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Message-ID: <17633.1258758083@redhat.com>
Date: Fri, 20 Nov 2009 23:01:23 +0000
From: David Howells <dhowells@...hat.com>
To: torvalds@...l.org, akpm@...ux-foundation.org
Cc: dhowells@...hat.com, steved@...hat.com, jens.axboe@...cle.com,
linux-cachefs@...hat.com, nfsv4@...ux-nfs.org,
linux-fsdevel@...r.kernel.org, cluster-devel@...hat.com,
linux-kernel@...r.kernel.org, linux-cifs-client@...ts.samba.org
Subject: [GIT PULL v2] Fix bugs in Slow-work, FS-Cache and CacheFiles
Hi Linus,
Could you pull the attached patches before 2.6.32 please? I've added three
one-liner patches to fix some silly bugs.
For the most part these patches are bug fixes for the slow-work, FS-Cache and
CacheFiles facilities, with a few patches to produce better debugging
information, and a couple of patches to slow work from Jens that all the rest
are built on top of.
These vastly improve the stability of FS-Cache under extremely high load -
especially when the system is running out of memory regularly. I wrote a
better test case:
http://people.redhat.com/~dhowells/slurp.c
which helped enormously in reproducing these bugs. Testing has involved
running repeated invocations of slurp over five NFS4 mounted directory trees
totalling ~40GB in N file spread over 100,000 dirs on a machine with 1GB of
RAM and 4GB of disk cache space. Note that slurp, being massively parallel,
will abandon a part of the tree if it hits any error (such as ENOMEM) - so not
all the data set will necessarily be used in any particular run.
The patches can also be downloaded as:
http://people.redhat.com/~dhowells/fscache/patches/fscache-fixes.tar.bz2
The changes don't affect very much outside of FS-Cache and its dependents (NFS,
AFS and 9P), but the slow-work changes do affect CIFS and GFS2.
Thanks,
David
---
The following changes since commit 66b00a7c93ec782d118d2c03bd599cfd041e80a1:
Linus Torvalds (1):
Merge branch 'fixes' of git://git.kernel.org/.../davej/cpufreq
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-fscache.git master
David Howells (28):
SLOW_WORK: Wait for outstanding work items belonging to a module to clear
SLOW_WORK: Allow the work items to be viewed through a /proc file
SLOW_WORK: Allow the owner of a work item to determine if it is queued or not
SLOW_WORK: Allow a requeueable work item to sleep till the thread is needed
FS-Cache: Annotate slow-work runqueue proc lines for FS-Cache work items
FS-Cache: Allow the current state of all objects to be dumped
FS-Cache: Add counters for entry/exit to/from cache operation functions
FS-Cache: Clear netfs pointers in cookie after detaching object, not before
FS-Cache: Use radix tree preload correctly in tracking of pages to be stored
FS-Cache: Permit cache retrieval ops to be interrupted in the initial wait phase
FS-Cache: The object-available state can't rely on the cookie to be available
FS-Cache: Fix lock misorder in fscache_write_op()
FS-Cache: Don't delete pending pages from the page-store tracking tree
FS-Cache: Handle read request vs lookup, creation or other cache failure
FS-Cache: Handle pages pending storage that get evicted under OOM conditions
FS-Cache: Add a retirement stat counter
FS-Cache: Make sure FSCACHE_COOKIE_LOOKING_UP cleared on lookup failure
FS-Cache: Start processing an object's operations on that object's death
FS-Cache: Actually requeue an object when requested
CacheFiles: Don't write a full page if there's only a partial page to cache
CacheFiles: Handle truncate unlocking the page we're reading
CacheFiles: Mark parent directory locks as I_MUTEX_PARENT to keep lockdep happy
CacheFiles: Better showing of debugging information in active object problems
CacheFiles: Catch an overly long wait for an old active object
CacheFiles: Don't log lookup/create failing with ENOBUFS
SLOW_WORK: Fix CIFS to pass THIS_MODULE to slow_work_register_user()
SLOW_WORK: Fix GFS2 to #include <linux/module.h> before using THIS_MODULE
FS-Cache: Provide nop fscache_stat_d() if CONFIG_FSCACHE_STATS=n
Jens Axboe (3):
SLOW_WORK: Make slow_work_ops ->get_ref/->put_ref optional
SLOW_WORK: Add support for cancellation of slow work
SLOW_WORK: Add delayed_slow_work support
Documentation/filesystems/caching/fscache.txt | 110 +++++
Documentation/filesystems/caching/netfs-api.txt | 21 +-
Documentation/slow-work.txt | 160 +++++++-
fs/9p/cache.c | 14 +-
fs/afs/file.c | 15 +-
fs/cachefiles/interface.c | 32 ++-
fs/cachefiles/namei.c | 187 +++++++--
fs/cachefiles/rdwr.c | 128 ++++++-
fs/cifs/cifsfs.c | 2 +-
fs/fscache/Kconfig | 7 +
fs/fscache/Makefile | 1 +
fs/fscache/cache.c | 5 +
fs/fscache/cookie.c | 26 +-
fs/fscache/internal.h | 56 +++
fs/fscache/main.c | 6 +-
fs/fscache/object-list.c | 432 ++++++++++++++++++++
fs/fscache/object.c | 104 +++++-
fs/fscache/operation.c | 120 +++++--
fs/fscache/page.c | 273 ++++++++++---
fs/fscache/proc.c | 13 +
fs/fscache/stats.c | 94 ++++-
fs/gfs2/main.c | 4 +-
fs/gfs2/recovery.c | 2 +
fs/nfs/fscache.c | 10 +-
include/linux/fscache-cache.h | 40 ++-
include/linux/fscache.h | 27 ++
include/linux/slow-work.h | 72 ++++-
init/Kconfig | 10 +
kernel/Makefile | 1 +
kernel/slow-work-proc.c | 227 +++++++++++
kernel/slow-work.c | 494 +++++++++++++++++++++--
kernel/slow-work.h | 72 ++++
lib/radix-tree.c | 5 +-
33 files changed, 2505 insertions(+), 265 deletions(-)
create mode 100644 fs/fscache/object-list.c
create mode 100644 kernel/slow-work-proc.c
create mode 100644 kernel/slow-work.h
--
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