* Re: [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue]
[not found] <20120913155310.GA4081@gmail.com>
@ 2012-09-13 21:20 ` Cliff Wickman
2012-09-14 0:24 ` Alex Shi
2012-09-14 5:56 ` Ingo Molnar
0 siblings, 2 replies; 3+ messages in thread
From: Cliff Wickman @ 2012-09-13 21:20 UTC (permalink / raw)
To: Ingo Molnar; +Cc: linux-kernel, alex.shi, jbeulich, tglx, hpa
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 But steiner@sgi.com is no longer active.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 */
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue]
2012-09-13 21:20 ` [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue] Cliff Wickman
@ 2012-09-14 0:24 ` Alex Shi
2012-09-14 5:56 ` Ingo Molnar
1 sibling, 0 replies; 3+ messages in thread
From: Alex Shi @ 2012-09-14 0:24 UTC (permalink / raw)
To: Cliff Wickman; +Cc: Ingo Molnar, linux-kernel, jbeulich, tglx, hpa
On 09/14/2012 05:20 AM, Cliff Wickman wrote:
> 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.
Thanks a lot for you all!
>
> 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.
Congratulations for Jack. :)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue]
2012-09-13 21:20 ` [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue] Cliff Wickman
2012-09-14 0:24 ` Alex Shi
@ 2012-09-14 5:56 ` Ingo Molnar
1 sibling, 0 replies; 3+ messages in thread
From: Ingo Molnar @ 2012-09-14 5:56 UTC (permalink / raw)
To: Cliff Wickman; +Cc: linux-kernel, alex.shi, jbeulich, tglx, hpa
* Cliff Wickman <cpw@sgi.com> wrote:
> 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.
Ok, great - mind sending the updated patch properly under a new
title (the old one doesn't seem ideal), with an expanded
changelog and with a Signed-off-by: Cliff Wickman, instead of
the Acked-by?
Thanks,
Ingo
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <20120913155310.GA4081@gmail.com>
2012-09-13 21:20 ` [alex.shi@intel.com: Re: [PATCH] UV: fix incorrect tlb flush all issue] Cliff Wickman
2012-09-14 0:24 ` Alex Shi
2012-09-14 5:56 ` Ingo Molnar
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