Sli max latency is lightweight latency monitor metrics, the monitor
tool could get the data with a little overhead. And the accuracy of
the metrics is controlled by the sampling frequency of the monitor
tool. When the performance jitter was occurred in the system, we can
get some help from these lateny metris.
Signed-off-by: Bin Lai <robinlai@tencent.com>
Reviewed-by: benbjiang<benbjiang@tencent.com>
Reviewed-by: Mengmeng Chen <bauerchen@tencent.com>
Reviewed-by: mungerjiang <mungerjiang@tencent.com>
When a process is running in the system space, it cann't be preempted until
it return to userspace, even if the process should be reschedule and other
process was ready to run(because the server system close the kernel preempt
by default). This schedule delay may impact the performance of waiting process,
therefor we introduce the longsys check to collect the schedule delay information
of process. The longsys indication could help us spot the possible performance
jitter in the system.
Signed-off-by: Munger jiang <mungerjiang@tencent.com>
Signed-off-by: Bin Lai <robinlai@tencent.com>
Reviewed-by: benbjiang<benbjiang@tencent.com>
Reviewed-by: Bauerchen <bauerchen@tencent.com>
Bin Lai