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From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [C/R ARM][PATCH 1/3] ARM: Rudimentary syscall interfaces
Date: Tue, 23 Mar 2010 20:53:42 +0000	[thread overview]
Message-ID: <20100323205342.GA19572@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1269219965-23923-2-git-send-email-christofferdall@christofferdall.dk>

On Sun, Mar 21, 2010 at 09:06:03PM -0400, Christoffer Dall wrote:
> This small commit introduces a global state of system calls for ARM
> making it possible for a debugger or checkpointing to gain information
> about another process' state with respect to system calls.

I don't particularly like the idea that we always store the syscall
number to memory for every system call, whether the stored version is
used or not.

Since ARM caches are generally not write allocate, this means mostly
write-only variables can have a higher than expected expense.

Is there not some thread flag which can be checked to see if we need to
store the syscall number?

  reply	other threads:[~2010-03-23 20:53 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-22  1:06 [C/R ARM][PATCH 0/3] Linux Checkpoint-Restart - ARM port Christoffer Dall
2010-03-22  1:06 ` [C/R ARM][PATCH 1/3] ARM: Rudimentary syscall interfaces Christoffer Dall
2010-03-23 20:53   ` Russell King - ARM Linux [this message]
2010-03-24  2:03     ` Matt Helsley
2010-03-24  4:57       ` Oren Laadan
2010-03-24 14:02         ` Matt Helsley
2010-03-24 15:53           ` Oren Laadan
2010-03-24 19:36             ` Christoffer Dall
2010-03-25  1:11               ` Matt Helsley
2010-03-25  1:17                 ` Matt Helsley
2010-03-25 10:29                   ` Christoffer Dall
2010-03-25  1:35                 ` Oren Laadan
2010-03-25 10:34                   ` Christoffer Dall
2010-03-22  1:06 ` [C/R ARM][PATCH 2/3] ARM: Add the eclone system call Christoffer Dall
2010-03-23 21:06   ` Russell King - ARM Linux
2010-03-24 18:19     ` Sukadev Bhattiprolu
2010-03-24 19:42     ` Christoffer Dall
2010-03-22  1:06 ` [C/R ARM][PATCH 3/3] c/r: ARM implementation of checkpoint/restart Christoffer Dall
2010-03-23 16:09   ` Serge E. Hallyn
2010-03-24 19:46     ` Christoffer Dall
2010-03-23 21:18   ` Russell King - ARM Linux
2010-03-24  1:53     ` Matt Helsley
2010-03-24 20:48     ` Christoffer Dall
2010-03-26  2:47       ` Jamie Lokier
2010-03-26  3:02         ` Paul Mundt
2010-03-26  3:55           ` Jamie Lokier
2010-03-28 22:55           ` Christoffer Dall

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