Andrew Morton wrote:
> It still doesn't compile with gcc-2.91.66 because of the "#define
> rwsemdebug(FMT, ...)" thing. What can we do about this?
Hmmm... It probably needs to be made conditional on the version of the
compiler by means of the macros that hold the version numbers.
> I cooked
Andrea,
> As said the design of the framework to plugin per-arch rwsem implementation
> isn't flexible enough and the generic spinlocks are as well broken, try to
> use them if you can (yes I tried that for the alpha, it was just a mess and
> it was more productive to rewrite than to fix).
Ha
> I am sure ppc couldn't race (at least unless up_read/up_write were excuted
> from irq/softnet context and that never happens in 2.4.4pre3, see below ;).
This is not actually using the rwsem code I wrote at the moment.
> And incidentally the above is what (I guess Richard) did on the alpha a
> It is 36bytes. and on 64bit archs the difference is going to be less.
You're right - I can't add up (must be too late at night), and I was looking
at wait_queue not wait_queue_head. I suppose that means my implementations
are then 20 and 16 bytes respectively.
On 64-bit archs the difference
You asked for some benchmarks Andrea, so I've obtained some.
The set of test modules can be found at:
ftp://infradead.org/pub/people/dwh/rwsem-test.tar.bz2
(This also includes rwsem-stat.txt which has a copy of the benchmark results
in as well)
There are six test programs. They can b
This patch (made against linux-2.4.4-pre4) gets rid of some warnings obtained
when using the generic rwsem implementation.
David
diff -uNr linux-2.4.4-pre4/include/linux/rwsem.h linux/include/linux/rwsem.h
--- linux-2.4.4-pre4/include/linux/rwsem.h Thu Apr 19 22:07:49 2001
+++ linux/incl
This patch (made against linux-2.4.4-pre5) makes several changes to the rwsem
implementation:
(1) It fixes the bug found by Andrea by changing how processes that are
waiting on the semaphore are managed.
(2) As a result of (1), the wake_up_ctx() stuff is no longer used and has
been
Hello Andrea,
Interesting benchmarks... did you compile the test programs with "make
SCHED=yes" by any chance? Also what other software are you running?
The reason I ask is that running a full blown KDE setup running in the
background, I get the following numbers on the rwsem-ro test (XADD opt
This patch (made against linux-2.4.4-pre6) makes a number of changes to the
rwsem implementation:
(1) Everything in try #2
plus
(2) Changes proposed by Linus for the generic semaphore code.
(3) Ideas from Andrea and how he implemented his semaphores.
Linus, you suggested that the generic l
Can someone tell me what happened to the merge_segments() function in
mm/mmap.c? I was using it in my Wine accelerator module, but it's no longer
present.
Cheers,
David
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This patch (made against linux-2.4.4-pre6 + rwsem-opt3) somewhat improves
performance on the i386 XADD optimised implementation:
A patch against -pre6 can be obtained too:
ftp://infradead.org/pub/people/dwh/rwsem-pre6-opt4.diff
Here's some benchmarks (take with a pinch of salt of cours
This patch (made against linux-2.4.4-pre8) turns off module export versioning
on the rwsem symbols called from inline assembly.
David
diff -uNr linux-2.4.4-pre8/lib/rwsem.c linux-rwsem/lib/rwsem.c
--- linux-2.4.4-pre8/lib/rwsem.cFri Apr 27 20:10:11 2001
+++ linux-rwsem/lib/rwsem.c
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