From 841e3558b2de6d8c53dae4f01c7a81cd53e42e5c Mon Sep 17 00:00:00 2001 From: He Kuang Date: Fri, 6 May 2016 08:59:07 +0000 Subject: [PATCH] perf callchain: Recording 'dwarf' callchains do not need DWARF unwinding support There is no need to check for DWARF unwinding support when using the 'dwarf' callchain record method, as this will only ask the kernel to collect stack dumps for later DWARF CFI processing, which can be done in another machine, where the support for DWARF unwinding need to be present. Signed-off-by: He Kuang Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: David Ahern Cc: Ekaterina Tumanova Cc: Josh Poimboeuf Cc: Kan Liang Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Sukadev Bhattiprolu Cc: Wang Nan Link: http://lkml.kernel.org/r/1462525154-125656-2-git-send-email-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/util.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 619ba2061b62..01c9433de7ef 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -507,7 +507,6 @@ int parse_callchain_record(const char *arg, struct callchain_param *param) "needed for --call-graph fp\n"); break; -#ifdef HAVE_DWARF_UNWIND_SUPPORT /* Dwarf style */ } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) { const unsigned long default_stack_dump_size = 8192; @@ -523,7 +522,6 @@ int parse_callchain_record(const char *arg, struct callchain_param *param) ret = get_stack_size(tok, &size); param->dump_size = size; } -#endif /* HAVE_DWARF_UNWIND_SUPPORT */ } else if (!strncmp(name, "lbr", sizeof("lbr"))) { if (!strtok_r(NULL, ",", &saveptr)) { param->record_mode = CALLCHAIN_LBR; -- 2.20.1