From: Peter Zijlstra <peterz@infradead.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, x86@kernel.org,
Bin Yang <bin.yang@intel.com>, Mark Gross <mark.gross@intel.com>
Subject: Re: [PATCH 2/8] x86/mm/cpa: Move flush_tlb_all()
Date: Sat, 22 Sep 2018 12:37:52 +0200 [thread overview]
Message-ID: <20180922103752.GI24124@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <5ab3ee67-a29b-0f4c-d7cf-2bdedd192ad6@intel.com>
On Fri, Sep 21, 2018 at 02:34:32PM -0700, Dave Hansen wrote:
> On 09/19/2018 01:50 AM, Peter Zijlstra wrote:
> > @@ -1528,28 +1538,8 @@ static int __change_page_attr(struct cpa
> > * We have to split the large page:
> > */
> > err = split_large_page(cpa, kpte, address);
> > - if (!err) {
> ...
> > - flush_tlb_all();
> > + if (!err)
> > goto repeat;
> > - }
>
> I _think_ this is the only use of split_large_page()'s error code. We
> can just make it return void now, right?
Then how does it decide to goto repeat or error out?
> BTW, I also really like doing the "final" TLB flush as close as possible
> to the actual PTE manipulation. Makes it much less likely that we break it.
Yes.
next prev parent reply other threads:[~2018-09-22 10:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-19 8:50 [PATCH 0/8] x86/mm/cpa: Further optimizations Peter Zijlstra
2018-09-19 8:50 ` [PATCH 1/8] x86/mm/cpa: Use flush_tlb_all() Peter Zijlstra
2018-09-19 9:15 ` Peter Zijlstra
2018-09-19 10:08 ` Thomas Gleixner
2018-09-27 18:51 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 2/8] x86/mm/cpa: Move flush_tlb_all() Peter Zijlstra
2018-09-21 21:34 ` Dave Hansen
2018-09-22 10:37 ` Peter Zijlstra [this message]
2018-09-24 16:11 ` Dave Hansen
2018-09-27 18:52 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 3/8] x86/mm/cpa: Unconditionally avoid WBINDV when we can Peter Zijlstra
2018-09-27 18:53 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 4/8] x86/mm/cpa: Use flush_tlb_kernel_range() Peter Zijlstra
2018-09-27 18:53 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 5/8] x86/mm/cpa: Move CLFLUSH test into cpa_flush_range() Peter Zijlstra
2018-09-27 18:54 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 6/8] x86/mm/cpa: Move CLFLUSH test into cpa_flush_array() Peter Zijlstra
2018-09-27 18:54 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 7/8] x86/mm/cpa: Factor common code between cpa_flush_*() Peter Zijlstra
2018-09-27 18:55 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-19 8:50 ` [PATCH 8/8] x86/mm/cpa: Optimize __cpa_flush_range() Peter Zijlstra
2018-09-27 18:55 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-09-21 22:50 ` [PATCH 0/8] x86/mm/cpa: Further optimizations Dave Hansen
2018-09-21 22:50 ` Dave Hansen
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