From: Pavel Machek <pavel@ucw.cz>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>,
Richard Weinberger <richard.weinberger@gmail.com>,
Andi Kleen <andi@firstfloor.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: RFC: A reduced Linux network stack for small systems
Date: Fri, 9 May 2014 09:39:09 +0200 [thread overview]
Message-ID: <20140509073909.GE4965@xo-6d-61-c0.localdomain> (raw)
In-Reply-To: <CAADnVQ+nCtshedoDWN+QgiKzsCzBcojZOzrhkfzsqyXTpi4L=w@mail.gmail.com>
> >> that is likely working only for the given very limited set of applications.
> >> Kernel function profiling can potentially achieve the same thing.
> >> Profile the kernel with the set of apps and then prune all cold
> >> functions out of kernel.
> >
> > Right, and are Profile-Guided-Optimization results now reproduceable?
> > Better change it to Trace-Guided-Optimization. But yeah, for a
>
> not quite. I'm saying: no extra optimizations, no GCC changes.
> Compile kernel as-is. Most functions have a stub for mcount() already.
> Use it to track whether kernel function was called or not.
> Collect this data in userspace (as perf already does), add few
> more functions that had 'notrace' attribute on them, and feed this into
> special linker that unpacks existing vmlinux, throws away cold functions,
> relocates the rest and here you have tiny vmlinux without recompilation.
It sounds like unstripped kernel will not even fit on the target machine.
If it+application would fit there, you'd have no reason to strip it down...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2014-05-09 7:39 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-05 22:25 RFC: A reduced Linux network stack for small systems Andi Kleen
2014-05-05 22:25 ` [PATCH 01/24] net, diet: Reduce netdev name hash table for CONFIG_BASE_SMALL Andi Kleen
2014-05-06 3:03 ` David Miller
2014-05-05 22:25 ` [PATCH 02/24] net, diet: Reduce NAPI " Andi Kleen
2014-05-05 22:25 ` [PATCH 03/24] net, diet: Decrease ip defrag hash tables and max length with BASE_SMALL Andi Kleen
2014-05-05 22:25 ` [PATCH 04/24] net, diet: Make FIB hash tables smaller with CONFIG_BASE_SMALL Andi Kleen
2014-05-06 3:10 ` David Miller
2014-05-05 22:25 ` [PATCH 05/24] net, diet: Default to small TCP hash tables on small kernels Andi Kleen
2014-05-06 3:12 ` David Miller
2014-05-05 22:25 ` [PATCH 06/24] net, diet: Use small UDP " Andi Kleen
2014-05-06 3:11 ` David Miller
2014-05-06 14:26 ` Eric Dumazet
2014-05-06 18:23 ` Andi Kleen
2014-05-06 19:25 ` Eric Dumazet
2014-05-05 22:25 ` [PATCH 07/24] net, diet: Make ping sockets optional Andi Kleen
2014-05-06 3:04 ` David Miller
2014-05-05 22:25 ` [PATCH 08/24] net, diet: Make TCP metrics optional Andi Kleen
2014-05-05 23:18 ` Yuchung Cheng
2014-05-05 23:28 ` Andi Kleen
2014-05-06 3:12 ` David Miller
2014-05-06 3:21 ` Andi Kleen
2014-05-06 3:23 ` David Miller
2014-05-06 4:39 ` Tom Zanussi
2014-05-07 13:59 ` One Thousand Gnomes
2014-05-07 17:20 ` David Miller
2014-05-07 22:19 ` Tim Bird
2014-05-07 22:52 ` David Miller
2014-05-06 15:57 ` josh
2014-05-06 15:59 ` David Miller
2014-05-06 16:41 ` josh
2014-05-06 17:12 ` Rick Jones
2014-05-06 18:09 ` josh
2014-05-06 17:16 ` David Miller
2014-05-06 17:55 ` josh
2014-05-06 18:33 ` Cong Wang
2014-05-06 18:48 ` Andi Kleen
2014-05-06 19:19 ` Richard Cochran
2014-05-06 20:44 ` David Miller
2014-05-06 21:08 ` josh
2014-05-06 21:11 ` David Miller
2014-05-06 22:50 ` josh
2014-05-06 23:27 ` Eric Dumazet
2014-06-14 20:33 ` Pavel Machek
2014-06-23 10:17 ` zhuyj
