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| author | Sebastian Sanchez <sebastian.sanchez@intel.com> | 2017-05-04 15:14:16 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2017-05-05 02:31:46 +0300 |
| commit | ade6f8af52f5187e6af6f774cff43e0bc60902e4 (patch) | |
| tree | 8f880ec8392c437e83c3e3a48e27711b596aa532 /drivers/mfd/tps65090.c | |
| parent | dd1ed1081750a1ce4daeeb53a0ae91af599ecdad (diff) | |
| download | linux-ade6f8af52f5187e6af6f774cff43e0bc60902e4.tar.xz | |
IB/hfi1: Get rid of divide when setting the tx request header
Div instructions show costly in profiles when
the tx request header is set. Using right shift
instead of a divide operation reduces the cycles
spent in the function that sets the tx request
header as shown in the profile. Use right shift
operation instead.
Profile before change:
43.24% 009
|
|--23.41%-- user_sdma_send_pkts
| |
| |--99.90%-- hfi1_user_sdma_process_requestAfter:
Profile after change:
45.75% 009
|
|--14.81%-- user_sdma_send_pkts
| |
| |--99.95%-- hfi1_user_sdma_process_request
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/mfd/tps65090.c')
0 files changed, 0 insertions, 0 deletions