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From: tim.bird@am•sony.com (Tim Bird)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks
Date: Tue, 18 Oct 2011 16:34:02 -0700	[thread overview]
Message-ID: <4E9E0CEA.6030102@am.sony.com> (raw)
In-Reply-To: <4E9E0B71.9020708@am.sony.com>

Reduce the max allowed size for struct poll_wqueue to avoid
using too much stack space in do_select() and do_sys_poll(),
when the kernel is using 4K stacks.

Signed-off-by: Tim Bird <tim.bird@am•sony.com>
---
 include/linux/poll.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/poll.h b/include/linux/poll.h
index cf40010..b7153a3 100644
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -16,7 +16,11 @@
 extern struct ctl_table epoll_table[]; /* for sysctl */
 /* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
    additional memory. */
+#ifndef CONFIG_4KSTACKS
 #define MAX_STACK_ALLOC 832
+#else
+#define MAX_STACK_ALLOC 448
+#endif
 #define FRONTEND_STACK_ALLOC	256
 #define SELECT_STACK_ALLOC	FRONTEND_STACK_ALLOC
 #define POLL_STACK_ALLOC	FRONTEND_STACK_ALLOC
-- 
1.6.6

  parent reply	other threads:[~2011-10-18 23:34 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-18 23:27 [PATCH 0/3] ARM 4Kstacks: introduction Tim Bird
2011-10-18 23:29 ` [PATCH 1/3] ARM 4Kstacks: Add support for 4K kernel stacks to ARM Tim Bird
2011-10-18 23:31 ` [PATCH 2/3] ARM: Add static kernel function stack size analyzer, for ARM Tim Bird
2011-10-19 10:45   ` Arnd Bergmann
2011-10-21 17:03     ` Andi Kleen
2011-10-18 23:34 ` Tim Bird [this message]
2011-10-20 12:21   ` [PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks Arnd Bergmann
2011-10-19  0:14 ` [PATCH 0/3] ARM 4Kstacks: introduction Joe Perches
2011-10-19  0:26   ` Tim Bird
2011-10-19  0:31     ` Joe Perches
2011-10-19 23:43       ` Tim Bird
2011-10-19  4:54     ` Dave Chinner
2011-10-19  5:02       ` Andi Kleen
2011-10-19 10:51     ` Arnd Bergmann
2011-10-22  8:50       ` Ming Lei
2011-10-22 13:13         ` Måns Rullgård
2011-10-22 14:27           ` Andi Kleen
2011-10-22 13:36         ` Russell King - ARM Linux
2011-10-23 19:25           ` Tim Bird
2011-10-23 20:11             ` Russell King - ARM Linux
2011-10-24 10:36           ` Ming Lei
2011-10-23 14:06       ` Bernd Petrovitsch
2011-10-19  4:33 ` Dave Chinner
2011-10-19  7:35 ` Russell King - ARM Linux
2011-10-19 23:36   ` Tim Bird
2011-10-20  0:13     ` Måns Rullgård
2011-10-20  1:08       ` Tim Bird
2011-10-20  1:55         ` Måns Rullgård
2011-10-20 22:21     ` Dave Chinner

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