linux-kernel - Re: [PATCH 2/2]: softirq: Add support for triggering softirq work on softirqs.

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Date:	Sat, 20 Sep 2008 03:35:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com, steffen.klassert@...unet.com
Subject: Re: [PATCH 2/2]: softirq: Add support for triggering softirq work
 on softirqs.

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Sat, 20 Sep 2008 00:46:08 -0700

> Seems from the above `>> 16' you're stuffing the softirq ID into the
> upper 16 bits of call_single_data.flags.  Is it needed?  Another u32
> can be added to call_single_data for free on 64-bit, or it could be
> split into two u16's.

call_single_data is already too large, simply adding it to
struct sk_buff had negative performance impacts that are
forcing me to trim the size of the existing structure a bit.

I think just documenting the usage of the bits is better, and
I'll do that in my next rev.
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