2014-05-06 19:14 ` Richard Cochran
2014-05-06 19:50 ` Andi Kleen
2014-05-06 20:07 ` Richard Cochran
2014-05-06 21:05 ` Andi Kleen
2014-05-06 23:29 ` Eric Dumazet
2014-05-07 4:33 ` Andi Kleen
2014-05-06 20:46 ` David Miller
2014-05-07 8:39 ` David Laight
2014-05-09 9:48 ` Pavel Machek
2014-05-06 16:39 ` Eric Dumazet
2014-05-06 16:45 ` josh
2014-05-06 17:03 ` Eric Dumazet
2014-05-06 17:30 ` josh
2014-05-06 17:17 ` David Miller
2014-05-06 17:21 ` josh
2014-05-06 17:25 ` David Miller
2014-05-06 20:06 ` Andi Kleen
2014-05-06 20:47 ` David Miller
2014-05-06 20:11 ` josh
2014-05-06 20:44 ` Andi Kleen
2014-05-06 17:14 ` David Miller
2014-05-06 18:32 ` Andi Kleen
2014-05-06 18:58 ` Tom Herbert
2014-05-06 19:37 ` josh
2014-05-06 19:57 ` Andi Kleen
2014-05-06 20:17 ` Eric Dumazet
2014-05-06 20:27 ` josh
2014-05-06 20:37 ` Andi Kleen
2014-05-06 20:48 ` David Miller
2014-05-07 13:35 ` One Thousand Gnomes
2014-05-13 16:22 ` Christer Weinigel
2014-05-09 7:38 ` Pavel Machek
2014-05-05 22:25 ` [PATCH 09/24] net, diet: Make ethtool optional Andi Kleen
2014-05-06 3:11 ` David Miller
2014-05-06 3:14 ` Andi Kleen
2014-05-06 3:22 ` David Miller
2014-05-05 22:25 ` [PATCH 10/24] net, diet: Make LPF filter optional Andi Kleen
2014-05-06 3:10 ` David Miller
2014-05-05 22:26 ` [PATCH 11/24] net, diet: Move rtnl_lock to separate file Andi Kleen
2014-05-05 22:26 ` [PATCH 12/24] net, diet: Make rtnetlink optional Andi Kleen
2014-05-06 3:08 ` David Miller
2014-05-06 3:11 ` Andi Kleen
2014-05-05 22:26 ` [PATCH 13/24] net, diet: Make GRO offload optional Andi Kleen
2014-05-06 3:01 ` David Miller
2014-05-06 3:03 ` Andi Kleen
2014-05-05 22:26 ` [PATCH 14/24] net, diet: Make MIB statistics collections depend on PROC_FS Andi Kleen
2014-05-06 3:05 ` David Miller
2014-05-05 22:26 ` [PATCH 15/24] net, diet: Make igmp and mcast ioctls depend on IP_MULTICAST Andi Kleen
2014-05-05 22:26 ` [PATCH 16/24] net, diet: Make TCP fastopen optional Andi Kleen
2014-05-06 3:06 ` David Miller
2014-05-05 22:26 ` [PATCH 17/24] net, diet: Make internal control sockets use UDP Andi Kleen
2014-05-05 22:26 ` [PATCH 18/24] net, diet: Make raw sockets optional Andi Kleen
2014-05-06 3:12 ` David Miller
2014-05-05 22:26 ` [PATCH 19/24] net, diet: Make RPS configurable Andi Kleen
2014-05-06 3:14 ` David Miller
2014-05-06 3:16 ` Andi Kleen
2014-05-06 8:32 ` Bjørn Mork
2014-05-05 22:26 ` [PATCH 20/24] net, diet: Make XPS configurable Andi Kleen
2014-05-05 22:26 ` [PATCH 21/24] net, diet: Make packet tpacket/mmap/fanout/rings optional Andi Kleen
2014-05-06 3:09 ` David Miller
2014-05-05 22:26 ` [PATCH 22/24] net, diet: Support simpler routing table Andi Kleen
2014-05-06 3:02 ` David Miller
2014-05-06 3:08 ` Andi Kleen
2014-05-06 3:21 ` David Miller
2014-05-05 22:26 ` [PATCH 23/24] net, diet: Add coccinelle script to convert drivers to ETHTOOL_OPS Andi Kleen
2014-05-06 9:27 ` Nicolas Palix
2014-05-06 15:05 ` David Miller
2014-05-07 0:18 ` Wilfried Klaebe
2014-05-05 22:26 ` [PATCH 24/24] net, diet: Convert all drivers to use SET_ETHTOOL_OPS Andi Kleen
2014-05-06 7:25 ` RFC: A reduced Linux network stack for small systems Richard Weinberger
2014-05-06 13:34 ` Tom Zanussi
2014-05-06 15:20 ` Alexei Starovoitov
2014-05-06 15:34 ` Tom Zanussi
2014-05-06 17:20 ` Alexei Starovoitov
2014-05-06 20:00 ` Andi Kleen
2014-05-06 21:05 ` Alexei Starovoitov
2014-05-09 7:39 ` Pavel Machek [this message]
2014-05-09 7:38 ` Pavel Machek
2014-05-06 9:18 ` David Laight
2014-05-07 13:20 ` One Thousand Gnomes
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