lkml.org 
[lkml]   [2011]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks
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


\
 
 \ /
  Last update: 2011-10-19 01:37    [W:0.123 / U:2.528 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site