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It's need to run systemtap util for loading kernel module. This kernel module capture context switch timestamp and systemtap store it in the temp file. Before running profiling application you should run systemtap script with root privileges as following: \# stap -o /tmp/cs_profiling_info.log scripts/context_switch_logger.stp name APPLICATION_NAME where APPLICATION_NAME is profiling application
37 lines
836 B
Plaintext
37 lines
836 B
Plaintext
global target_pid
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global target_name
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probe scheduler.ctxswitch {
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if (target_pid != 0
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&& next_pid != target_pid
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&& prev_pid != target_pid)
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next
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if (target_name != ""
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&& prev_task_name != target_name
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&& next_task_name != target_name)
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next
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//printf("Switch from %d(%s) to %d(%s) at %d\n",prev_tid, prev_task_name,next_tid,next_task_name, gettimeofday_ns())
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printf("%d %d %d\n",gettimeofday_ns(),prev_tid, next_tid )
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}
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probe begin
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{
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target_pid = 0
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target_name = ""
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%( $# == 1 || $# > 2 %?
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log("Wrong number of arguments, use none, 'pid nr' or 'name proc'")
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exit()
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%)
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%( $# == 2 %?
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if(@1 == "pid")
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target_pid = strtol(@2, 10)
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if(@1 == "name")
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target_name = @2
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%)
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}
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