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| author |   Jan Glauber <jang@linux.vnet.ibm.com> | 2012-12-06 14:30:28 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-12-11 14:52:42 +0100 |
| commit | 87bc359b9822a73f264f24f3c1b3e4e7e5ed7d72 (patch) | |
| tree | 643e20ebffcf7eda13ad33c1bbeba82b306738c4 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | s390/pci: enable NEED_DMA_MAP_STATE (diff) | |
| download | linux-dev-87bc359b9822a73f264f24f3c1b3e4e7e5ed7d72.tar.xz linux-dev-87bc359b9822a73f264f24f3c1b3e4e7e5ed7d72.zip | |
s390/pci: speed up __iowrite64_copy by using pci store block insn
Benefit from pci store block instruction by writing up to 128 bytes
with a single instruction to MMIO space. Depending on the workload
this can result in a huge performance increase due to the reduced
number of instructions. The ordering guarantees of single stores
vs. one store block are identical.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions