diff options
| author | David Howells <dhowells@redhat.com> | 2009-02-06 13:11:21 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2009-02-06 13:11:21 +0000 |
| commit | 8a3923ac2bfcba7a98724c2546a146aaa7300fed (patch) | |
| tree | 41cfb878db43d902e2253771abb3e82d9b1b9a9a /init | |
| parent | 9be260a646bf76fa418ee519afa10196b3164681 (diff) | |
Create a dynamically sized pool of threads for doing very slow work items
Create a dynamically sized pool of threads for doing very slow work items, such
as invoking mkdir() or rmdir() - things that may take a long time and may
sleep, holding mutexes/semaphores and hogging a thread, and are thus unsuitable
for workqueues.
The number of threads is always at least a settable minimum, but more are
started when there's more work to do, up to a limit. Because of the nature of
the load, it's not suitable for a 1-thread-per-CPU type pool. A system with
one CPU may well want several threads.
This is used by FS-Cache to do slow caching operations in the background, such
as looking up, creating or deleting cache objects.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index f068071fcc5d..97b0d40968ef 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -952,6 +952,18 @@ config MARKERS source "arch/Kconfig" +config SLOW_WORK + default n + bool "Enable slow work thread pool" + help + The slow work thread pool provides a number of dynamically allocated + threads that can be used by the kernel to perform operations that + take a relatively long time. + + An example of this would be CacheFiles doing a path lookup followed + by a series of mkdirs and a create call, all of which have to touch + disk. + endmenu # General setup config HAVE_GENERIC_DMA_COHERENT |