Hi!
Below is what Matt asked me to do:
To reduce the expense you could aggregate the pv_list_count values together and
store a grand total for each vm_object. Then the RSS calculation could divide
the grand total for each vm_object by the number of resident vm_pages for that
object to get a rough proportion.
But after Aggelos asked me to do the division reverse, I got confused. So, I am
writing below the solution what I think of would be feasible.
If their is a Process P' and assuming it has only a single
object O'. Suppose, O' has 1000 pages in memory i.e. the resident page count.
Now, if all this 1000 pages each have pv_list_count 3 i.e. each page is shared
by 3 processes (2 processes apart from P'). So the agg_pv_list_count will be
3000 and the resident_page_count is 1000.
Now if I divide agg_*/resident_* it will be 3000/1000 i.e. I get that approx 3
process are sharing that object and should then divide res*/3 to get the
proportional RSS.
Here is the glimpse :
if(object->resident_page_count != 0) {
n_pv_entry = (object->agg_pv_list_count /
object->resident_page_count);
if(n_pv_entry != 0) {
count += (object->resident_page_count /
n_pv_entry);
}
}
Top output (copy-paste discarding garbage) >
The command section shows firefox-bin on third line, please check the output of
PRES which is weird. Should I try something different.
load averages: 0.11, 0.09, 0.03; up 0+00:05:23 10:56:32
30 processes: 1 running, 30 active
CPU states: 0.7% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.3% idle
Memory: 46M Active, 30M Inact, 143M Wired, 82M Buf, 1781M Free
Swap: 2048M Total, 2048M Free
PID USERNAME PRI NICE SIZE RES PRES STATE TIME CTIME CPU COMMAND
750 root 152 0 154M 21M 10M kqread 0:09 0:09 1.56% Xorg
798 root 152 0 3948K 1892K 1580K RUN 0:00 0:00 1.32% top
->785 root 152 0 63M 54M 107M kqread 0:07 0:07 0.00%
firefox-bin
761 root 152 0 9108K 5060K 1432K kqread 0:00 0:00 0.00%
fluxbox
777 root 152 0 12M 7392K 2492K kqread 0:00 0:00 0.00% urxvt
760 root 152 0 13M 9128K 5016K kqread 0:00 0:00 0.00% idesk
719 root 156 0 3024K 1504K 456K wait 0:00 0:00 0.00% login
727 root 153 0 3888K 1556K 764K pause 0:00 0:00 0.00% csh
792 root 152 0 6828K 3300K 1084K kqread 0:00 0:00 0.00%
gconfd-2
775 root 155 0 3104K 1284K 492K pause 0:00 0:00 0.00% csh
778 root 152 0 3696K 1652K 700K pause 0:00 0:00 0.00% csh
345 root 152 0 1952K 1016K 220K kqread 0:00 0:00 0.00%
syslogd
Have a good Day ...
-Pratyush
<pratyush.kshirsagar [at] gmail.com>
