linux-kernel - [PATCH 11/12] perf tools: Reuse shared eBPF dso objects

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Date:   Tue, 16 Apr 2019 18:01:26 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Song Liu <songliubraving@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH 11/12] perf tools: Reuse shared eBPF dso objects

The eBPF program can be loaded multiple times
with the same name (tag). We can share dso
objects for those programs.

Link: http://lkml.kernel.org/n/tip-3damf8vq1dryhtpbk5b06jpt@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/machine.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index d4aa44489011..a60653827891 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -23,6 +23,7 @@
 #include "linux/hash.h"
 #include "asm/bug.h"
 #include "bpf-event.h"
+#include "dso.h"
 
 #include "sane_ctype.h"
 #include <symbol/kallsyms.h>
@@ -699,11 +700,18 @@ static int machine__process_ksymbol_register(struct machine *machine,
 
 	map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
 	if (!map) {
-		map = dso__new_map(event->ksymbol_event.name);
-		if (!map)
+		struct dso *dso;
+
+		dso = dsos__findnew(&machine->dsos, event->ksymbol_event.name);
+		if (!dso)
 			return -ENOMEM;
 
-		map->start = event->ksymbol_event.addr;
+		map = map__new2(event->ksymbol_event.addr, dso);
+		if (!map) {
+			dso__put(dso);
+			return -ENOMEM;
+		}
+
 		map->end = map->start + event->ksymbol_event.len;
 		map_groups__insert(&machine->kmaps, map);
 	}
-- 
2.17.2