Re: [PATCH] Fix s390x compile error on F32 utils/stat-display.c
On 8/24/20 10:22 PM, Jiri Olsa wrote: > On Wed, Aug 12, 2020 at 08:27:08AM -0300, Arnaldo Carvalho de Melo wrote: >> Em Wed, Jul 22, 2020 at 11:20:53AM +0200, Thomas Richter escreveu: >>> Fix a compile error on F32 and gcc version 10.1 on s390 in file >>> utils/stat-display.c. The error does not show up with make DEBUG=y. >>> In fact the issue shows up when using both compiler options >>> -O6 and -D_FORTIFY_SOURCE=2 (which are omitted with DEBUG=Y). >>> >>> This is the offending call chain: >>> print_counter_aggr() >>> printout(config, -1, 0, ...) with 2nd parm id set to -1 >>> aggr_printout(config, x, id --> -1, ...) which leads to this code: >>> case AGGR_NONE: >>> if (evsel->percore && !config->percore_show_thread) { >>> >>> } else { >>> fprintf(config->output, "CPU%*d%s", >>> config->csv_output ? 0 : -7, >>> evsel__cpus(evsel)->map[id], >>> ^^ id is -1 >>> config->csv_sep); >>> } >>> >>> This is a compiler inlining issue which is detected on s390 but not on >>> other plattforms. >> >> What is the sequence of events that gets to this? I.e. is it valid to >> get a config->aggr_mode == AGGR_NONE, then have evsel not be percore and >> config->percore_show_thread to be false? >> >> I wonder if this won't be papering over some bug :-\ >> >> Jin? >> >> This is where this came from: >> commit 4fc4d8dfa056dfd48afe73b9ea3b7570ceb80b9c (tag: >> perf-core-for-mingo-5.2-20190517) >> Author: Jin Yao >> Date: Fri Apr 12 21:59:49 2019 +0800 >> >> perf stat: Support 'percore' event qualifier >> >> With this patch, we can use the 'percore' event qualifier in perf-stat. >> >> --- >> >> Also please add at least Jiri and Namhyung on the CC list, having the >> person that added that array usage also helps. >> >> [acme@quaco perf]$ scripts/get_maintainer.pl tools/perf | grep reviewer >> Mark Rutland (reviewer:PERFORMANCE EVENTS SUBSYSTEM) >> Alexander Shishkin >> (reviewer:PERFORMANCE EVENTS SUBSYSTEM) >> Jiri Olsa (reviewer:PERFORMANCE EVENTS SUBSYSTEM) >> Namhyung Kim (reviewer:PERFORMANCE EVENTS SUBSYSTEM) >> [acme@quaco perf]$ >> >> Thanks, >> >> - Arnaldo >> >>> Output before: >>> # make util/stat-display.o >>> . >>> >>> util/stat-display.c: In function ‘perf_evlist__print_counters’: >>> util/stat-display.c:121:4: error: array subscript -1 is below array >>> bounds of ‘int[]’ [-Werror=array-bounds] >>> 121 |fprintf(config->output, "CPU%*d%s", >>> |^~~ >>> 122 | config->csv_output ? 0 : -7, >>> | >>> 123 | evsel__cpus(evsel)->map[id], >>> | >>> 124 | config->csv_sep); >>> | >>> In file included from util/evsel.h:13, >>> from util/evlist.h:13, >>> from util/stat-display.c:9: >>> /root/linux/tools/lib/perf/include/internal/cpumap.h:10:7: >>> note: while referencing ‘map’ >>>10 | int map[]; >>> | ^~~ >>> cc1: all warnings being treated as errors >>> mv: cannot stat 'util/.stat-display.o.tmp': No such file or directory >>> make[3]: *** [/root/linux/tools/build/Makefile.build:97: >>> util/stat-display.o] >>> Error 1 >>> make[2]: *** [Makefile.perf:716: util/stat-display.o] Error 2 >>> make[1]: *** [Makefile.perf:231: sub-make] Error 2 >>> make: *** [Makefile:110: util/stat-display.o] Error 2 >>> [root@t35lp46 perf]# > > I tested on s390 with rhel8, but did not get this error, > f32's gcc must be smarter > i Jiri, that is correct. I have installed Fedora 32 on my LPAR and the gcc version is: [root@t35lp46 ~]# gcc --version gcc (GCC) 10.1.1 20200507 (Red Hat 10.1.1-1) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. [root@t35lp46 ~]# cat /etc/redhat-release Fedora release 32 (Thirty Two) [root@t35lp46 ~]# Same commands on a RHEL 8.2 installation reveal [root@m35lp76 ~]# gcc --version gcc (GCC) 8.3.1 20191121 (Red Hat 8.3.1-5) Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. [root@m35lp76 ~]# cat /etc/redhat-release Red Hat Enterprise Linux release 8.2 Beta (Ootpa) [root@m35lp76 ~]# So there are 2 major revisions difference between a F32 and a RHEL8 gcc compiler installation. >>> >>> Output after: >>> # make util/stat-display.o >>> . >>> CC util/stat-display.o >>> [root@t35lp46 perf]# >>> >>> Signed-off-by: Thomas Richter >>> --- >>>
Re: [PATCH] Fix s390x compile error on F32 utils/stat-display.c
On Wed, Aug 12, 2020 at 08:27:08AM -0300, Arnaldo Carvalho de Melo wrote: > Em Wed, Jul 22, 2020 at 11:20:53AM +0200, Thomas Richter escreveu: > > Fix a compile error on F32 and gcc version 10.1 on s390 in file > > utils/stat-display.c. The error does not show up with make DEBUG=y. > > In fact the issue shows up when using both compiler options > > -O6 and -D_FORTIFY_SOURCE=2 (which are omitted with DEBUG=Y). > > > > This is the offending call chain: > > print_counter_aggr() > > printout(config, -1, 0, ...) with 2nd parm id set to -1 > > aggr_printout(config, x, id --> -1, ...) which leads to this code: > > case AGGR_NONE: > > if (evsel->percore && !config->percore_show_thread) { > > > > } else { > > fprintf(config->output, "CPU%*d%s", > > config->csv_output ? 0 : -7, > > evsel__cpus(evsel)->map[id], > > ^^ id is -1 > > config->csv_sep); > > } > > > > This is a compiler inlining issue which is detected on s390 but not on > > other plattforms. > > What is the sequence of events that gets to this? I.e. is it valid to > get a config->aggr_mode == AGGR_NONE, then have evsel not be percore and > config->percore_show_thread to be false? > > I wonder if this won't be papering over some bug :-\ > > Jin? > > This is where this came from: > commit 4fc4d8dfa056dfd48afe73b9ea3b7570ceb80b9c (tag: > perf-core-for-mingo-5.2-20190517) > Author: Jin Yao > Date: Fri Apr 12 21:59:49 2019 +0800 > > perf stat: Support 'percore' event qualifier > > With this patch, we can use the 'percore' event qualifier in perf-stat. > > --- > > Also please add at least Jiri and Namhyung on the CC list, having the > person that added that array usage also helps. > > [acme@quaco perf]$ scripts/get_maintainer.pl tools/perf | grep reviewer > Mark Rutland (reviewer:PERFORMANCE EVENTS SUBSYSTEM) > Alexander Shishkin (reviewer:PERFORMANCE > EVENTS SUBSYSTEM) > Jiri Olsa (reviewer:PERFORMANCE EVENTS SUBSYSTEM) > Namhyung Kim (reviewer:PERFORMANCE EVENTS SUBSYSTEM) > [acme@quaco perf]$ > > Thanks, > > - Arnaldo > > > Output before: > > # make util/stat-display.o > > . > > > > util/stat-display.c: In function ‘perf_evlist__print_counters’: > > util/stat-display.c:121:4: error: array subscript -1 is below array > > bounds of ‘int[]’ [-Werror=array-bounds] > > 121 |fprintf(config->output, "CPU%*d%s", > > |^~~ > > 122 | config->csv_output ? 0 : -7, > > | > > 123 | evsel__cpus(evsel)->map[id], > > | > > 124 | config->csv_sep); > > | > > In file included from util/evsel.h:13, > > from util/evlist.h:13, > > from util/stat-display.c:9: > > /root/linux/tools/lib/perf/include/internal/cpumap.h:10:7: > > note: while referencing ‘map’ > >10 | int map[]; > > | ^~~ > > cc1: all warnings being treated as errors > > mv: cannot stat 'util/.stat-display.o.tmp': No such file or directory > > make[3]: *** [/root/linux/tools/build/Makefile.build:97: > > util/stat-display.o] > > Error 1 > > make[2]: *** [Makefile.perf:716: util/stat-display.o] Error 2 > > make[1]: *** [Makefile.perf:231: sub-make] Error 2 > > make: *** [Makefile:110: util/stat-display.o] Error 2 > > [root@t35lp46 perf]# I tested on s390 with rhel8, but did not get this error, f32's gcc must be smarter > > > > Output after: > > # make util/stat-display.o > > . > > CC util/stat-display.o > > [root@t35lp46 perf]# > > > > Signed-off-by: Thomas Richter > > --- > > tools/perf/util/stat-display.c | 9 + > > 1 file changed, 5 insertions(+), 4 deletions(-) > > > > diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c > > index 57d0706e1330..e49e544188e4 100644 > > --- a/tools/perf/util/stat-display.c > > +++ b/tools/perf/util/stat-display.c > > @@ -118,10 +118,11 @@ static void aggr_printout(struct perf_stat_config > > *config, > > config->csv_output ? 0 : -3, > > cpu_map__id_to_cpu(id), config->csv_sep); > > } else { > > - fprintf(config->output, "CPU%*d%s", > > - config->csv_output ? 0 : -7, > > - evsel__cpus(evsel)->map[id], > > - config->csv_sep); > > + if (id > -1) > > + fprintf(config->output, "CPU%*d%s", > > + config->csv_output ? 0 : -7, > > + evsel__cpus(evsel)->map[id], > > +
Re: [PATCH] Fix s390x compile error on F32 utils/stat-display.c
Hi Arnaldo, Jin, Jiri any update on this issue? Thanks. On 8/12/20 1:27 PM, Arnaldo Carvalho de Melo wrote: > Em Wed, Jul 22, 2020 at 11:20:53AM +0200, Thomas Richter escreveu: >> Fix a compile error on F32 and gcc version 10.1 on s390 in file >> utils/stat-display.c. The error does not show up with make DEBUG=y. >> In fact the issue shows up when using both compiler options >> -O6 and -D_FORTIFY_SOURCE=2 (which are omitted with DEBUG=Y). >> >> This is the offending call chain: >> print_counter_aggr() >> printout(config, -1, 0, ...) with 2nd parm id set to -1 >> aggr_printout(config, x, id --> -1, ...) which leads to this code: >> case AGGR_NONE: >> if (evsel->percore && !config->percore_show_thread) { >> >> } else { >> fprintf(config->output, "CPU%*d%s", >> config->csv_output ? 0 : -7, >> evsel__cpus(evsel)->map[id], >> ^^ id is -1 >> config->csv_sep); >> } >> >> This is a compiler inlining issue which is detected on s390 but not on >> other plattforms. > > What is the sequence of events that gets to this? I.e. is it valid to > get a config->aggr_mode == AGGR_NONE, then have evsel not be percore and > config->percore_show_thread to be false? > > I wonder if this won't be papering over some bug :-\ > > Jin? > > This is where this came from: > commit 4fc4d8dfa056dfd48afe73b9ea3b7570ceb80b9c (tag: > perf-core-for-mingo-5.2-20190517) > Author: Jin Yao > Date: Fri Apr 12 21:59:49 2019 +0800 > > perf stat: Support 'percore' event qualifier > > With this patch, we can use the 'percore' event qualifier in perf-stat. > > --- > > Also please add at least Jiri and Namhyung on the CC list, having the > person that added that array usage also helps. > > [acme@quaco perf]$ scripts/get_maintainer.pl tools/perf | grep reviewer > Mark Rutland (reviewer:PERFORMANCE EVENTS SUBSYSTEM) > Alexander Shishkin (reviewer:PERFORMANCE > EVENTS SUBSYSTEM) > Jiri Olsa (reviewer:PERFORMANCE EVENTS SUBSYSTEM) > Namhyung Kim (reviewer:PERFORMANCE EVENTS SUBSYSTEM) > [acme@quaco perf]$ > > Thanks, > > - Arnaldo > >> Output before: >> # make util/stat-display.o >> . >> >> util/stat-display.c: In function ‘perf_evlist__print_counters’: >> util/stat-display.c:121:4: error: array subscript -1 is below array >> bounds of ‘int[]’ [-Werror=array-bounds] >> 121 |fprintf(config->output, "CPU%*d%s", >> |^~~ >> 122 | config->csv_output ? 0 : -7, >> | >> 123 | evsel__cpus(evsel)->map[id], >> | >> 124 | config->csv_sep); >> | >> In file included from util/evsel.h:13, >> from util/evlist.h:13, >> from util/stat-display.c:9: >> /root/linux/tools/lib/perf/include/internal/cpumap.h:10:7: >> note: while referencing ‘map’ >>10 | int map[]; >> | ^~~ >> cc1: all warnings being treated as errors >> mv: cannot stat 'util/.stat-display.o.tmp': No such file or directory >> make[3]: *** [/root/linux/tools/build/Makefile.build:97: >> util/stat-display.o] >> Error 1 >> make[2]: *** [Makefile.perf:716: util/stat-display.o] Error 2 >> make[1]: *** [Makefile.perf:231: sub-make] Error 2 >> make: *** [Makefile:110: util/stat-display.o] Error 2 >> [root@t35lp46 perf]# >> >> Output after: >> # make util/stat-display.o >> . >> CC util/stat-display.o >> [root@t35lp46 perf]# >> >> Signed-off-by: Thomas Richter >> --- >> tools/perf/util/stat-display.c | 9 + >> 1 file changed, 5 insertions(+), 4 deletions(-) >> >> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c >> index 57d0706e1330..e49e544188e4 100644 >> --- a/tools/perf/util/stat-display.c >> +++ b/tools/perf/util/stat-display.c >> @@ -118,10 +118,11 @@ static void aggr_printout(struct perf_stat_config >> *config, >> config->csv_output ? 0 : -3, >> cpu_map__id_to_cpu(id), config->csv_sep); >> } else { >> -fprintf(config->output, "CPU%*d%s", >> -config->csv_output ? 0 : -7, >> -evsel__cpus(evsel)->map[id], >> -config->csv_sep); >> +if (id > -1) >> +fprintf(config->output, "CPU%*d%s", >> +config->csv_output ? 0 : -7, >> +evsel__cpus(evsel)->map[id], >> +config->csv_sep); >> } >> break; >> case AGGR_THREAD: >> -- >> 2.26.2 >> > -- Thomas
Re: [PATCH] Fix s390x compile error on F32 utils/stat-display.c
