linux-kernel - Re: [PATCH net-next v2 2/3] r8152: clear theflagofSCHEDULE

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Message-ID: <20141108221149.GA26030@electric-eye.fr.zoreil.com>
Date:	Sat, 8 Nov 2014 23:11:49 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Hayes Wang <hayeswang@...ltek.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/3] r8152: clear theflagofSCHEDULE_TASKLETin
 tasklet

Hayes Wang <hayeswang@...ltek.com> :
>  Francois Romieu [mailto:romieu@...zoreil.com] 
> > Sent: Monday, November 03, 2014 6:53 AM
> [...]
> > test_and_clear_bit (dense) or clear_bit would be more idiomatic.
> 
> Excuse me. Any suggestion?
> Should I use clear_bit directly, or something else?
> Or, do I have to remove this patch?

The performance explanation leaves me a bit unconvinced. Without any
figure one could simply go for the always locked clear_bit because of:
1. the "I'm racy" message that the open-coded test + set sends
2. the extra work needed to avoid 1 (comment, explain, ...).

The extra time could thus be used to see what happens when napi is
shoehorned in this tasklet machinery. I'd naively expect it to be
relevant for efficiency.

I won't mind if your agenda is completely different. :o)

-- 
Ueimor
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