From c5885749e4ebe568cca969d43488a233e69e6454 Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Wed, 14 Aug 2013 12:04:26 +0200 Subject: [PATCH] perf tools: Improve robustness of topology parsing code This patch improves the robustness of the build_cpu_topo() routine by allowing either the CPU parsing or the thread parsing to fail and yet get perf to produce some topology data which could be useful for the analysis. Without this patch, if the cpu parsing fails, the thread parsing is not attempted vice-versa. Signed-off-by: Stephane Eranian Cc: David Ahern Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20130814100426.GA3444@quad Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/header.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index f558f83..a33197a 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -716,18 +716,19 @@ static int build_cpu_topo(struct cpu_topo *tp, int cpu) char filename[MAXPATHLEN]; char *buf = NULL, *p; size_t len = 0; + ssize_t sret; u32 i = 0; int ret = -1; sprintf(filename, CORE_SIB_FMT, cpu); fp = fopen(filename, "r"); if (!fp) - return -1; - - if (getline(&buf, &len, fp) <= 0) - goto done; + goto try_threads; + sret = getline(&buf, &len, fp); fclose(fp); + if (sret <= 0) + goto try_threads; p = strchr(buf, '\n'); if (p) @@ -743,7 +744,9 @@ static int build_cpu_topo(struct cpu_topo *tp, int cpu) buf = NULL; len = 0; } + ret = 0; +try_threads: sprintf(filename, THRD_SIB_FMT, cpu); fp = fopen(filename, "r"); if (!fp) -- 2.7.4