Hi all,
I am trying to learn /proc/<pid>/stat file contents. And when I come across two labels
user mode jiffies
kernel mode jiffies
I try to google for jiffies, and I got this data.
Quote:
An incrementing counter representing system "uptime" in ticks - or the number of timer interrupts since boot. Ultimately the entire original concept of a jiffy will likely vanish as systems use timer events only when necessary and become "jiffyless".
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What this tells me is that jiffies is a global variable that starts from zero and increments in each clock intervals(cycle).I didnt understand the second sentense in that quote.
Also why process have user mode jiffies and kernel mode jiffies. if these times tell how many times this process executed in user space and in kernel space(system calls) respectively ? Please help