From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Gabriel Paubert <paubert@iram.es>,
Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
paulus@samba.org, anton@samba.org, npiggin@gmail.com
Subject: Re: [PATCH v3 11/11] powerpc: rewrite local_t using soft_irq
Date: Tue, 15 Nov 2016 20:35:44 +1100 [thread overview]
Message-ID: <1479202544.2608.56.camel@kernel.crashing.org> (raw)
In-Reply-To: <20161115080644.GA23527@visitor2.iram.es>
On Tue, 2016-11-15 at 09:06 +0100, Gabriel Paubert wrote:
>
> I'm really wondering whether this is the kind of thing that would
> benefit from transactions. But transactional memory was only implemented
> on Power7 and later IIRC, and we still need to support machines without
> transactional memory.
Power8 and later.
Also this is about *local* atomics not general atomics, so the overhead
of starting a transaction in that case is way way higher than the
proposed implementation.
Cheers,
Ben.
next prev parent reply other threads:[~2016-11-15 9:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-14 18:04 [PATCH v3 00/11]powerpc: "paca->soft_enabled" based local atomic operation implementation Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 01/11] powerpc: Add #defs for paca->soft_enabled flags Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 02/11] powerpc: move set_soft_enabled() and rename Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 03/11] powerpc: Use soft_enabled_set api to update paca->soft_enabled Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 04/11] powerpc: Add soft_enabled manipulation functions Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 05/11] powerpc: reverse the soft_enable logic Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 06/11] powerpc: Avoid using EXCEPTION_PROLOG_1 macro in MASKABLE_* Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 07/11] powerpc: Add support to take additional parameter in MASKABLE_* macro Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 08/11] powerpc: Add support to mask perf interrupts and replay them Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 09/11] powerpc:Add new kconfig IRQ_DEBUG_SUPPORT Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 10/11] powerpc: Add new set of soft_enabled_ functions Madhavan Srinivasan
2016-11-14 18:04 ` [PATCH v3 11/11] powerpc: rewrite local_t using soft_irq Madhavan Srinivasan
2016-11-15 8:06 ` Gabriel Paubert
2016-11-15 9:35 ` Benjamin Herrenschmidt [this message]
2016-11-28 1:39 ` Madhavan Srinivasan
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