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This is wanted in order to allow the NFS client to send more requests before
is has to block and wait for replies.
This is mainly useful if you have a WAN and want to ensure that the bandwidth
is being used efficiently.
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the value
of compound_decode_hdr_maxsz.
NFSv4: fix a printk() typo (spotted by Linda Dunaphant).
NFSv4: Ensure that nfs4_open_reclaim() copies the value of the new stateid back into
the shared nfsv4 state structure.
NFSv4: Don't leak NFS4ERR_WRONGSEC errors back into nfs_lookup().
RPC,NFS,Lockd: Mark the debugging code as "unlikely" so that gcc moves it out of the
mainline code paths.
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The /proc/net/rpc/*/content files now will show
entries that are still in the cache, but are either
expired or negative, as comment.
ip_map_show is enhance to work if called with a negative
or incomplete entry.
Also if cache debugging is enabled, the expiry time and
refcount of each entry will be included in a comment.
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This patch provides a "virtual class" for defining caches
that make user-space information available in the kernel
It is intended for RPC services or clients that need user-space
support for authentication.
As yet, support for userspace interaction isn't included as I want
that to be able to have separate review.
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This is the next iteration of the workqueue abstraction.
The framework includes:
- per-CPU queueing support.
on SMP there is a per-CPU worker thread (bound to its CPU) and per-CPU
work queues - this feature is completely transparent to workqueue-users.
keventd automatically uses this feature. XFS can now update to work-queues
and have the same per-CPU performance as it had with its per-CPU worker
threads.
- delayed work submission
there's a new queue_delayed_work(wq, work, delay) function and a new
schedule_delayed_work(work, delay) function. The later one is used to
correctly fix former tq_timer users. I've reverted those changes in 2.5.40
that changed tq_timer uses to schedule_work() - eg. in the case of
random.c or the tty flip queue it was definitely the wrong thing to do.
delayed work means a timer embedded in struct work_struct. I considered
using split struct work_struct and delayed_work_struct types, but lots
of code actively uses task-queues in both delayed and non-delayed mode,
so i went for the more generic approach that allows both methods of work
submission. Delayed timers do not cause any other overhead in the
normal submission path otherwise.
- multithreaded run_workqueue() implementation
the run_workqueue() function can now be called from multiple contexts, and
a worker thread will only use up a single entryy - this property is used
by the flushing code, and can potentially be used in the future to extend
the number of per-CPU worker threads.
- more reliable flushing
there's now a 'pending work' counter, which is used to accurately detect
when the last work-function has finished execution. It's also used to
correctly flush against timed requests. I'm not convinced whether the old
keventd implementation got this detail right.
- i switched the arguments of the queueing function(s) per Jeff's
suggestion, it's more straightforward this way.
Driver fixes:
i have converted almost every affected driver to the new framework. This
cleaned up tons of code. I also fixed a number of drivers that were still
using BHs (these drivers did not compile in 2.5.40).
while this means lots of changes, it might ease the QA decision whether to
put this patch into 2.5.
The pach converts roughly 80% of all tqueue-using code to workqueues - and
all the places that are not converted to workqueues yet are places that do
not compile in vanilla 2.5.40 anyway, due to unrelated changes. I've
converted a fair number of drivers that do not compile in 2.5.40, and i
think i've managed to convert every driver that compiles under 2.5.40.
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