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| author |   Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-09-05 17:49:17 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-09-22 13:42:33 +0200 |
| commit | 1f166e9e5c7cd5d1fe2a5da7c97c1688d4c93fbb (patch) | |
| tree | 0a5adec49f7b5b798c197cb3cc1dc92cb401b6fe /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | s390/pci_dma: improve map_sg (diff) | |
| download | wireguard-linux-1f166e9e5c7cd5d1fe2a5da7c97c1688d4c93fbb.tar.xz wireguard-linux-1f166e9e5c7cd5d1fe2a5da7c97c1688d4c93fbb.zip | |
s390/pci_dma: split dma_update_trans
Split dma_update_trans into __dma_update_trans which handles updating
the dma translation tables and __dma_purge_tlb which takes care of
purging associated entries in the dma translation lookaside buffer.
The map_sg API makes use of this split approach by calling
__dma_update_trans once per physically contiguous address range but
__dma_purge_tlb only once per dma contiguous address range.
This results in less invocations of the expensive RPCIT instruction
when using map_sg.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions