Messages in this thread | | | Date | Thu, 5 Oct 2017 13:13:55 +0900 | From | Namhyung Kim <> | Subject | Re: [PATCH] perf callchain: Compare dsos (as well) for CCKEY_FUNCTION |
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Hi,
On Thu, Oct 05, 2017 at 09:20:21AM +0530, Ravi Bangoria wrote: > Two functions from different binaries can have same start > address. Thus, comparing only start address in match_chain() > leads to inconsistent callchains. Fix this by adding a check > for dsos as well. > > Ex, https://www.spinics.net/lists/linux-perf-users/msg04067.html > > Reported-by: Alexander Pozdneev <pozdneyev@gmail.com> > Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> > --- > tools/perf/util/callchain.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c > index be09d77..6d7f645 100644 > --- a/tools/perf/util/callchain.c > +++ b/tools/perf/util/callchain.c > @@ -685,6 +685,9 @@ static enum match_result match_chain(struct callchain_cursor_node *node, > { > struct symbol *sym = node->sym; > u64 left, right; > + struct dso *left_dso = NULL; > + struct dso *right_dso = NULL; > + > > if (callchain_param.key == CCKEY_SRCLINE) { > enum match_result match = match_chain_srcline(node, cnode); > @@ -696,12 +699,16 @@ static enum match_result match_chain(struct callchain_cursor_node *node, > if (cnode->ms.sym && sym && callchain_param.key == CCKEY_FUNCTION) { > left = cnode->ms.sym->start; > right = sym->start; > + if (cnode->ms.map) > + left_dso = cnode->ms.map->dso; > + if (node->map) > + right_dso = node->map->dso;
AFAIK having a symbol guarantees having a map too. So it could simply be:
left_dso = cnode->ms.map->dso; right_dso = node->map->dso;
Thanks, Namhyung
> } else { > left = cnode->ip; > right = node->ip; > } > > - if (left == right) { > + if (left == right && left_dso == right_dso) { > if (node->branch) { > cnode->branch_count++; > > -- > 1.8.3.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
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