Hi
I have a Dtrace script ( attached ) which examines memory usage, using
fbt:genunix:anon_resvmem:entry & return
On my T2000 it totals the 65k pages being reserved by my application,
printing out the total in bytes.
Seems to work well, tested with a small app that malloced < 65 K,
malloced 200M and mmapeed a 16M file and it appeared to get things correct.
Could I just get a second pair of eyes to eyeball it.
Basically I am looking at an app that seems to wander off the
reservation in terms of memory usage, so wanted to rule out any bugs in
the script.
I have the app compiled in debug ( -g ) so non-stripped, is there a way
to get the stack of the calling app at the point in time of the
anon_resvmem:entry & return.
Any help appreciated
Enda
#!/usr/sbin/dtrace -ws
#pragma D option dynvarsize=20m
#pragma D option quiet
/* 1 - Default output
** 2 - Timestamp output (includes TIME)
** 3 - Everything, space delimited (for spreadsheets)
*/
/*
** Print header
*/
dtrace:::BEGIN{
total[pid]=(long long)0;
printf("%5s %5s %9s %s\n","UID","PID","TOTAL","ARGS");
}
/*
** Main
*/
fbt:genunix:anon_resvmem:entry
/arg1 != 0/
{
/* Store values for a reservation of anon mem */
self->size = (long long)arg0;
self->uid = curpsinfo->pr_euid;
self->pid = pid;
self->args = (char *)curpsinfo->pr_psargs;
self->on=1;
}
fbt:genunix:anon_resvmem:return
/self->args != NULL && arg1 != 0 && self->on/
{
/* Increment total anon mem if successful */
total[self->pid] += (long long )self->size;
printf("%5d %5d %9d %s\n",
self->uid,self->pid,total[self->pid],stringof(self->args));
self->size = 0;
self->pid = 0;
self->uid = 0;
self->args = NULL;
self->on=0;
}
fbt:genunix:anon_unresvmem:entry
/self->size > 0/
{
printf("in free\n");
/* Decrement anon mem for unreservations */
self->size=(long long)self->size;
self->uid = curpsinfo->pr_euid;
self->pid = pid;
self->args = (char *)curpsinfo->pr_psargs;
self->on=1;
}
fbt:genunix:anon_unresvmem:return
/self->on/
{
total[pid] -= (long long)self->size;
self->on=0;
printf("%5d %5d %9d %s\n",
self->uid,self->pid,total[self->pid],stringof(self->args));
self->size = 0;
self->pid = 0;
self->uid = 0;
self->args = NULL;
}
syscall::rexit:entry
{
total[pid] = 0;
}
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