Hello,
On my 2.2.15 systems, /proc/pid/statm consistently reports zero for number of
pages that are library. Looking at the code (fs/proc/array.c):
while (vma) {
pgd_t *pgd = pgd_offset(tsk->mm, vma->vm_start);
int pages = 0, shared = 0, dirty = 0, total = 0;
statm_pgd_range(pgd, vma->vm_start, vma->vm_end, &pages, &shared, &dirty, &total);
resident += pages;
share += shared;
dt += dirty;
size += total;
if (vma->vm_flags & VM_EXECUTABLE)
trs += pages; /* text */
else if (vma->vm_flags & VM_GROWSDOWN)
drs += pages; /* stack */
else if (vma->vm_end > 0x60000000)
lrs += pages; /* library */
else
drs += pages;
vma = vma->vm_next;
}
We see that it counts all pages above 0x60000000 as library. However,
on my systems, library is mapped to 0x40000000.
Simply changing the value to 0x40000000 causes statm to report correct(er)
values. However, it seems that this hueristic is awful dependant upon the
userspace library mapping. Is there a better way to check that a page is
library data?
-Jon
BTW: The documentation for proc lists the values for statm in the wrong order.
drs and lrs should be swapped.
-
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