Arjan van de Ven wrote:
On Mon, 2006-02-27 at 03:22 -0500, Shailabh Nagar wrote:
delayacct-swapin.patch
Record time spent by a task waiting for its pages to be swapped in.
This statistic can help in adjusting the rss limits of
tasks (process), especially relative to each other, when the system is
under memory pressure.
ok this poses a question: how do you deal with nested timings?
I don't :-(
An earlier version used local variables instead of one within the
task_delay_info
struct but we moved to using a var within to save on stack space in
critical paths.
Say an
O_SYC write which internally causes a pagefault?
And here we hit the problem of nesting being needed....so....
delayacct_timestamp_start() at minimum has to get event-type specific,
or even implement a stack of some sorts.
Would keeping the timespec vars on the stacks of the functions being
accounted be too
expensive vs. keeping bunches of vars within task_delay_info to deal
with the nesting ?
Unfortunately, the need for accuracy also means the variables needed are
timespecs and
not something smaller.
--Shailabh
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