Em Wed, Jul 22, 2020 at 11:20:53AM +0200, Thomas Richter escreveu: > Fix a compile error on F32 and gcc version 10.1 on s390 in file > utils/stat-display.c. The error does not show up with make DEBUG=y. > In fact the issue shows up when using both compiler options > -O6 and -D_FORTIFY_SOURCE=2 (which are omitted with DEBUG=Y). > > This is the offending call chain: > print_counter_aggr() > printout(config, -1, 0, ...) with 2nd parm id set to -1 > aggr_printout(config, x, id --> -1, ...) which leads to this code: > case AGGR_NONE: > if (evsel->percore && !config->percore_show_thread) { > > } else { > fprintf(config->output, "CPU%*d%s", > config->csv_output ? 0 : -7, > evsel__cpus(evsel)->map[id], > ^^ id is -1 > config->csv_sep); > } > > This is a compiler inlining issue which is detected on s390 but not on > other plattforms. What is the sequence of events that gets to this? I.e. is it valid to get a config->aggr_mode == AGGR_NONE, then have evsel not be percore and config->percore_show_thread to be false? I wonder if this won't be papering over some bug :-\ Jin? This is where this came from: commit 4fc4d8dfa056dfd48afe73b9ea3b7570ceb80b9c (tag: perf-core-for-mingo-5.2-20190517) Author: Jin Yao Date: Fri Apr 12 21:59:49 2019 +0800 perf stat: Support 'percore' event qualifier With this patch, we can use the 'percore' event qualifier in perf-stat. --- Also please add at least Jiri and Namhyung on the CC list, having the person that added that array usage also helps. [acme@quaco perf]$ scripts/get_maintainer.pl tools/perf | grep reviewer Mark Rutland (reviewer:PERFORMANCE EVENTS SUBSYSTEM) Alexander Shishkin (reviewer:PERFORMANCE EVENTS SUBSYSTEM) Jiri Olsa (reviewer:PERFORMANCE EVENTS SUBSYSTEM) Namhyung Kim (reviewer:PERFORMANCE EVENTS SUBSYSTEM) [acme@quaco perf]$ Thanks, - Arnaldo > Output before: > # make util/stat-display.o > . > > util/stat-display.c: In function ‘perf_evlist__print_counters’: > util/stat-display.c:121:4: error: array subscript -1 is below array > bounds of ‘int[]’ [-Werror=array-bounds] > 121 |fprintf(config->output, "CPU%*d%s", > |^~~ > 122 | config->csv_output ? 0 : -7, > | > 123 | evsel__cpus(evsel)->map[id], > | > 124 | config->csv_sep); > | > In file included from util/evsel.h:13, > from util/evlist.h:13, > from util/stat-display.c:9: > /root/linux/tools/lib/perf/include/internal/cpumap.h:10:7: > note: while referencing ‘map’ >10 | int map[]; > | ^~~ > cc1: all warnings being treated as errors > mv: cannot stat 'util/.stat-display.o.tmp': No such file or directory > make[3]: *** [/root/linux/tools/build/Makefile.build:97: > util/stat-display.o] > Error 1 > make[2]: *** [Makefile.perf:716: util/stat-display.o] Error 2 > make[1]: *** [Makefile.perf:231: sub-make] Error 2 > make: *** [Makefile:110: util/stat-display.o] Error 2 > [root@t35lp46 perf]# > > Output after: > # make util/stat-display.o > . > CC util/stat-display.o > [root@t35lp46 perf]# > > Signed-off-by: Thomas Richter > --- > tools/perf/util/stat-display.c | 9 + > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c > index 57d0706e1330..e49e544188e4 100644 > --- a/tools/perf/util/stat-display.c > +++ b/tools/perf/util/stat-display.c > @@ -118,10 +118,11 @@ static void aggr_printout(struct perf_stat_config > *config, > config->csv_output ? 0 : -3, > cpu_map__id_to_cpu(id), config->csv_sep); > } else { > - fprintf(config->output, "CPU%*d%s", > - config->csv_output ? 0 : -7, > - evsel__cpus(evsel)->map[id], > - config->csv_sep); > + if (id > -1) > + fprintf(config->output, "CPU%*d%s", > + config->csv_output ? 0 : -7, > + evsel__cpus(evsel)->map[id], > + config->csv_sep); > } > break; > case AGGR_THREAD: > -- > 2.26.2 > -- - Arnaldo