From: Tsutomu OWA <tsutomu.owa@toshiba•co.jp>
To: Thomas Gleixner <tglx@linutronix•de>
Cc: linuxppc-dev@ozlabs•org, mingo@elte•hu, linux-kernel@vger•kernel.org
Subject: Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size
Date: Mon, 14 May 2007 16:28:04 +0900 [thread overview]
Message-ID: <yyitzuf9857.wl@toshiba.co.jp> (raw)
In-Reply-To: <1179125506.22481.297.camel@localhost.localdomain>
At Mon, 14 May 2007 08:51:46 +0200, Thomas Gleixner wrote:
> On Mon, 2007-05-14 at 15:38 +0900, Tsutomu OWA wrote:
> > As I don't know how long it takes on other platforms, it would be better to
> > enclose it within #ifdef CONFIG_PPC_CELLEB.
>
> Yes, that might be appropriate. Can you add this and resend please ?
Certainly, and thanks for your comment.
To reduce scheduling latecy by changing tlb flush size to 1.
Since tlb flush on Celleb is done by calling (an) expensive hypervisor call(s),
it takes a long time to flush tlbs and causes scheduing latency.
Signed-off-by: Tsutomu OWA <tsutomu.owa@toshiba•co.jp>
-- owa
--- linux-2.6.21-rt1/include/asm-powerpc/tlbflush.h 2007-04-26 12:08:32.000000000 +0900
+++ rt/include/asm-powerpc/tlbflush.h 2007-05-14 16:12:47.000000000 +0900
@@ -25,7 +25,12 @@ struct mm_struct;
#include <linux/percpu.h>
#include <asm/page.h>
+#if defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT)
+/* Since tlb flush takes long time on Celleb, reduce it to 1 when Celleb && RT */
+#define PPC64_TLB_BATCH_NR 1
+#else
#define PPC64_TLB_BATCH_NR 192
+#endif /* defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT) */
struct ppc64_tlb_batch {
unsigned long index;
next prev parent reply other threads:[~2007-05-14 7:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-14 6:22 [patch 0/4] powerpc 2.6.21-rt1: fix build a breakage and some minor issues Tsutomu OWA
2007-05-14 6:26 ` [patch 1/4] powerpc 2.6.21-rt1: fix a build breakage by adding __raw_*_relax() macros Tsutomu OWA
2007-05-14 6:28 ` [patch 2/4] powerpc 2.6.21-rt1: convert spinlocks to raw ones for Celleb Tsutomu OWA
2007-05-14 6:29 ` [patch 3/4] powerpc 2.6.21-rt1: add a need_resched_delayed() check Tsutomu OWA
2007-05-14 6:30 ` [patch 0/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size Tsutomu OWA
2007-05-14 6:38 ` [patch 4/4] " Tsutomu OWA
2007-05-14 6:51 ` Thomas Gleixner
2007-05-14 7:28 ` Tsutomu OWA [this message]
2007-05-14 14:40 ` Arnd Bergmann
2007-05-15 4:12 ` Tsutomu OWA
2007-05-15 7:34 ` Benjamin Herrenschmidt
2007-05-15 6:27 ` Tsutomu OWA
2007-05-15 7:38 ` Benjamin Herrenschmidt
2007-05-15 8:08 ` Tsutomu OWA
2007-05-15 8:40 ` Benjamin Herrenschmidt
2007-05-15 7:23 ` Benjamin Herrenschmidt
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=yyitzuf9857.wl@toshiba.co.jp \
--to=tsutomu.owa@toshiba$(echo .)co.jp \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=linuxppc-dev@ozlabs$(echo .)org \
--cc=mingo@elte$(echo .)hu \
--cc=tglx@linutronix$(echo .)de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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