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From: Peter Zijlstra <peterz@infradead.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Nick Piggin <npiggin@gmail.com>,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>,
	"David S. Miller" <davem@davemloft.net>,
	Helge Deller <deller@gmx.de>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Paul Burton <paulburton@kernel.org>,
	Tony Luck <tony.luck@intel.com>,
	Richard Henderson <rth@twiddle.net>,
	Nick Hu <nickhu@andestech.com>,
	Paul Walmsley <paul.walmsley@sifive.com>
Subject: Re: [PATCH 05/17] asm-generic/tlb: Rename HAVE_RCU_TABLE_NO_INVALIDATE
Date: Mon, 16 Dec 2019 14:20:04 +0100	[thread overview]
Message-ID: <20191216132004.GO2844@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <d52ea890-c2ea-88f3-9d62-b86e60ee77ae@linux.ibm.com>

On Mon, Dec 16, 2019 at 06:43:53PM +0530, Aneesh Kumar K.V wrote:
> On 12/16/19 6:07 PM, Peter Zijlstra wrote:

> > I'm confused, are you saing you're happy to have PowerPC eat the extra
> > TLB invalidates? I thought you cared about PPC performance :-)
> > 
> > 
> 
> Instead can we do
> 
> static inline void tlb_table_invalidate(struct mmu_gather *tlb)
> {
> #ifndef CONFIG_MMU_GATHER_RCU_TABLE_FREE
> 	 * Invalidate page-table caches used by hardware walkers. Then we still
> 	 * need to RCU-sched wait while freeing the pages because software
> 	 * walkers can still be in-flight.
> 	 */
> 	tlb_flush_mmu_tlbonly(tlb);
> #endif
> }

How does that not break ARM/ARM64/s390 and x86 ?

  reply	other threads:[~2019-12-16 13:20 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11 12:07 [PATCH 00/17] Fixup page directory freeing Peter Zijlstra
2019-12-11 12:07 ` [PATCH 01/17] sh/tlb: Fix PGTABLE_LEVELS > 2 Peter Zijlstra
2019-12-11 12:07 ` [PATCH 02/17] asm-gemeric/tlb: Remove stray function declarations Peter Zijlstra
2019-12-11 13:19   ` Geert Uytterhoeven
2019-12-11 13:19     ` Geert Uytterhoeven
2019-12-11 12:07 ` [PATCH 03/17] asm-generic/tlb: Add missing CONFIG symbol Peter Zijlstra
2019-12-11 12:07 ` [PATCH 04/17] asm-generic/tlb: Rename HAVE_RCU_TABLE_FREE Peter Zijlstra
2019-12-11 12:07 ` [PATCH 05/17] asm-generic/tlb: Rename HAVE_RCU_TABLE_NO_INVALIDATE Peter Zijlstra
2019-12-16 12:31   ` Aneesh Kumar K.V
2019-12-16 12:31     ` Aneesh Kumar K.V
2019-12-16 12:37     ` Peter Zijlstra
2019-12-16 13:13       ` Aneesh Kumar K.V
2019-12-16 13:20         ` Peter Zijlstra [this message]
2019-12-16 13:40           ` Aneesh Kumar K.V
2019-12-16 13:54             ` Aneesh Kumar K.V
2019-12-16 14:50               ` Peter Zijlstra
2019-12-16 15:14                 ` Peter Zijlstra
2019-12-16 15:14                   ` Peter Zijlstra
2019-12-16 15:30                   ` Peter Zijlstra
2019-12-16 17:00                     ` Aneesh Kumar K.V
2019-12-17  8:51                   ` Peter Zijlstra
2019-12-16 14:00             ` Peter Zijlstra
2019-12-11 12:07 ` [PATCH 06/17] asm-generic/tlb: Rename HAVE_MMU_GATHER_PAGE_SIZE Peter Zijlstra
2019-12-11 12:07 ` [PATCH 07/17] asm-generic/tlb: Rename HAVE_MMU_GATHER_NO_GATHER Peter Zijlstra
2019-12-11 12:07 ` [PATCH 08/17] asm-generic/tlb: Provide MMU_GATHER_TABLE_FREE Peter Zijlstra
2019-12-12  9:30   ` Peter Zijlstra
2019-12-12  9:32   ` [PATCH mk-II " Peter Zijlstra
2020-01-26 15:52     ` Guenter Roeck
2020-01-27  8:11       ` Peter Zijlstra
2020-01-27  8:13         ` Aneesh Kumar K.V
2020-01-27 13:05           ` Peter Zijlstra
2020-01-27 13:42             ` Aneesh Kumar K.V
2019-12-11 12:07 ` [PATCH 09/17] sh/tlb: Fix __pmd_free_tlb() Peter Zijlstra
2019-12-11 12:07 ` [PATCH 10/17] sparc32/tlb: Fix __p*_free_tlb() Peter Zijlstra
2019-12-11 12:07 ` [PATCH 11/17] parisc/tlb: " Peter Zijlstra
2019-12-11 12:07 ` [PATCH 12/17] m68k/tlb: " Peter Zijlstra
2019-12-11 12:07 ` [PATCH 13/17] mips/tlb: " Peter Zijlstra
2019-12-11 12:07 ` [PATCH 14/17] ia64/tlb: " Peter Zijlstra
2019-12-11 12:07 ` [PATCH 15/17] alpha/tlb: " Peter Zijlstra
2019-12-11 12:07 ` [PATCH 16/17] nds32/tlb: " Peter Zijlstra
2019-12-11 12:07 ` [PATCH 17/17] riscv/tlb: " Peter Zijlstra

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