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

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Message-ID: <alpine.LNX.2.00.1211202103460.16323@eggly.anvils>
Date:	Tue, 20 Nov 2012 21:07:39 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mm: trace filemap add and del

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.

Hugh
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