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
WARNING: multiple messages have this Message-ID (diff)
From: Tim Bird <tim.bird@am.sony.com>
To: Russell King <rmk@arm.linux.org.uk>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Arnd Bergmann <arnd@arndb.de>, Andi Kleen <andi@firstfloor.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux kernel <linux-kernel@vger.kernel.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
next prev parent reply other threads:[~2011-10-18 23:34 UTC|newest]
Thread overview: 58+ 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 23:27 ` 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 23:29 ` Tim Bird
2011-10-18 23:31 ` [PATCH 2/3] ARM: Add static kernel function stack size analyzer, for ARM Tim Bird
2011-10-18 23:31 ` Tim Bird
2011-10-19 10:45 ` Arnd Bergmann
2011-10-19 10:45 ` Arnd Bergmann
2011-10-21 17:03 ` Andi Kleen
2011-10-21 17:03 ` Andi Kleen
2011-10-18 23:34 ` Tim Bird [this message]
2011-10-18 23:34 ` [PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks Tim Bird
2011-10-20 12:21 ` Arnd Bergmann
2011-10-20 12:21 ` Arnd Bergmann
2011-10-19 0:14 ` [PATCH 0/3] ARM 4Kstacks: introduction Joe Perches
2011-10-19 0:14 ` Joe Perches
2011-10-19 0:26 ` Tim Bird
2011-10-19 0:26 ` Tim Bird
2011-10-19 0:31 ` Joe Perches
2011-10-19 0:31 ` Joe Perches
2011-10-19 23:43 ` Tim Bird
2011-10-19 23:43 ` Tim Bird
2011-10-19 4:54 ` Dave Chinner
2011-10-19 4:54 ` Dave Chinner
2011-10-19 5:02 ` Andi Kleen
2011-10-19 5:02 ` Andi Kleen
2011-10-19 10:51 ` Arnd Bergmann
2011-10-19 10:51 ` Arnd Bergmann
2011-10-22 8:50 ` Ming Lei
2011-10-22 8:50 ` Ming Lei
2011-10-22 13:13 ` Måns Rullgård
2011-10-22 13:13 ` Måns Rullgård
2011-10-22 14:27 ` Andi Kleen
2011-10-22 14:27 ` Andi Kleen
2011-10-22 13:36 ` Russell King - ARM Linux
2011-10-22 13:36 ` Russell King - ARM Linux
2011-10-23 19:25 ` Tim Bird
2011-10-23 19:25 ` Tim Bird
2011-10-23 20:11 ` Russell King - ARM Linux
2011-10-23 20:11 ` Russell King - ARM Linux
2011-10-24 10:36 ` Ming Lei
2011-10-24 10:36 ` Ming Lei
2011-10-23 14:06 ` Bernd Petrovitsch
2011-10-23 14:06 ` Bernd Petrovitsch
2011-10-19 4:33 ` Dave Chinner
2011-10-19 4:33 ` Dave Chinner
2011-10-19 7:35 ` Russell King - ARM Linux
2011-10-19 7:35 ` Russell King - ARM Linux
2011-10-19 23:36 ` Tim Bird
2011-10-19 23:36 ` Tim Bird
2011-10-20 0:13 ` Måns Rullgård
2011-10-20 0:13 ` Måns Rullgård
2011-10-20 1:08 ` Tim Bird
2011-10-20 1:08 ` Tim Bird
2011-10-20 1:55 ` Måns Rullgård
2011-10-20 1:55 ` Måns Rullgård
2011-10-20 22:21 ` Dave Chinner
2011-10-20 22:21 ` Dave Chinner
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