tree 338ca7d3fa3ce6553b7b6a58bd40568a99a4a5de
parent 58cc30a4e6086d542302e04eea39b2a438e4c5dd
author Len Brown <len.brown@intel.com> 1456537862 -0500
committer Len Brown <len.brown@intel.com> 1457855740 -0400

tools/power turbostat: make fewer systems calls

skip the open(2)/close(2) on each msr read
by keeping the /dev/cpu/*/msr files open.

The remaining read(2) is generally far fewer cycles
than the removed open(2) system call.

Signed-off-by: Len Brown <len.brown@intel.com>