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author | Peter Maydell | 2014-05-13 17:09:38 +0200 |
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committer | Peter Maydell | 2014-05-13 17:09:38 +0200 |
commit | 2f0d8631b74c873c8867a7b509335bc2bf8d8886 (patch) | |
tree | a3f384c8b4bfc7adba1ed83d1de2f94affe6ed06 /target-arm/neon_helper.c | |
parent | hw/net/stellaris_enet: Convert to vmstate (diff) | |
download | qemu-2f0d8631b74c873c8867a7b509335bc2bf8d8886.tar.gz qemu-2f0d8631b74c873c8867a7b509335bc2bf8d8886.tar.xz qemu-2f0d8631b74c873c8867a7b509335bc2bf8d8886.zip |
target-arm/helper.c: Don't flush the TLB if SCTLR is rewritten unchanged
Linux makes a habit of writing the same value to the SCTLR that it
already holds. In a sample boot of the kernel to a shell prompt
it wrote the SCTLR with the value it already held 325465 times,
and wrote different values just 3 times.
Skip flushing the TLB if the SCTLR value isn't actually being changed;
this speeds up my sample boot by 3-5%.
Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1399560029-19007-1-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'target-arm/neon_helper.c')
0 files changed, 0 insertions, 0 deletions