linux-kernel - Re: [PATCH] batman-adv: Deinline batadv_orig_hash

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Message-ID: <571E1F70.3040001@redhat.com>
Date:	Mon, 25 Apr 2016 15:45:20 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Antonio Quartulli <a@...table.cc>
CC:	Marek Lindner <mareklindner@...mailbox.ch>,
	Simon Wunderlich <sw@...onwunderlich.de>,
	Sven Eckelmann <sven@...fation.org>,
	b.a.t.m.a.n@...ts.open-mesh.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] batman-adv: Deinline batadv_orig_hash_find, save 9024
 bytes

On 04/25/2016 03:39 PM, Antonio Quartulli wrote:
> On Mon, Apr 25, 2016 at 03:25:22PM +0200, Denys Vlasenko wrote:
>> This function compiles to 473 bytes of machine code.
>> 21 callsites.
>>
>>     text     data      bss       dec     hex filename
>> 95903266 20860288 35991552 152755106 91adba2 vmlinux_before
>> 95894242 20860288 35991552 152746082 91ab862 vmlinux
> 
> Hi Danys,
> 
> thanks for your patch. This function is used in a several performance critical
> code paths (i.e. packet forwarding).
> 
> Are we sure we are not losing in performance here?

Is this a common case?

	if (!hash)
		return NULL;

If yes, then we can inline this part only.