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SubjectRe: [PATCH v5 11/16] perf report: properly handle branch count in match_chain
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On Freitag, 13. Oktober 2017 16:08:34 CEST Arnaldo Carvalho de Melo wrote:
> Em Fri, Oct 13, 2017 at 10:39:03AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Oct 09, 2017 at 10:33:05PM +0200, Milian Wolff escreveu:
> > > Some of the code paths I introduced before returned too early
> > > without running the code to handle a node's branch count.
> > > By refactoring match_chain to only have one exit point, this
> > > can be remedied.
> >
> > Fixing up this one now.
>
> Millian, this is all fresher in your mind, can you please take a look at
> my perf/core branch and check if the change i made to ]PATCH v5 09/16]
> "perf report: compare symbol name for inlined frames when matching" is
> ok wrt Ravi's fix and then, please, rebase v5 on top of what is there?

Regarding the 09/16 patch, I think your change is fine. With your rebase
request, do you mean I should rebase the rest of v5 (starting from 11/16, you
seem to have applied 10/16 already) and resent that as v6? I can do that, when
I get the time.

> Ravi, please take a look at this as well, to see if with these changes
> your fix remains valid, ok?
>
> Thanks,

Thanks for the review and rebase.

> > > Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> > > Cc: David Ahern <dsahern@gmail.com>
> > > Cc: Namhyung Kim <namhyung@kernel.org>
> > > Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
> > > Cc: Yao Jin <yao.jin@linux.intel.com>
> > > Signed-off-by: Milian Wolff <milian.wolff@kdab.com>
> > > ---
> > >
> > > tools/perf/util/callchain.c | 117
> > > +++++++++++++++++++++++--------------------- 1 file changed, 60
> > > insertions(+), 57 deletions(-)
> > >
> > > diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> > > index 3f1431bf71bd..782de047c902 100644
> > > --- a/tools/perf/util/callchain.c
> > > +++ b/tools/perf/util/callchain.c
> > > @@ -666,78 +666,81 @@ static enum match_result match_chain_strings(const
> > > char *left,> >
> > > return ret;
> > >
> > > }
> > >
> > > +static enum match_result match_address(u64 left, u64 right)
> > > +{
> > > + if (left == right)
> > > + return MATCH_EQ;
> > > + else if (left < right)
> > > + return MATCH_LT;
> > > + else
> > > + return MATCH_GT;
> > > +}
> > > +
> > >
> > > static enum match_result match_chain(struct callchain_cursor_node
> > > *node,
> > >
> > > struct callchain_list *cnode)
> > >
> > > {
> > >
> > > - struct symbol *sym = node->sym;
> > > - enum match_result match;
> > > - u64 left, right;
> > > + enum match_result match = MATCH_ERROR;
> > >
> > > - if (callchain_param.key == CCKEY_SRCLINE) {
> > > + switch (callchain_param.key) {
> > >
> > > + case CCKEY_SRCLINE:
> > > match = match_chain_strings(cnode->srcline, node->srcline);
> > >
> > > -
> > > - /* if no srcline is available, fallback to symbol name */
> > > - if (match == MATCH_ERROR && cnode->ms.sym && node->sym)
> > > - match = match_chain_strings(cnode->ms.sym->name,
> > > - node->sym->name);
> > > -
> > >
> > > if (match != MATCH_ERROR)
> > >
> > > - return match;
> > > -
> > > - /* otherwise fall-back to IP-based comparison below */
> > > - }
> > > -
> > > - if (cnode->ms.sym && sym && callchain_param.key == CCKEY_FUNCTION) {
> > > - /* compare inlined frames based on their symbol name because
> > > - * different inlined frames will have the same symbol start
> > > - */
> > > - if (cnode->ms.sym->inlined || node->sym->inlined)
> > > - return match_chain_strings(cnode->ms.sym->name,
> > > - node->sym->name);
> > > -
> > > - left = cnode->ms.sym->start;
> > > - right = sym->start;
> > > - } else {
> > > - left = cnode->ip;
> > > - right = node->ip;
> > > + break;
> > > + __fallthrough;
> > > + case CCKEY_FUNCTION:
> > > + if (node->sym && cnode->ms.sym) {
> > > + /* compare inlined frames based on their symbol name
> > > + * because different inlined frames will have the same
> > > + * symbol start. otherwise do a faster comparison based
> > > + * on the symbol start address
> > > + */
> > > + if (cnode->ms.sym->inlined || node->sym->inlined)
> > > + match = match_chain_strings(cnode->ms.sym->name,
> > > + node->sym->name);
> > > + else
> > > + match = match_address(cnode->ms.sym->start,
> > > + node->sym->start);
> > > + if (match != MATCH_ERROR)
> > > + break;
> > > + }
> > > + __fallthrough;
> > > + case CCKEY_ADDRESS:
> > > + default:
> > > + match = match_address(cnode->ip, node->ip);
> > > + break;
> > >
> > > }
> > >
> > > - if (left == right) {
> > > - if (node->branch) {
> > > - cnode->branch_count++;
> > > + if (match == MATCH_EQ && node->branch) {
> > > + cnode->branch_count++;
> > >
> > > - if (node->branch_from) {
> > > - /*
> > > - * It's "to" of a branch
> > > - */
> > > - cnode->brtype_stat.branch_to = true;
> > > + if (node->branch_from) {
> > > + /*
> > > + * It's "to" of a branch
> > > + */
> > > + cnode->brtype_stat.branch_to = true;
> > >
> > > - if (node->branch_flags.predicted)
> > > - cnode->predicted_count++;
> > > + if (node->branch_flags.predicted)
> > > + cnode->predicted_count++;
> > >
> > > - if (node->branch_flags.abort)
> > > - cnode->abort_count++;
> > > + if (node->branch_flags.abort)
> > > + cnode->abort_count++;
> > >
> > > - branch_type_count(&cnode->brtype_stat,
> > > - &node->branch_flags,
> > > - node->branch_from,
> > > - node->ip);
> > > - } else {
> > > - /*
> > > - * It's "from" of a branch
> > > - */
> > > - cnode->brtype_stat.branch_to = false;
> > > - cnode->cycles_count +=
> > > - node->branch_flags.cycles;
> > > - cnode->iter_count += node->nr_loop_iter;
> > > - cnode->iter_cycles += node->iter_cycles;
> > > - }
> > > + branch_type_count(&cnode->brtype_stat,
> > > + &node->branch_flags,
> > > + node->branch_from,
> > > + node->ip);
> > > + } else {
> > > + /*
> > > + * It's "from" of a branch
> > > + */
> > > + cnode->brtype_stat.branch_to = false;
> > > + cnode->cycles_count += node->branch_flags.cycles;
> > > + cnode->iter_count += node->nr_loop_iter;
> > > + cnode->iter_cycles += node->iter_cycles;
> > >
> > > }
> > >
> > > -
> > > - return MATCH_EQ;
> > >
> > > }
> > >
> > > - return left > right ? MATCH_GT : MATCH_LT;
> > > + return match;
> > >
> > > }
> > >
> > > /*


--
Milian Wolff | milian.wolff@kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts


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