[GIT PULL 00/16] perf/ebpf improvements and fixes
From: Arnaldo Carvalho de Melo
Date: Tue Nov 17 2015 - 10:32:01 EST
Hi Ingo,
This is on top of my last perf-urgent-for-mingo pull req, that is
outstanding, please check if this can get into this merge window.
- Arnaldo
The following changes since commit 092b1f0b5f9f797812da0de927c3aa26acbe8762:
perf probe: Clear probe_trace_event when add_probe_trace_event() fails (2015-11-13 12:28:09 -0300)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-ebpf-for-mingo
for you to fetch changes up to 0fbcd50e1385d3a78ddb3cf52dcdff802bfb835e:
perf test: Mute test cases error messages if verbose == 0 (2015-11-17 11:45:06 -0300)
----------------------------------------------------------------
perf/ebpf improvements and fixes:
User visible:
- Allows BPF scriptlets specify arguments to be fetched using
DWARF info, using a prologue generated at compile/build time (He Kuang, Wang Nan)
- Allow attaching BPF scriptlets to module symbols (Wang Nan)
- Allow attaching BPF scriptlets to userspace code using uprobe (Wang Nan)
- BPF programs now can specify 'perf probe' tunables via its section name,
separating key=val values using semicolons (Wang Nan)
Testing some of these new BPF features:
Use case: get callchains when receiving SSL packets, filter then in the
kernel, at arbitrary place.
# cat ssl.bpf.c
#define SEC(NAME) __attribute__((section(NAME), used))
struct pt_regs;
SEC("func=__inet_lookup_established hnum")
int func(struct pt_regs *ctx, int err, unsigned short port)
{
return err == 0 && port == 443;
}
char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
#
# perf record -a -g -e ssl.bpf.c
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.787 MB perf.data (3 samples) ]
# perf script | head -30
swapper 0 [000] 58783.268118: perf_bpf_probe:func: (ffffffff816a0f60) hnum=0x1bb
8a0f61 __inet_lookup_established (/lib/modules/4.3.0+/build/vmlinux)
896def ip_rcv_finish (/lib/modules/4.3.0+/build/vmlinux)
8976c2 ip_rcv (/lib/modules/4.3.0+/build/vmlinux)
855eba __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux)
8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux)
8572a8 process_backlog (/lib/modules/4.3.0+/build/vmlinux)
856b11 net_rx_action (/lib/modules/4.3.0+/build/vmlinux)
2a284b __do_softirq (/lib/modules/4.3.0+/build/vmlinux)
2a2ba3 irq_exit (/lib/modules/4.3.0+/build/vmlinux)
96b7a4 do_IRQ (/lib/modules/4.3.0+/build/vmlinux)
969807 ret_from_intr (/lib/modules/4.3.0+/build/vmlinux)
2dede5 cpu_startup_entry (/lib/modules/4.3.0+/build/vmlinux)
95d5bc rest_init (/lib/modules/4.3.0+/build/vmlinux)
1163ffa start_kernel ([kernel.vmlinux].init.text)
11634d7 x86_64_start_reservations ([kernel.vmlinux].init.text)
1163623 x86_64_start_kernel ([kernel.vmlinux].init.text)
qemu-system-x86 9178 [003] 58785.792417: perf_bpf_probe:func: (ffffffff816a0f60) hnum=0x1bb
8a0f61 __inet_lookup_established (/lib/modules/4.3.0+/build/vmlinux)
896def ip_rcv_finish (/lib/modules/4.3.0+/build/vmlinux)
8976c2 ip_rcv (/lib/modules/4.3.0+/build/vmlinux)
855eba __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux)
8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux)
856660 netif_receive_skb_internal (/lib/modules/4.3.0+/build/vmlinux)
8566ec netif_receive_skb_sk (/lib/modules/4.3.0+/build/vmlinux)
430a br_handle_frame_finish ([bridge])
48bc br_handle_frame ([bridge])
855f44 __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux)
8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux)
#
Use 'perf probe' various options to list functions, see what variables can
be collected at any given point, experiment first collecting without a filter,
then filter, use it together with 'perf trace', 'perf top', with or without
callchains, if it explodes, please tell us!
Infrastructure:
- Add further 'perf test' entries for BPF and LLVM (Wang Nan)
- Improve 'perf test' to suport subtests, so that the series of tests
performed in the LLVM and BPF main tests appear in the default 'perf test'
output (Wang Nan)
- Move memdup() from tools/perf to tools/lib/string.c (Arnaldo Carvalho de Melo)
- Adopt strtobool() from the kernel into tools/lib/ (Wang Nan)
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
----------------------------------------------------------------
Arnaldo Carvalho de Melo (1):
tools: Adopt memdup() from tools/perf, moving it to tools/lib/string.c
He Kuang (1):
perf bpf: Add prologue for BPF programs for fetching arguments
Wang Nan (14):
tools: Clone the kernel's strtobool function
bpf tools: Load a program with different instances using preprocessor
perf bpf: Add BPF_PROLOGUE config options for further patches
perf bpf: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on
perf bpf: Allow BPF program attach to uprobe events
perf bpf: Allow attaching BPF programs to modules symbols
perf bpf: Allow BPF program config probing options
perf bpf: Generate prologue for BPF programs
perf test: Test the BPF prologue adding infrastructure
perf test: Fix 'perf test BPF' when it fails to find a suitable vmlinux
perf bpf: Use same BPF program if arguments are identical
perf test: Print result for each LLVM subtest
perf test: Print result for each BPF subtest
perf test: Mute test cases error messages if verbose == 0
tools/include/linux/string.h | 11 +
tools/lib/bpf/libbpf.c | 146 ++++++++-
tools/lib/bpf/libbpf.h | 64 ++++
tools/lib/string.c | 62 ++++
tools/perf/MANIFEST | 2 +
tools/perf/arch/x86/util/Build | 1 +
tools/perf/config/Makefile | 12 +
tools/perf/tests/.gitignore | 1 +
tools/perf/tests/Build | 9 +-
tools/perf/tests/bpf-script-test-prologue.c | 35 +++
tools/perf/tests/bpf.c | 79 ++++-
tools/perf/tests/builtin-test.c | 134 ++++++--
tools/perf/tests/llvm.c | 67 ++--
tools/perf/tests/llvm.h | 2 +
tools/perf/tests/tests.h | 27 +-
tools/perf/util/Build | 7 +
tools/perf/util/bpf-loader.c | 434 +++++++++++++++++++++++++-
tools/perf/util/bpf-loader.h | 4 +
tools/perf/util/bpf-prologue.c | 455 ++++++++++++++++++++++++++++
tools/perf/util/bpf-prologue.h | 34 +++
tools/perf/util/include/linux/string.h | 3 -
tools/perf/util/probe-event.c | 7 +-
tools/perf/util/string.c | 16 -
23 files changed, 1502 insertions(+), 110 deletions(-)
create mode 100644 tools/include/linux/string.h
create mode 100644 tools/lib/string.c
create mode 100644 tools/perf/tests/bpf-script-test-prologue.c
create mode 100644 tools/perf/util/bpf-prologue.c
create mode 100644 tools/perf/util/bpf-prologue.h
delete mode 100644 tools/perf/util/include/linux/string.h
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