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From: Jiri Olsa <jolsa@redhat.com>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Andi Kleen <ak@linux.intel.com>, Song Liu <songliubraving@fb.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>
Subject: Re: [PATCH 11/12] perf tools: Reuse shared eBPF dso objects
Date: Wed, 17 Apr 2019 08:51:27 +0200	[thread overview]
Message-ID: <20190417065127.GA17024@krava> (raw)
In-Reply-To: <746f02e3-a509-5081-8427-b610e52c1fb0@intel.com>

On Wed, Apr 17, 2019 at 09:35:32AM +0300, Adrian Hunter wrote:
> On 16/04/19 7:01 PM, Jiri Olsa wrote:
> > The eBPF program can be loaded multiple times
> > with the same name (tag). We can share dso
> > objects for those programs.
> 
> Doesn't a eBPF program get recompiled differently every time it is loaded?

yes, but those with same tag are identical

jirka

> 
> > 
> > Link: http://lkml.kernel.org/n/tip-3damf8vq1dryhtpbk5b06jpt@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@kernel.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);
> >  	}
> > 
> 

  reply	other threads:[~2019-04-17  6:51 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16 16:01 [PATCH 00/12] perf tools: Display eBPF code in intel_pt trace Jiri Olsa
2019-04-16 16:01 ` [PATCH 01/12] perf tools: Separate generic code in dso__data_file_size Jiri Olsa
2019-04-16 16:01 ` [PATCH 02/12] perf tools: Separate generic code in dso_cache__read Jiri Olsa
2019-04-16 17:17   ` Stanislav Fomichev
2019-04-16 18:21     ` Jiri Olsa
2019-04-16 16:01 ` [PATCH 03/12] perf tools: Simplify dso_cache__read function Jiri Olsa
2019-04-16 16:01 ` [PATCH 04/12] perf tools: Add bpf dso read and size hooks Jiri Olsa
2019-04-16 16:01 ` [PATCH 05/12] perf tools: Read also the end of the kernel Jiri Olsa
2019-04-16 16:01 ` [PATCH 06/12] perf tools: Do not erase uncovered maps by kcore Jiri Olsa
2019-04-23  9:32   ` Adrian Hunter
2019-04-23 14:55     ` Jiri Olsa
2019-04-16 16:01 ` [PATCH 07/12] perf tools: Check maps for bpf programs Jiri Olsa
2019-04-16 19:31   ` Arnaldo Carvalho de Melo
2019-04-19 17:18   ` [tip:perf/urgent] " tip-bot for Song Liu
2019-04-16 16:01 ` [PATCH 08/12] perf tools: Fix side band thread draining Jiri Olsa
2019-04-16 19:33   ` Arnaldo Carvalho de Melo
2019-04-16 20:41   ` Song Liu
2019-04-19 17:19   ` [tip:perf/urgent] perf evlist: " tip-bot for Jiri Olsa
2019-04-16 16:01 ` [PATCH 09/12] perf tools: Fix map reference counting Jiri Olsa
2019-04-16 19:36   ` Arnaldo Carvalho de Melo
2019-04-19 17:20   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2019-04-16 16:01 ` [PATCH 10/12] perf tools: Keep zero in pgoff bpf map Jiri Olsa
2019-04-16 16:01 ` [PATCH 11/12] perf tools: Reuse shared eBPF dso objects Jiri Olsa
2019-04-17  6:35   ` Adrian Hunter
2019-04-17  6:51     ` Jiri Olsa [this message]
2019-04-17  6:55       ` Adrian Hunter
2019-04-17  7:32         ` Jiri Olsa
2019-04-17 16:56           ` Song Liu
2019-04-16 16:01 ` [PATCH 12/12] perf script: Pad dso name for --call-trace Jiri Olsa

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