Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Date:   Mon, 30 Mar 2020 10:18:10 -0300
To:     Kemeng Shi <shikemeng@huawei.com>
Cc:     linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com,
        alexander.shishkin@linux.intel.com, jolsa@redhat.com,
        namhyung@kernel.org, ndesaulniers@google.com, irogers@google.com,
        tmricht@linux.ibm.com, hushiyuan@huawei.com, hewenliang4@huawei.com
Subject: Re: [PATCH] perf report: Fix arm64 gap between kernel start and
 module end
Message-ID: <20200330131810.GC31702@kernel.org>
References: <33fd24c4-0d5a-9d93-9b62-dffa97c992ca@huawei.com>
 <20200330131129.GB31702@kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200330131129.GB31702@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Em Mon, Mar 30, 2020 at 10:11:29AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Mar 30, 2020 at 03:41:11PM +0800, Kemeng Shi escreveu:
> > diff --git a/tools/perf/arch/arm64/util/Build b/tools/perf/arch/arm64/util/Build
> > index 393b9895c..37cbfa5e9 100644
> > --- a/tools/perf/arch/arm64/util/Build
> > +++ b/tools/perf/arch/arm64/util/Build
> > @@ -2,6 +2,7 @@ libperf-y += header.o
> >  libperf-y += tsc.o
> >  libperf-y += sym-handling.o
> >  libperf-y += kvm-stat.o
> > +libperf-y += machine.o
> 
> You made the patch against an old perf codebase, right? This libperf-y
> above was changed to perf-y here:
> 
> commit 5ff328836dfde0cef9f28c8b8791a90a36d7a183
> Author: Jiri Olsa <jolsa@kernel.org>
> Date:   Wed Feb 13 13:32:39 2019 +0100
> 
>     perf tools: Rename build libperf to perf
> 
> ----
> 
> I'm fixing this up, please check my perf/core branch later to see that
> all is working as intended.
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core

Here it is:


From 829b915d7d7eeafbe4af76dce19ccbdc743a43c8 Mon Sep 17 00:00:00 2001
From: Kemeng Shi <shikemeng@huawei.com>
Date: Mon, 30 Mar 2020 15:41:11 +0800
Subject: [PATCH 1/1] perf symbols: Fix arm64 gap between kernel start and
 module end

During execution of command 'perf report' in my arm64 virtual machine,
this error message is showed:

failed to process sample

__symbol__inc_addr_samples(860): ENOMEM! sym->name=__this_module,
    start=0x1477100, addr=0x147dbd8, end=0x80002000, func: 0

The error is caused with path:
cmd_report
 __cmd_report
  perf_session__process_events
   __perf_session__process_events
    ordered_events__flush
     __ordered_events__flush
      oe->deliver (ordered_events__deliver_event)
       perf_session__deliver_event
        machines__deliver_event
         perf_evlist__deliver_sample
          tool->sample (process_sample_event)
           hist_entry_iter__add
            iter->add_entry_cb(hist_iter__report_callback)
             hist_entry__inc_addr_samples
              symbol__inc_addr_samples
               __symbol__inc_addr_samples
                h = annotated_source__histogram(src, evidx) (NULL)

annotated_source__histogram failed is caused with path:
...
 hist_entry__inc_addr_samples
  symbol__inc_addr_samples
   symbol__hists
    annotated_source__alloc_histograms
     src->histograms = calloc(nr_hists, sizeof_sym_hist) (failed)

Calloc failed as the symbol__size(sym) is too huge. As show in error
message: start=0x1477100, end=0x80002000, size of symbol is about 2G.

This is the same problem as 'perf annotate: Fix s390 gap between kernel
end and module start (b9c0a64901d5bd)'. Perf gets symbol information from
/proc/kallsyms in __dso__load_kallsyms. A part of symbol in /proc/kallsyms
from my virtual machine is as follows:
 #cat /proc/kallsyms | sort
 ...
 ffff000001475080 d rpfilter_mt_reg      [ip6t_rpfilter]
 ffff000001475100 d $d   [ip6t_rpfilter]
 ffff000001475100 d __this_module        [ip6t_rpfilter]
 ffff000080080000 t _head
 ffff000080080000 T _text
 ffff000080080040 t pe_header
 ...

Take line 'ffff000001475100 d __this_module [ip6t_rpfilter]' as example.
The start and end of symbol are both set to ffff000001475100 in
dso__load_all_kallsyms. Then symbols__fixup_end will set the end of symbol
to next big address to ffff000001475100 in /proc/kallsyms, ffff000080080000
in this example. Then sizeof of symbol will be about 2G and cause the
problem.

The start of module in my machine is
 ffff000000a62000 t $x   [dm_mod]

The start of kernel in my machine is
 ffff000080080000 t _head

There is a big gap between end of module and begin of kernel if a samll
amount of memory is used by module. And the last symbol in module will
have a large address range as caotaining the big gap.

Give that the module and kernel text segment sequence may change in
the future, fix this by limiting range of last symbol in module and kernel
to 4K in arch arm64.

Signed-off-by: Kemeng Shi <shikemeng@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Hu Shiyuan <hushiyuan@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: hewenliang4@huawei.com
Link: http://lore.kernel.org/lkml/33fd24c4-0d5a-9d93-9b62-dffa97c992ca@huawei.com
[ refreshed the patch on current codebase ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/arch/arm64/util/Build     |  1 +
 tools/perf/arch/arm64/util/machine.c | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 tools/perf/arch/arm64/util/machine.c

diff --git a/tools/perf/arch/arm64/util/Build b/tools/perf/arch/arm64/util/Build
index 789956f76d85..5c13438c7bd4 100644
--- a/tools/perf/arch/arm64/util/Build
+++ b/tools/perf/arch/arm64/util/Build
@@ -1,4 +1,5 @@
 perf-y += header.o
+perf-y += machine.o
 perf-y += perf_regs.o
 perf-$(CONFIG_DWARF)     += dwarf-regs.o
 perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
diff --git a/tools/perf/arch/arm64/util/machine.c b/tools/perf/arch/arm64/util/machine.c
new file mode 100644
index 000000000000..94745131e89a
--- /dev/null
+++ b/tools/perf/arch/arm64/util/machine.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <stdio.h>
+#include "debug.h"
+#include "symbol.h"
+
+/* On arm64, kernel text segment start at high memory address,
+ * for example 0xffff 0000 8xxx xxxx. Modules start at a low memory
+ * address, like 0xffff 0000 00ax xxxx. When only samll amount of
+ * memory is used by modules, gap between end of module's text segment
+ * and start of kernel text segment may be reach 2G.
+ * Therefore do not fill this gap and do not assign it to the kernel dso map.
+ */
+
+#define SYMBOL_LIMIT (1 << 12) /* 4K */
+
+void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
+{
+	if ((strchr(p->name, '[') && strchr(c->name, '[') == NULL) ||
+			(strchr(p->name, '[') == NULL && strchr(c->name, '[')))
+		/* Limit range of last symbol in module and kernel */
+		p->end += SYMBOL_LIMIT;
+	else
+		p->end = c->start;
+	pr_debug4("%s sym:%s end:%#lx\n", __func__, p->name, p->end);
+}
-- 
2.25.1