linux-kernel - Re: compaction tracepoint broken with CONFIG

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Date:	Mon, 19 Jan 2015 15:38:34 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Michal Hocko <mhocko@...e.cz>, akpm@...ux-foundation.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-next@...r.kernel.org, sfr@...b.auug.org.au
Subject: Re: compaction tracepoint broken with CONFIG_COMPACTION enabled

On 01/19/2015 01:42 PM, Michal Hocko wrote:
> Hi,
> compaction trace points seem to be broken without CONFIG_COMPACTION
> enabled after
> mm-compaction-more-trace-to-understand-when-why-compaction-start-finish.patch.
> 
> My config is
> # CONFIG_COMPACTION is not set
> CONFIG_CMA=y

Joonsoo posted a V4 that should be fixed at least according to description -
unfortunately it wasn't just fixes on top of what's in mmotm, though.

> which might be a bit unusual but I am getting
>   CC      mm/compaction.o
> In file included from include/trace/define_trace.h:90:0,
>                  from include/trace/events/compaction.h:298,
>                  from mm/compaction.c:49:
> include/trace/events/compaction.h: In function ‘ftrace_raw_output_mm_compaction_end’:
> include/trace/events/compaction.h:164:3: error: ‘compaction_status_string’ undeclared (first use in this function)
>    compaction_status_string[__entry->status])
>    ^
> [...]
> include/trace/events/compaction.h: In function ‘ftrace_raw_output_mm_compaction_suitable_template’:
> include/trace/events/compaction.h:220:3: error: ‘compaction_status_string’ undeclared (first use in this function)
>    compaction_status_string[__entry->ret])
> [...]
> scripts/Makefile.build:257: recipe for target 'mm/compaction.o' failed
> make[1]: *** [mm/compaction.o] Error 1
> Makefile:1528: recipe for target 'mm/compaction.o' failed
> make: *** [mm/compaction.o] Error 2
> 
> Moving compaction_status_string outside of CONFIG_COMPACTION doesn't
> help much because of other failures:
> include/trace/events/compaction.h:261:30: error: ‘struct zone’ has no member named ‘compact_defer_shift’
>    __entry->defer_shift = zone->compact_defer_shift;
> 
> So I guess the tracepoint need a better fix.
> 

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