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From: Bruce Richardson <bruce.richardson@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: Omkar Maslekar <omkar.maslekar@intel.com>, dev <dev@dpdk.org>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Ciara Loftus <ciara.loftus@intel.com>,
	David Christensen <drc@linux.vnet.ibm.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	"Ruifeng Wang (Arm Technology China)" <ruifeng.wang@arm.com>,
	Jan Viktorin <viktorin@rehivetech.com>,
	Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [PATCH v5] eal: add cache-line demote support
Date: Thu, 8 Oct 2020 10:02:43 +0100
Message-ID: <20201008090243.GA1106@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <CAJFAV8xcqC9mMRjDsXEHO8upbeMmupg5bc313OU8R0dNHdg4FQ@mail.gmail.com>

On Thu, Oct 08, 2020 at 09:09:52AM +0200, David Marchand wrote:
> On Thu, Oct 1, 2020 at 2:30 AM Omkar Maslekar <omkar.maslekar@intel.com> wrote:
> >
> > rte_cldemote is similar to a prefetch hint - in reverse. cldemote(addr)
> > enables software to hint to hardware that line is likely to be shared.
> > Useful in core-to-core communications where cache-line is likely to be
> > shared. ARM and PPC implementation is provided with NOP and can be added
> > if any equivalent instructions could be used for implementation on those
> > architectures.
> >
> > Signed-off-by: Omkar Maslekar <omkar.maslekar@intel.com>
> > Acked-by: Bruce Richardson <bruce.richardson@intel.com>
> 
> I find this "rte_cldemote" name too close to the Intel instruction,
> but I can see no complaint from other arch maintainers, so I guess
> everyone is happy with it.

It is very close, alright - though the name too does fairly well convey the
likely actual done by the instruction.. Is there a suggestion for a better,
more generic name.

> In any case, this is a new API, so it should be marked experimental.
> 
Agreed.

> As for unit tests, not sure there is much to do, maybe rename
> test_prefetch.c and call this new API too, wdyt?
> 
I'm not sure how much value this would provide, but it can be done.


  reply	other threads:[~2020-10-08  9:02 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10  1:16 [dpdk-dev] [PATCH] EAL: An addition of cache line demote (CLDEMOTE) in rte_prefetch.h Omkar Maslekar
2020-09-10  1:16 ` Omkar Maslekar
2020-09-10  8:55   ` Bruce Richardson
2020-09-10 23:30     ` Maslekar, Omkar
2020-09-10 22:04   ` David Christensen
2020-09-11 16:51 ` [dpdk-dev] [PATCH v2] " Omkar Maslekar
2020-09-11 16:51   ` Omkar Maslekar
2020-09-11 21:22 ` [dpdk-dev] [PATCH v3] " Omkar Maslekar
2020-09-11 21:22   ` Omkar Maslekar
2020-09-22  1:59 ` [dpdk-dev] [PATCH v4] eal: add cache-line demote support Omkar Maslekar
2020-09-22  1:59   ` Omkar Maslekar
2020-09-22  8:28     ` Bruce Richardson
2020-09-22 21:53       ` Maslekar, Omkar
2020-10-01  0:28 ` [dpdk-dev] [PATCH v5] " Omkar Maslekar
2020-10-01  0:28   ` Omkar Maslekar
2020-10-08  7:09     ` David Marchand
2020-10-08  9:02       ` Bruce Richardson [this message]
2020-10-12  9:41         ` David Marchand
2020-10-08 13:12     ` Jerin Jacob
2020-10-12 10:19 ` [dpdk-dev] [PATCH v6] " Omkar Maslekar
2020-10-12 10:19   ` Omkar Maslekar
2020-10-12 19:31     ` David Christensen
2020-10-13  2:59     ` Ruifeng Wang
2020-10-13 16:20       ` Bruce Richardson
2020-10-14  1:55         ` Ruifeng Wang
2020-10-14  7:14         ` David Marchand
2020-10-14  7:51           ` Ruifeng Wang
2020-10-13  9:43 ` [dpdk-dev] [PATCH v7] " Omkar Maslekar
2020-10-13  9:43   ` Omkar Maslekar
2020-10-14  7:24     ` Ruifeng Wang
2020-10-15  8:01     ` David Marchand
2020-10-15 14:41       ` Maslekar, Omkar
2020-10-15 20:32         ` David Marchand
2020-10-15 15:18 ` [dpdk-dev] [PATCH v8] " Omkar Maslekar
2020-10-15 15:18   ` Omkar Maslekar
2020-10-15 23:20 ` [dpdk-dev] [PATCH v9] " Omkar Maslekar
2020-10-15 23:20   ` Omkar Maslekar
2020-10-16 12:14     ` David Marchand

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