are
something we want to tackle in 2.5.x? 4MB page mappings on x86
could be cool too, as an option...
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dirty bit psmp race atch
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Please read the FAQ at http://www.tux.org/lkml/
, the buffer
cache will be used less and less, as things like directory entries are
moved into the page cache.
You probably want to start looking at the various kernel guides
and read up on the difference between the page cache and buffer
cache, that's the best place to start.
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trying
to help debug the new VM on that machine that just so happens to use
that chipset, and it's hard to do that when it doesn't boot at all. :)
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wouldn't trip
up and cause a panic blocking waiting for more memory, but that's
because you've been lucky so far..
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the body of
patch for 2.2. Replay if you
need a recent one against 2.2.17, I have it.
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Please read the F
once, use a spinlock, it's the least expensive lock
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Please read the FAQ at http://www.tux.org/lkml/
if anything kernel side is
broken it must be fairly obscure or a little used driver
I've been using 2.95.2 to build PPC kernels and it seems to work
OK, but I _know_ that 2.91.66 works with both 2.2 and 2.4 kernels so it should
probably be the recommended one. :)
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it along. This provides a *nearly*
compatible solution to 2.4, and it's much cleaner than driver-specific
hacks.
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, it's unfortunate there's
still no good interface to map kernel buffers to user space either...
Something to work on for 2.5 I guess.
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cache
would suffice, and with the benefit that all page flushing could
then be done through the VM and bdflush eliminated.
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"=m" (current-lock_depth));
#endif
}
Can someone explain what is behind lock_kernel() and
these changes (#if 1) in 2.4 ?
Is there any documentation for this out there ?
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or you'll run over in your S/G.
unmap_kiobuf() to unmap the kiobuf and unpin the pages
If you do a lot of DMA I/O with large buffers you'll need to apply
the 22vmfix patch in the same directory or you'll run out memory
and things will start to be OOM killed.
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u think pageable page tables are
something we want to tackle in 2.5.x? 4MB page mappings on x86
could be cool too, as an option...
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page as
PAGE_SIZE-iobuf->offset or you'll run over in your S/G.
unmap_kiobuf() to unmap the kiobuf and unpin the pages
If you do a lot of DMA I/O with large buffers you'll need to apply
the 22vmfix patch in the same directory or you'll run out memory
and things will start to be OOM killed.
ATCH] 2.2.18pre5 version of pte dirty bit psmp race atch
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Please read the FAQ at http://www.tux.org/lkml/
In future versions of the kernel, the buffer
cache will be used less and less, as things like directory entries are
moved into the page cache.
You probably want to start looking at the various kernel guides
and read up on the difference between the page cache and buffer
cache, that's the best place to st
nice to see it fixed though, I'm trying
to help debug the new VM on that machine that just so happens to use
that chipset, and it's hard to do that when it doesn't boot at all. :)
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FibreChannel Software Engineer, Systran Corporation
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l
module.. The size is small enough it probably wouldn't trip
up and cause a panic blocking waiting for more memory, but that's
because you've been lucky so far..
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of the raw I/O patch for 2.2. Replay if you
need a recent one against 2.2.17, I have it.
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Software Engineer, Systran Corporation
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Pleas
+begin ; count = end-start)
-if you have to update begin/end non-atomically and check them
only once, use a spinlock, it's the least expensive lock
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at the point where if anything kernel side is
> broken it must be fairly obscure or a little used driver
I've been using 2.95.2 to build PPC kernels and it seems to work
OK, but I _know_ that 2.91.66 works with both 2.2 and 2.4 kernels so it should
probably be the recommended one. :)
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Eric L
2.17 (with bugfixes), anyone who
needs it e-mail me and I'll send it along. This provides a *nearly*
compatible solution to 2.4, and it's much cleaner than driver-specific
hacks.
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Eric Lowe
Software Engineer, Systran Corporation
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erience has been that systems that do a lot
of page pinning in UNIX for I/O don't gain much in performance
anyway, but it _really_ puts a lot of stress on the system compared
to doing it the right way.
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s no way to do this without mmap().
With kiobufs() still being somewhat iffy, it's unfortunate there's
still no good interface to map kernel buffers to user space either...
Something to work on for 2.5 I guess.
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Eric Lowe
Software Engineer, Systran Corporation
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e that we should ever try to do kiobuf() things in
the read/write general case. I think that mapping files into
kernel buffers and copying the pages to/from the page cache
would suffice, and with the benefit that all page flushing could
then be done through the VM and bdflush eliminated.
--
Eric
:"=m" (__dummy_lock(_flag)),
> "=m" (current->lock_depth));
> #endif
> }
>
> Can someone explain what is behind lock_kernel() and
> these changes (#if 1) in 2.4 ?
>
> Is there any documentation for this out there
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