linux-kernel - Re: [RFC PATCH] mm: trace filemap add and del

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Date:	Wed, 21 Nov 2012 11:41:23 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mm: trace filemap add and del

Hugh Dickins <hughd@...gle.com> writes:

> On Thu, 8 Nov 2012, Robert Jarzmik wrote:
>> --- a/mm/filemap.c
>> +++ b/mm/filemap.c
>> @@ -467,6 +471,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
>>  		} else {
>>  			page->mapping = NULL;
>>  			/* Leave page->index set: truncation relies upon it */
>> +			trace_mm_filemap_add_to_page_cache(page);
>>  			spin_unlock_irq(&mapping->tree_lock);
>>  			mem_cgroup_uncharge_cache_page(page);
>>  			page_cache_release(page);
>
> I doubt if you really want your tracepoint sited just in this error path.

Urghh ... a git rebase mystified me.
In my original code, that tracepoint was 5 lines above, before the previous
spin_unlock_irq(), in the if branch, not the else branch.

Well spotted, I'll fix that for patch V2.

Cheers.

-- 
Robert
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