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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-09-05 14:45:51 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-11-06 10:41:38 +0530 |
| commit | d4599baf5c773660f32ee6bc35c1afab009a52d9 (patch) | |
| tree | e7538e616f56ceade60bd63833df965afbcc50b0 /arch/arc/mm/fault.c | |
| parent | bd12976c366486ea90aebd83f1cf2863ee47c76a (diff) | |
ARC: cacheflush optim - PTAG can be loop invariant if V-P is const
Line op needs vaddr (indexing) and paddr (tag match). For page sized
flushes (V-P const), each line op will need a different index, but the
tag bits wil remain constant, hence paddr can be setup once outside the
loop.
This improves select LMBench numbers for Aliasing dcache where we have
more "preventive" cache flushing.
Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host OS Mhz null null open slct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
3.11-rc7- Linux 3.11.0- 80 4.66 8.88 69.7 112. 268. 8.60 28.0 3489 13.K 27.K # Non alias ARC700
3.11-rc7- Linux 3.11.0- 80 4.64 8.51 68.6 98.5 271. 8.58 28.1 4160 15.K 32.K # Aliasing
3.11-rc7- Linux 3.11.0- 80 4.64 8.51 69.8 99.4 270. 8.73 27.5 3880 15.K 31.K # PTAG loop Inv
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm/fault.c')
0 files changed, 0 insertions, 0 deletions