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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2006-08-28 03:17:37 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-08-30 02:36:16 +0200 |
| commit | 8ec8f2e85c6b88b4a1641eb3902275bcf2c6d60a (patch) | |
| tree | ff4d7eacba8c61f9950cbb36b0844ca53546316b /Documentation/powerpc | |
| parent | [POWERPC] Add mpc7448hpc2 device tree source file (diff) | |
| download | linux-8ec8f2e85c6b88b4a1641eb3902275bcf2c6d60a.tar.xz linux-8ec8f2e85c6b88b4a1641eb3902275bcf2c6d60a.zip | |
[POWERPC] Fix performance regression in IRQ radix tree locking
When reworking the powerpc irq code, I figured out that we were using
the radix tree in a racy way. As a temporary fix, I put a spinlock in
there. However, this can have a significant impact on performances. This
patch reworks that to use a smarter technique based on the fact that
what we need is in fact a rwlock with extremely rare writers (thus
optimized for the read path).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'Documentation/powerpc')
0 files changed, 0 insertions, 0 deletions