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linux/samples/bpf
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Alexei Starovoitov 9811e35359 samples/bpf: Add kmem_alloc()/free() tracker tool 
One BPF program attaches to kmem_cache_alloc_node() and
remembers all allocated objects in the map.
Another program attaches to kmem_cache_free() and deletes
corresponding object from the map.

User space walks the map every second and prints any objects
which are older than 1 second.

Usage:

	$ sudo tracex4

Then start few long living processes. The 'tracex4' will print
something like this:

	obj 0xffff880465928000 is 13sec old was allocated at ip ffffffff8105dc32
	obj 0xffff88043181c280 is 13sec old was allocated at ip ffffffff8105dc32
	obj 0xffff880465848000 is  8sec old was allocated at ip ffffffff8105dc32
	obj 0xffff8804338bc280 is 15sec old was allocated at ip ffffffff8105dc32

	$ addr2line -fispe vmlinux ffffffff8105dc32
	do_fork at fork.c:1665

As soon as processes exit the memory is reclaimed and 'tracex4'
prints nothing.

Similar experiment can be done with the __kmalloc()/kfree() pair.

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1427312966-8434-10-git-send-email-ast@plumgrid.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-04-02 13:25:51 +02:00
..
bpf_helpers.h samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
bpf_load.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
bpf_load.h samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
libbpf.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
libbpf.h samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
Makefile samples/bpf: Add kmem_alloc()/free() tracker tool 2015-04-02 13:25:51 +02:00
sock_example.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
sockex1_kern.c samples: bpf: trivial eBPF program in C 2014-12-05 21:47:33 -08:00
sockex1_user.c samples: bpf: trivial eBPF program in C 2014-12-05 21:47:33 -08:00
sockex2_kern.c samples: bpf: large eBPF program in C 2014-12-05 21:47:34 -08:00
sockex2_user.c samples: bpf: large eBPF program in C 2014-12-05 21:47:34 -08:00
test_maps.c samples: bpf: relax test_maps check 2015-01-26 17:20:40 -08:00
test_verifier.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
tracex1_kern.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
tracex1_user.c samples/bpf: Add simple non-portable kprobe filter example 2015-04-02 13:25:50 +02:00
tracex2_kern.c samples/bpf: Add counting example for kfree_skb() function calls and the write() syscall 2015-04-02 13:25:50 +02:00
tracex2_user.c samples/bpf: Add counting example for kfree_skb() function calls and the write() syscall 2015-04-02 13:25:50 +02:00
tracex3_kern.c samples/bpf: Add IO latency analysis (iosnoop/heatmap) tool 2015-04-02 13:25:51 +02:00
tracex3_user.c samples/bpf: Add IO latency analysis (iosnoop/heatmap) tool 2015-04-02 13:25:51 +02:00
tracex4_kern.c samples/bpf: Add kmem_alloc()/free() tracker tool 2015-04-02 13:25:51 +02:00
tracex4_user.c samples/bpf: Add kmem_alloc()/free() tracker tool 2015-04-02 13:25:51 +02:00