Commit 1c0ed632 authored Nov 16, 2015 by Wang Nan Committed by Arnaldo Carvalho de Melo Nov 18, 2015

perf bpf: Add BPF_PROLOGUE config options for further patches



If both LIBBPF and DWARF are detected, it is possible to create prologue
for eBPF programs to help them access kernel data. HAVE_BPF_PROLOGUE and
CONFIG_BPF_PROLOGUE are added as flags for this feature.

PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET is introduced in commit
63ab024a ("perf tools:
regs_query_register_offset() infrastructure"), which indicates that an
architecture supports converting name of a register to its offset in
'struct pt_regs'. Without this support, BPF_PROLOGUE should be turned
off.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1447675815-166222-9-git-send-email-wangnan0@huawei.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent b580563e

tools/perf/config/Makefile

+12 −0

Original line number	Diff line number	Diff line
		@@ -318,6 +318,18 @@ ifndef NO_LIBELF
		CFLAGS += -DHAVE_LIBBPF_SUPPORT
		$(call detected,CONFIG_LIBBPF)
		endif

		ifndef NO_DWARF
		ifdef PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET
		CFLAGS += -DHAVE_BPF_PROLOGUE
		$(call detected,CONFIG_BPF_PROLOGUE)
		else
		msg := $(warning BPF prologue is not supported by architecture $(ARCH), missing regs_query_register_offset());
		endif
		else
		msg := $(warning DWARF support is off, BPF prologue is disabled);
		endif

		endif # NO_LIBBPF
		endif # NO_LIBELF

Admin message