examples/small_demos/kmalloc2.stp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

#! /usr/bin/env stap

# Using statistics and maps to examine kernel memory allocations

global kmalloc

probe kernel.function("__kmalloc") { 
	kmalloc[execname()] <<< $size
}

# Exit after 10 seconds
probe timer.ms(10000) { exit () }

probe end {
	foreach ([name] in kmalloc) {
		printf("Allocations for %s\n", name)
		printf("Count:   %d allocations\n", @count(kmalloc[name]))
		printf("Sum:     %d Kbytes\n", @sum(kmalloc[name])/1000)
		printf("Average: %d bytes\n", @avg(kmalloc[name]))
		printf("Min:     %d bytes\n", @min(kmalloc[name]))
		printf("Max:     %d bytes\n", @max(kmalloc[name]))	
		print("\nAllocations by size in bytes\n")
		print(@hist_log(kmalloc[name]))
		printf("-------------------------------------------------------\n\n");
	}
}