diff options
| author | Alexei Starovoitov <ast@plumgrid.com> | 2015-03-25 12:49:26 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-02 13:25:51 +0200 |
| commit | 9811e35359d4b18baf5bb603b225e957255b9c46 (patch) | |
| tree | ba65e75bc85cb6e570a17a48408b202161bbcd05 /samples/bpf/Makefile | |
| parent | 5c7fc2d27d004f28f3a94b35edd40e68f779e35a (diff) | |
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>
Diffstat (limited to 'samples/bpf/Makefile')
| -rw-r--r-- | samples/bpf/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index dcd850546d52..fe98fb226e6e 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -9,6 +9,7 @@ hostprogs-y += sockex2 hostprogs-y += tracex1 hostprogs-y += tracex2 hostprogs-y += tracex3 +hostprogs-y += tracex4 test_verifier-objs := test_verifier.o libbpf.o test_maps-objs := test_maps.o libbpf.o @@ -18,6 +19,7 @@ sockex2-objs := bpf_load.o libbpf.o sockex2_user.o tracex1-objs := bpf_load.o libbpf.o tracex1_user.o tracex2-objs := bpf_load.o libbpf.o tracex2_user.o tracex3-objs := bpf_load.o libbpf.o tracex3_user.o +tracex4-objs := bpf_load.o libbpf.o tracex4_user.o # Tell kbuild to always build the programs always := $(hostprogs-y) @@ -26,6 +28,7 @@ always += sockex2_kern.o always += tracex1_kern.o always += tracex2_kern.o always += tracex3_kern.o +always += tracex4_kern.o HOSTCFLAGS += -I$(objtree)/usr/include @@ -35,6 +38,7 @@ HOSTLOADLIBES_sockex2 += -lelf HOSTLOADLIBES_tracex1 += -lelf HOSTLOADLIBES_tracex2 += -lelf HOSTLOADLIBES_tracex3 += -lelf +HOSTLOADLIBES_tracex4 += -lelf -lrt # point this to your LLVM backend with bpf support LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc |