linux-kernel - Re: [PATCH] perf tools: set kernel end address properly

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Date:   Mon, 16 Apr 2018 12:24:07 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, <kernel-team@....com>
Subject: Re: [PATCH] perf tools: set kernel end address properly

On Mon, 16 Apr 2018 13:58:00 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Mon, Apr 16, 2018 at 11:07:30AM -0500, Kim Phillips escreveu:
> > On Mon, 16 Apr 2018 10:51:25 -0300
> > Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > 
> > > Em Mon, Apr 16, 2018 at 11:23:45AM +0200, Jiri Olsa escreveu:
> > > > On Mon, Apr 16, 2018 at 01:22:40PM +0900, Namhyung Kim wrote:
> > > > > The map_groups__fixup_end() was called to set end addresses of kernel
> > > > > map and module maps.  But now machine__create_modules() is set the end
> > > > > address of modules properly so the only remaining piece is the kernel
> > > > > map.  We can set it with adjacent module's address directly instead of
> > > > > calling the map_groups__fixup_end().  If there's no module after the
> > > > > kernel map, the end address will be ~0ULL.
> > > 
> > > I wonder if it wouldn't be better to have it as last symbol + PAGE_SIZE
> > > or something like that...
> > > 
> > > But, anyway, Kim, does this fix things for you? Can I have your
> > > Tested-by?
> > 
> > No, perf test 1 still fails:
> > 
> > vmlinux symtab matches kallsyms: FAILED!
> 
> Ok, -vv please

a perf/urgent from last week (commit 918965d4897) + this patch:

$ sudo ./perf test -vv 1 |& head 
 1: vmlinux symtab matches kallsyms                       :
--- start ---
test child forked, pid 6194
Looking at the vmlinux_path (8 entries long)
Using /lib/modules/4.16.0+/build/vmlinux for symbols
ERR : 0xffff200008081000: do_undefinstr not on kallsyms
ERR : 0xffff2000080810b8: do_sysinstr not on kallsyms
ERR : 0xffff200008081258: do_debug_exception not on kallsyms
ERR : 0xffff200008081648: do_mem_abort not on kallsyms
ERR : 0xffff2000080818b8: do_el0_irq_bp_hardening not on kallsyms
$ sudo ./perf test -vv 1 |& tail
ERR : 0xffff20000a1d37c8: tramp_exit_native not on kallsyms
ERR : 0xffff20000a1d37e8: tramp_exit_compat not on kallsyms
ERR : 0xffff20000a1d4000: __entry_tramp_text_end not on kallsyms
WARN: Maps only in vmlinux:
 ffff200008080000-ffff200008081000 10000 [kernel].head.text
 ffff20000aec0000-ffff20000aff7548 2e50000 [kernel].init.text
 ffff20000aff7548-ffff20000b0126d4 2f87548 [kernel].exit.text
test child finished with -1
---- end ----
vmlinux symtab matches kallsyms: FAILED!
$ 

Kim