Re: [PATCH V2 25/37] perf script: Add synthesized Intel PT power and ptwrite events

[Arnaldo Carvalho de Melo]

Em Fri, May 26, 2017 at 11:17:26AM +0300, Adrian Hunter escreveu:
> Add definitions for synthesized Intel PT events for power and ptwrite.
 
> +++ b/tools/perf/util/event.h
> +/*
> + * Raw data formats for synthesized events. Note that raw data plus the raw data
> + * size (4 bytes) must align to 8-bytes.
> + */
> +
> +struct perf_synth_intel_ptwrite {
> +	union {
> +		struct {
> +			u32	ip		:  1,
> +				reserved	: 31;
> +		};
> +		u32	flags;
> +	};
> +	u64	payload;
> +} __packed;


some versions of clang and gcc dislike this __packed here:

In file included from builtin-script.c:5:
In file included from /git/linux/tools/perf/util/debug.h:8:
/git/linux/tools/perf/util/event.h:274:2: error: packed attribute is unnecessary for (null) [-Werror,-Wpacked]
        union {
        ^
/git/linux/tools/perf/util/event.h:285:6: error: packed attribute is unnecessary for 'reserved' [-Werror,-Wpacked]
        u32 reserved;
            ^
/git/linux/tools/perf/util/event.h:298:6: error: packed attribute is unnecessary for 'reserved' [-Werror,-Wpacked]
        u32 reserved;
            ^
/git/linux/tools/perf/util/event.h:322:6: error: packed attribute is unnecessary for 'reserved' [-Werror,-Wpacked]
        u32 reserved;
            ^
4 errors generated.
mv: can't rename '/tmp/build/perf/.builtin-script.o.tmp': No such file or directory

/git/linux/tools/build/Makefile.build:101: recipe for target '/tmp/build/perf/builtin-script.o' failed

Failing in various distros:

[root@jouet ~]# waitp 3940 ; time dm
   1 92.3684147260 alpine:3.4: FAIL
   2 95.9136365930 alpine:3.5: FAIL
   3 104.8328303770 alpine:3.6: FAIL
   4 121.6584964930 alpine:edge: FAIL
   5 37.2536373490 android-ndk:r12b-arm: Ok
   6 83.9077612370 archlinux:latest: Ok
   7 14.7094639200 centos:5: FAIL
   8 16.6371634320 centos:6: FAIL

Investigating...

> +
> +struct perf_synth_intel_mwait {
> +	u32 reserved;
> +	union {
> +		struct {
> +			u64	hints		:  8,
> +				reserved1	: 24,
> +				extensions	:  2,
> +				reserved2	: 30;
> +		};
> +		u64	payload;
> +	};
> +} __packed;
> +
> +struct perf_synth_intel_pwre {
> +	u32 reserved;
> +	union {
> +		struct {
> +			u64	reserved1	:  7,
> +				hw		:  1,
> +				subcstate	:  4,
> +				cstate		:  4,
> +				reserved2	: 48;
> +		};
> +		u64	payload;
> +	};
> +} __packed;
> +
> +struct perf_synth_intel_exstop {
> +	union {
> +		struct {
> +			u32	ip		:  1,
> +				reserved	: 31;
> +		};
> +		u32	flags;
> +	};
> +};
> +
> +struct perf_synth_intel_pwrx {
> +	u32 reserved;
> +	union {
> +		struct {
> +			u64	deepest_cstate	:  4,
> +				last_cstate	:  4,
> +				wake_reason	:  4,
> +				reserved1	: 52;
> +		};
> +		u64	payload;
> +	};
> +} __packed;
> +
> +struct perf_synth_intel_cbr {
> +	union {
> +		struct {
> +			u32	cbr		:  8,
> +				reserved1	:  8,
> +				max_nonturbo	:  8,
> +				reserved2	:  8;
> +		};
> +		u32	flags;
> +	};
> +	u32 freq;
> +	u32 reserved3;
> +};
> +
>  /*
>   * The kernel collects the number of events it couldn't send in a stretch and
>   * when possible sends this number in a PERF_RECORD_LOST event. The number of
> -- 
> 1.9.1