linux-kernel - Re: [RFC PATCH 3/3] mm: compaction: Fix the migration stats in trace_mm_compaction

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Date:   Thu, 4 Nov 2021 17:18:52 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     akpm@...ux-foundation.org, mingo@...hat.com, ziy@...dia.com,
        shy828301@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] mm: compaction: Fix the migration stats in
 trace_mm_compaction_migratepages()



On 2021/11/3 21:42, Steven Rostedt wrote:
> On Wed,  3 Nov 2021 18:51:16 +0800
> Baolin Wang <baolin.wang@...ux.alibaba.com> wrote:
> 
>> @@ -2398,10 +2399,10 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order,
>>   
>>   		err = migrate_pages(&cc->migratepages, compaction_alloc,
>>   				compaction_free, (unsigned long)cc, cc->mode,
>> -				MR_COMPACTION, NULL);
>> +				MR_COMPACTION, &nr_succeeded);
>>   
>> -		trace_mm_compaction_migratepages(cc->nr_migratepages, err,
>> -							&cc->migratepages);
>> +		trace_mm_compaction_migratepages(cc->nr_migratepages,
>> +						 nr_succeeded);
> 
> Also, I'm surprised you don't just pass in 'cc' and do the dereferencing in
> the trace event macro. Accessing the pointers from the trace event and not
> dereferencing them to the tracepoint function moves the changes out of line
> here and helps with I$.
> 
> You could improve some of the other tracepoints that dereference 'cc' as
> well in that file.

Sure. Will do in a separate patch.

> 
> But as for this change, I'm good with it.
> 
> For the tracing aspect:
> 
> Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 

Thanks.