From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xen.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
Keir Fraser <keir@xen.org>, Jan Beulich <JBeulich@suse.com>,
Tim Deegan <tim@xen.org>
Subject: [PATCH v2 1/5] x86/time: Avoid redundant this_cpu()
Date: Fri, 28 Feb 2014 18:57:00 +0000 [thread overview]
Message-ID: <1393613824-13230-2-git-send-email-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <1393613824-13230-1-git-send-email-andrew.cooper3@citrix.com>
this_cpu() makes use of RELOC_HIDE() to prevent unsafe optimisations, forcing
a recalculation of the per-cpu data area. Don't use it needlessly.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Keir Fraser <keir@xen.org>
CC: Jan Beulich <JBeulich@suse.com>
CC: Tim Deegan <tim@xen.org>
---
xen/arch/x86/time.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 82492c1..883c135 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -1323,7 +1323,7 @@ void init_percpu_time(void)
s_time_t now;
/* Initial estimate for TSC rate. */
- this_cpu(cpu_time).tsc_scale = per_cpu(cpu_time, 0).tsc_scale;
+ t->tsc_scale = per_cpu(cpu_time, 0).tsc_scale;
local_irq_save(flags);
rdtscll(t->local_tsc_stamp);
--
1.7.10.4
next prev parent reply other threads:[~2014-02-28 18:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-28 18:56 [RFC PATCH v2 0/5] Improvements to console timestamps Andrew Cooper
2014-02-28 18:57 ` Andrew Cooper [this message]
2014-02-28 18:57 ` [PATCH v2 2/5] x86/time: Always count s_time from Xen boot Andrew Cooper
2014-03-03 10:59 ` David Vrabel
2014-03-06 16:01 ` [PATCH v3] " Tim Deegan
2014-03-06 16:15 ` Jan Beulich
2014-03-06 16:18 ` Andrew Cooper
2014-02-28 18:57 ` [PATCH v2 3/5] x86/time: Initialise time earlier during start_secondary() Andrew Cooper
2014-03-04 9:02 ` Jan Beulich
2014-03-04 10:40 ` Andrew Cooper
2014-02-28 18:57 ` [PATCH v2 4/5] [RFC] xen/console: Provide timestamps as an offset since boot Andrew Cooper
2014-03-03 10:53 ` David Vrabel
2014-02-28 18:57 ` [PATCH v2 5/5] [RFC] Traditional console timestamps including milliseconds Andrew Cooper
2014-03-01 4:06 ` Julien Grall
2014-03-03 10:35 ` Andrew Cooper
2014-03-04 9:14 ` Jan Beulich
2014-03-04 10:30 ` Andrew Cooper
2014-03-04 20:51 ` Don Slutz
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