Messages in this thread Patch in this message | | | Date | Mon, 13 Mar 2023 14:58:22 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v4 04/16] perf kvm: Use subtraction for comparison metrics |
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Em Mon, Mar 13, 2023 at 07:40:06PM +0800, Leo Yan escreveu: > Currently the metrics comparison uses greater operator (>), it returns > the boolean value (0 or 1). > > This patch changes to use subtraction as comparison result, which can > be used by histograms sorting. Since the subtraction result is u64 > type, we change the function return type from int to int64_t to avoid > overflow.
Not building at his point in the series:
LD /tmp/build/perf-tools-next/util/perf-in.o builtin-kvm.c:80:18: error: initialization of ‘int (*)(struct kvm_event *, struct kvm_event *, int)’ from incompatible pointer type ‘int64_t (*)(struct kvm_event *, struct kvm_event *, int)’ {aka ‘long int (*)(struct kvm_event *, struct kvm_event *, int)’} [-Werror=incompatible-pointer-types] 80 | { #name, cmp_event_ ## compare_key } | ^~~~~~~~~~ builtin-kvm.c:83:9: note: in expansion of macro ‘DEF_SORT_NAME_KEY’ 83 | DEF_SORT_NAME_KEY(sample, count), | ^~~~~~~~~~~~~~~~~ builtin-kvm.c:80:18: note: (near initialization for ‘keys[0].key’) 80 | { #name, cmp_event_ ## compare_key } | ^~~~~~~~~~ builtin-kvm.c:83:9: note: in expansion of macro ‘DEF_SORT_NAME_KEY’ 83 | DEF_SORT_NAME_KEY(sample, count), | ^~~~~~~~~~~~~~~~~ builtin-kvm.c:80:18: error: initialization of ‘int (*)(struct kvm_event *, struct kvm_event *, int)’ from incompatible pointer type ‘int64_t (*)(struct kvm_event *, struct kvm_event *, int)’ {aka ‘long int (*)(struct kvm_event *, struct kvm_event *, int)’} [-Werror=incompatible-pointer-types] 80 | { #name, cmp_event_ ## compare_key } | ^~~~~~~~~~ builtin-kvm.c:84:9: note: in expansion of macro ‘DEF_SORT_NAME_KEY’ 84 | DEF_SORT_NAME_KEY(time, mean), | ^~~~~~~~~~~~~~~~~ builtin-kvm.c:80:18: note: (near initialization for ‘keys[1].key’) 80 | { #name, cmp_event_ ## compare_key } | ^~~~~~~~~~ builtin-kvm.c:84:9: note: in expansion of macro ‘DEF_SORT_NAME_KEY’ 84 | DEF_SORT_NAME_KEY(time, mean), | ^~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors make[3]: *** [/var/home/acme/git/perf-tools-next/tools/build/Makefile.build:97: /tmp/build/perf-tools-next/builtin-kvm.o] Error 1 make[3]: *** Waiting for unfinished jobs.... make[2]: *** [Makefile.perf:673: /tmp/build/perf-tools-next/perf-in.o] Error 2 make[2]: *** Waiting for unfinished jobs.... CC /tmp/build/perf-tools-next/pmu-events/pmu-events.o LD /tmp/build/perf-tools-next/pmu-events/pmu-events-in.o make[1]: *** [Makefile.perf:236: sub-make] Error 2 make: *** [Makefile:113: install-bin] Error 2 make: Leaving directory '/var/home/acme/git/perf-tools-next/tools/perf'
Performance counter stats for 'make -k BUILD_BPF_SKEL=1 CORESIGHT=1 O=/tmp/build/perf-tools-next -C tools/perf install-bin':
46519453561 cycles:u 73484239007 instructions:u # 1.58 insn per cycle
10.053592077 seconds time elapsed
10.925077000 seconds user 8.045887000 seconds sys
⬢[acme@toolbox perf-tools-next]$ git log --oneline -4 40843f667620dcf3 (HEAD) perf kvm: Use subtraction for comparison metrics c6a5a089864171f2 perf kvm: Move up metrics helpers 1d75bc17ffc933aa perf kvm: Add pointer to 'perf_kvm_stat' in kvm event 4568393639938020 perf kvm: Refactor overall statistics ⬢[acme@toolbox perf-tools-next]$
⬢[acme@toolbox perf-tools-next]$ gcc --version gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4) > Signed-off-by: Leo Yan <leo.yan@linaro.org> > --- > tools/perf/builtin-kvm.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c > index 62c097a37da9..4e9519390da6 100644 > --- a/tools/perf/builtin-kvm.c > +++ b/tools/perf/builtin-kvm.c > @@ -63,10 +63,10 @@ static u64 get_event_ ##func(struct kvm_event *event, int vcpu) \ > > #define COMPARE_EVENT_KEY(func, field) \ > GET_EVENT_KEY(func, field) \ > -static int cmp_event_ ## func(struct kvm_event *one, \ > +static int64_t cmp_event_ ## func(struct kvm_event *one, \ > struct kvm_event *two, int vcpu) \ > { \ > - return get_event_ ##func(one, vcpu) > \ > + return get_event_ ##func(one, vcpu) - \ > get_event_ ##func(two, vcpu); \ > } > > @@ -523,7 +523,7 @@ static void insert_to_result(struct rb_root *result, struct kvm_event *event, > p = container_of(*rb, struct kvm_event, rb); > parent = *rb; > > - if (bigger(event, p, vcpu)) > + if (bigger(event, p, vcpu) > 0) > rb = &(*rb)->rb_left; > else > rb = &(*rb)->rb_right; > -- > 2.34.1 >
--
- Arnaldo
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