From: Cliff Wickman <cpw@sgi.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org, alex.shi@intel.com,
jbeulich@suse.com, tglx@linutronix.de, hpa@zytor.com
Subject: Re: [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue]
Date: Thu, 13 Sep 2012 16:20:03 -0500 [thread overview]
Message-ID: <20120913212003.GA16789@sgi.com> (raw)
In-Reply-To: <20120913155310.GA4081@gmail.com>
On Thu, Sep 13, 2012 at 05:53:10PM +0200, Ingo Molnar wrote:
>
> Ack?
>
> Thanks,
>
> Ingo
Ack.
But with the adjustment below. The 'end' argument was not declared long.
I tested the patch on a UV.
It has the effect of either clearing 1 or all TLBs in a cpu.
I added some debugging to test for the cases when clearing all TLBs is
overkill, and in practice it happens very seldom.
Sorry I didn't participate in this patch earlier. Jack Steiner was
copied, I believe. But steiner@sgi.com is no longer active. Jack has
retired -- congratulations to him, but a very big loss to us, both
professionally and personally.
-Cliff
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Cliff Wickman <cpw@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
arch/x86/include/asm/uv/uv.h | 2 +-
arch/x86/platform/uv/tlb_uv.c | 10 +++++++---
2 files changed, 8 insertions(+), 4 deletions(-)
Index: linux/arch/x86/platform/uv/tlb_uv.c
===================================================================
--- linux.orig/arch/x86/platform/uv/tlb_uv.c
+++ linux/arch/x86/platform/uv/tlb_uv.c
@@ -1034,7 +1034,8 @@ static int set_distrib_bits(struct cpuma
* globally purge translation cache of a virtual address or all TLB's
* @cpumask: mask of all cpu's in which the address is to be removed
* @mm: mm_struct containing virtual address range
- * @va: virtual address to be removed (or TLB_FLUSH_ALL for all TLB's on cpu)
+ * @start: start virtual address to be removed from TLB
+ * @end: end virtual address to be remove from TLB
* @cpu: the current cpu
*
* This is the entry point for initiating any UV global TLB shootdown.
@@ -1056,7 +1057,7 @@ static int set_distrib_bits(struct cpuma
*/
const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long start,
- unsigned end, unsigned int cpu)
+ unsigned long end, unsigned int cpu)
{
int locals = 0;
int remotes = 0;
@@ -1113,7 +1114,10 @@ const struct cpumask *uv_flush_tlb_other
record_send_statistics(stat, locals, hubs, remotes, bau_desc);
- bau_desc->payload.address = start;
+ if (!end || (end - start) <= PAGE_SIZE)
+ bau_desc->payload.address = start;
+ else
+ bau_desc->payload.address = TLB_FLUSH_ALL;
bau_desc->payload.sending_cpu = cpu;
/*
* uv_flush_send_and_wait returns 0 if all cpu's were messaged,
Index: linux/arch/x86/include/asm/uv/uv.h
===================================================================
--- linux.orig/arch/x86/include/asm/uv/uv.h
+++ linux/arch/x86/include/asm/uv/uv.h
@@ -16,7 +16,7 @@ extern void uv_system_init(void);
extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long start,
- unsigned end,
+ unsigned long end,
unsigned int cpu);
#else /* X86_UV */
next parent reply other threads:[~2012-09-13 21:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20120913155310.GA4081@gmail.com>
2012-09-13 21:20 ` Cliff Wickman [this message]
2012-09-14 0:24 ` [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue] Alex Shi
2012-09-14 5:56 ` Ingo Molnar
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=20120913212003.GA16789@sgi.com \
--to=cpw@sgi.com \
--cc=alex.shi@intel.com \
--cc=hpa@zytor.com \
--cc=jbeulich@suse.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=tglx@linutronix.de \
/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;
as well as URLs for NNTP newsgroup(s).