From 0b8c25d949e010274c6697c570b772797ebc7c27 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Sun, 28 Jul 2013 09:48:32 -0600 Subject: perf tools: Fix symbol offset computation for some dsos For some dsos (e.g., libc, libpthread, kernel modules) the symbol offset is huge. e.g., qemu-kvm 17238/17242 [007] 762235.640311: ffffffff816288a1 __schedule+0x451 ([kernel.kallsyms]) ffffffff81629609 schedule+0x29 ([kernel.kallsyms]) ffffffffa00a6ded kvm_vcpu_block+0xffffffffa00a106d (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00bae6b kvm_arch_vcpu_ioctl_run+0xffffffffa00a118b (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00a4d7a kvm_vcpu_ioctl+0xffffffffa00a141a (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffff811a7bdb do_vfs_ioctl+0x8b ([kernel.kallsyms]) ffffffff811a80c1 sys_ioctl+0x91 ([kernel.kallsyms]) ffffffff81633182 system_call+0x72 ([kernel.kallsyms]) 7f882a97af27 __GI___ioctl+0x7f882a891007 (/lib64/libc-2.14.90.so) 100000002 [unknown] ([unknown]) It seems to be maps with a non-0 start. Taking that into account the offsets are correct: qemu-kvm 17238/17242 [007] 762235.640311: ffffffff816288a1 __schedule+0x451 ([kernel.kallsyms]) ffffffff81629609 schedule+0x29 ([kernel.kallsyms]) ffffffffa00a6ded kvm_vcpu_block+0x6d (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00bae6b kvm_arch_vcpu_ioctl_run+0x18b (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffffa00a4d7a kvm_vcpu_ioctl+0x41a (/lib/modules/3.11.0-rc1+/kernel/arch/x86/kvm/kvm.ko) ffffffff811a7bdb do_vfs_ioctl+0x8b ([kernel.kallsyms]) ffffffff811a80c1 sys_ioctl+0x91 ([kernel.kallsyms]) ffffffff81633182 system_call+0x72 ([kernel.kallsyms]) 7f882a97af27 __GI___ioctl+0x7 (/lib64/libc-2.14.90.so) 100000002 [unknown] ([unknown]) Signed-off-by: David Ahern Link: http://lkml.kernel.org/r/1375026512-45826-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/session.c | 1 + tools/perf/util/symbol.c | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'tools') diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 07642a7b9346..1fc0c628683e 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1513,6 +1513,7 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event, printf(" "); if (print_symoffset) { al.addr = node->ip; + al.map = node->map; symbol__fprintf_symname_offs(node->sym, &al, stdout); } else symbol__fprintf_symname(node->sym, stdout); diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 77f3b95bb46d..7eb0362f4ffd 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -259,7 +259,10 @@ size_t symbol__fprintf_symname_offs(const struct symbol *sym, if (sym && sym->name) { length = fprintf(fp, "%s", sym->name); if (al) { - offset = al->addr - sym->start; + if (al->addr < sym->end) + offset = al->addr - sym->start; + else + offset = al->addr - al->map->start - sym->start; length += fprintf(fp, "+0x%lx", offset); } return length; -- cgit v1.2.3-59-g8ed1b