linux-kernel - Re: [patch - v3] epoll ready set loops diet ...

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0702281115090.6806@alien.or.mcafeemobile.com>
Date:	Wed, 28 Feb 2007 11:23:37 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch - v3] epoll ready set loops diet ...

On Wed, 28 Feb 2007, Eric Dumazet wrote:

> On Wednesday 28 February 2007 19:37, Davide Libenzi wrote:
> 
> > +		list_del(&epi->rdllink);
> > +		if (!(epi->event.events & EPOLLET) && (revents & epi->event.events))
> > +			list_add_tail(&epi->rdllink, &injlist);
> > +		else {
> 
> Is the ( ... & epi->event.events) really necessary ? (It seems already done)

Yes, look here:

	if (epi->event.events & EPOLLONESHOT)
                 epi->event.events &= EP_PRIVATE_BITS;

Oneshot events should not be requeued.


> I was wrong about the size of epitem : it is now 68 bytes instead of 72.
> At least we now use/dirty one cache line instead of two per epitem.
> 
> Do you have another brilliant idea to shrink 4 more bytes ? :)

I don't think we can cleanly shove more stuff out of it.



- Davide


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/