From: john stultz <johnstul@us.ibm.com>
To: lkml <linux-kernel@vger.kernel.org>
Cc: Andrea Arcangeli <andrea@suse.de>, Andi Kleen <ak@suse.de>,
Ulrich Drepper <drepper@redhat.com>,
Jamie Lokier <jamie@shareable.org>,
"Martin J. Bligh" <mbligh@aracnet.com>,
Wim Coekaerts <wim.coekaerts@oracle.com>,
Joel Becker <Joel.Becker@oracle.com>,
Chris McDermott <lcm@us.ibm.com>
Subject: [RFC][PATCH] linux-2.6.4-pre1_vsyscall-gtod_B3-part3 (3/3)
Date: Wed, 03 Mar 2004 16:14:08 -0800 [thread overview]
Message-ID: <1078359248.10076.197.camel@cog.beaverton.ibm.com> (raw)
In-Reply-To: <1078359191.10076.195.camel@cog.beaverton.ibm.com>
All,
This patch implements the somewhat controversial vDSO hooks for
vsyscall-gtod. This makes LD_PRELOADing or changes to glibc unnecessary,
but requires that the system have a sysenter enabled glibc to see any
performance benifit. However the LD_PRELOAD method will still work as
well with this patch. This patch depends on both vsyscall-gtod_B3-part1
and vsyscall-gtod_B3-part2.
thanks
-john
diff -Nru a/arch/i386/kernel/vsyscall-int80.S b/arch/i386/kernel/vsyscall-int80.S
--- a/arch/i386/kernel/vsyscall-int80.S Wed Mar 3 15:40:05 2004
+++ b/arch/i386/kernel/vsyscall-int80.S Wed Mar 3 15:40:05 2004
@@ -1,3 +1,6 @@
+#include <linux/config.h>
+#include <asm/unistd.h>
+#include <asm/vsyscall-gtod.h>
/*
* Code for the vsyscall page. This version uses the old int $0x80 method.
*/
@@ -7,8 +10,26 @@
.type __kernel_vsyscall,@function
__kernel_vsyscall:
.LSTART_vsyscall:
+#ifdef CONFIG_VSYSCALL_GTOD
+ cmp $__NR_gettimeofday, %eax
+ je .Lvgettimeofday
+#endif /* CONFIG_VSYSCALL_GTOD */
int $0x80
ret
+
+#ifdef CONFIG_VSYSCALL_GTOD
+/* vsyscall-gettimeofday code */
+.Lvgettimeofday:
+ pushl %edx
+ pushl %ecx
+ pushl %ebx
+ call VSYSCALL_GTOD_START
+ popl %ebx
+ popl %ecx
+ popl %edx
+ ret
+#endif /* CONFIG_VSYSCALL_GTOD */
+
.LEND_vsyscall:
.size __kernel_vsyscall,.-.LSTART_vsyscall
.previous
diff -Nru a/arch/i386/kernel/vsyscall-sysenter.S b/arch/i386/kernel/vsyscall-sysenter.S
--- a/arch/i386/kernel/vsyscall-sysenter.S Wed Mar 3 15:40:05 2004
+++ b/arch/i386/kernel/vsyscall-sysenter.S Wed Mar 3 15:40:05 2004
@@ -1,3 +1,6 @@
+#include <linux/config.h>
+#include <asm/unistd.h>
+#include <asm/vsyscall-gtod.h>
/*
* Code for the vsyscall page. This version uses the sysenter instruction.
*/
@@ -7,6 +10,10 @@
.type __kernel_vsyscall,@function
__kernel_vsyscall:
.LSTART_vsyscall:
+#ifdef CONFIG_VSYSCALL_GTOD
+ cmp $__NR_gettimeofday, %eax
+ je .Lvgettimeofday
+#endif /* CONFIG_VSYSCALL_GTOD */
push %ecx
.Lpush_ecx:
push %edx
@@ -31,6 +38,20 @@
pop %ecx
.Lpop_ecx:
ret
+
+#ifdef CONFIG_VSYSCALL_GTOD
+/* vsyscall-gettimeofday code */
+.Lvgettimeofday:
+ pushl %edx
+ pushl %ecx
+ pushl %ebx
+ call VSYSCALL_GTOD_START
+ popl %ebx
+ popl %ecx
+ popl %edx
+ ret
+#endif /* CONFIG_VSYSCALL_GTOD */
+
.LEND_vsyscall:
.size __kernel_vsyscall,.-.LSTART_vsyscall
.previous
next prev parent reply other threads:[~2004-03-04 0:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-04 0:11 [RFC][PATCH] vsyscall-gtod_B3 (0/3) john stultz
2004-03-04 0:12 ` [RFC][PATCH] linux-2.6.4-pre1_vsyscall-gtod_B3-part1 (1/3) john stultz
2004-03-04 0:13 ` [RFC][PATCH] linux-2.6.4-pre1_vsyscall-gtod_B3-part2 (2/3) john stultz
2004-03-04 0:14 ` john stultz [this message]
2004-03-04 0:55 ` [RFC][PATCH] linux-2.6.4-pre1_vsyscall-gtod_B3-part3 (3/3) Andrea Arcangeli
2004-03-04 2:16 ` Ulrich Drepper
2004-03-04 2:43 ` john stultz
2004-03-04 3:14 ` Andrea Arcangeli
2004-03-04 8:09 ` Ulrich Drepper
2004-03-04 19:02 ` john stultz
2004-03-04 2:47 ` Andrea Arcangeli
2004-03-04 2:54 ` john stultz
2004-03-04 3:15 ` Andrea Arcangeli
2004-03-04 8:57 ` Jakub Jelinek
2004-03-04 16:45 ` Andrea Arcangeli
2004-03-04 8:00 ` Jamie Lokier
2004-03-04 8:37 ` Jakub Jelinek
2004-03-04 17:48 ` Andrea Arcangeli
2004-03-04 0:15 ` [RFC] vsyscall-gtod_test_B3.tar.gz john stultz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1078359248.10076.197.camel@cog.beaverton.ibm.com \
--to=johnstul@us.ibm.com \
--cc=Joel.Becker@oracle.com \
--cc=ak@suse.de \
--cc=andrea@suse.de \
--cc=drepper@redhat.com \
--cc=jamie@shareable.org \
--cc=lcm@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mbligh@aracnet.com \
--cc=wim.coekaerts@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®