801000000000000000000420ebc4a
where the first set of columns before the '|' describe the object:
@@ -362,7 +362,7 @@ where the first set of columns before the '|' describe the object:
EM Object's event mask
EV Events raised on this object
F Object flags
- S Object slow-work work item flags
+ S Object work item busy state mask (1:pending 2:running)
and the second set of columns describe the object's cookie, if present:
@@ -395,8 +395,8 @@ and the following paired letters:
w Show objects that don't have pending writes
R Show objects that have outstanding reads
r Show objects that don't have outstanding reads
- S Show objects that have slow work queued
- s Show objects that don't have slow work queued
+ S Show objects that have work queued
+ s Show objects that don't have work queued
If neither side of a letter pair is given, then both are implied. For example:
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