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#! /usr/bin/env stap
global traced_pid, command
global pgout, bgwriteout, kupdate
function log_event:long ()
{
return (!traced_pid || traced_pid == pid())
}
probe kernel.trace("balance_dirty_pages") # v3.2+
{
if (!log_event()) next
bgwriteout[pid()] <<< (@defined($dirtied) ? $dirtied
: (@defined($written) ? $written : $count))
command[pid()] = execname()
}
probe kernel.trace("writeback_pages_written") # v2.6.36+
{
if (!log_event()) next
kupdate[pid()] <<< (@defined($pages_written) ? $pages_written : $count)
command[pid()] = execname()
}
probe kernel.trace("mm_vmscan_writepage") # v2.6.36+
{
if (!log_event()) next
pgout[pid()] <<< 1
command[pid()] = execname()
}
probe begin {
printf("Starting data collection\n")
if (target())
printf("mode Specific Pid, traced pid: %d\n\n", target())
else
printf("mode - All Pids\n\n")
}
probe end, error {
printf("Terminating data collection\n")
printf(" Pdflush Pdflush Kupdate Kupdate Pgout\n")
printf("Command Pid count sum count sum count\n")
printf("------- --- ------- ------- ------- ------- -----\n")
foreach (pid+ in command)
printf("%-16s %10d %10d %10d %10d %10d %11d\n",
command[pid], pid,
@count(bgwriteout[pid]),
(@count(bgwriteout[pid]) ? @sum(bgwriteout[pid]) : 0),
@count(kupdate[pid]),
(@count(kupdate[pid]) ? @sum(kupdate[pid]) : 0),
@count(pgout[pid]))
}
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