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From: Ard Biesheuvel <ardb@kernel.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Torvalds, Linus" <torvalds@linux-foundation.org>,
	Mateusz Guzik <mjguzik@gmail.com>,
	linux-arch <linux-arch@vger.kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
	Jan Glauber <jan.glauber@gmail.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: ia64 removal (was: Re: lockref scalability on x86-64 vs cpu_relax)
Date: Fri, 13 Jan 2023 08:55:41 +0100	[thread overview]
Message-ID: <CAMj1kXEqbMEcrKYzz2-huLPMnotPoxFY8adyH=Xb4Ex8o98x-w@mail.gmail.com> (raw)
In-Reply-To: <SJ1PR11MB6083368BCA43E5B0D2822FD3FCC29@SJ1PR11MB6083.namprd11.prod.outlook.com>

On Fri, 13 Jan 2023 at 01:31, Luck, Tony <tony.luck@intel.com> wrote:
>
> > Yeah, if it was ia64-only, it's a non-issue these days. It's dead and
> > in pure maintenance mode from a kernel perspective (if even that).
>
> There's not much "simultaneous" in the SMT on ia64. One thread in a
> spin loop will hog the core until the h/w switches to the other thread some
> number of cycles (hundreds, thousands? I really can remember). So I
> was pretty generous with dropping cpu_relax() into any kind of spin loop.
>
> Is it time yet for:
>
> $ git rm -r arch/ia64
>

Hi Tony,

Can I take that as an ack on [0]? The EFI subsystem has evolved
substantially over the years, and there is really no way to do any
IA64 testing beyond build testing, so from that perspective, dropping
it entirely would be welcomed.

Thanks,
Ard.



[0] https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=remove-ia64

WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: linux-arch <linux-arch@vger.kernel.org>,
	Mateusz Guzik <mjguzik@gmail.com>, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	Jan Glauber <jan.glauber@gmail.com>,
	"Torvalds, Linus" <torvalds@linux-foundation.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: ia64 removal (was: Re: lockref scalability on x86-64 vs cpu_relax)
Date: Fri, 13 Jan 2023 08:55:41 +0100	[thread overview]
Message-ID: <CAMj1kXEqbMEcrKYzz2-huLPMnotPoxFY8adyH=Xb4Ex8o98x-w@mail.gmail.com> (raw)
In-Reply-To: <SJ1PR11MB6083368BCA43E5B0D2822FD3FCC29@SJ1PR11MB6083.namprd11.prod.outlook.com>

On Fri, 13 Jan 2023 at 01:31, Luck, Tony <tony.luck@intel.com> wrote:
>
> > Yeah, if it was ia64-only, it's a non-issue these days. It's dead and
> > in pure maintenance mode from a kernel perspective (if even that).
>
> There's not much "simultaneous" in the SMT on ia64. One thread in a
> spin loop will hog the core until the h/w switches to the other thread some
> number of cycles (hundreds, thousands? I really can remember). So I
> was pretty generous with dropping cpu_relax() into any kind of spin loop.
>
> Is it time yet for:
>
> $ git rm -r arch/ia64
>

Hi Tony,

Can I take that as an ack on [0]? The EFI subsystem has evolved
substantially over the years, and there is really no way to do any
IA64 testing beyond build testing, so from that perspective, dropping
it entirely would be welcomed.

Thanks,
Ard.



[0] https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=remove-ia64

WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Torvalds, Linus" <torvalds@linux-foundation.org>,
	Mateusz Guzik <mjguzik@gmail.com>,
	 linux-arch <linux-arch@vger.kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	 Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	 "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	 "viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
	Jan Glauber <jan.glauber@gmail.com>,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: ia64 removal (was: Re: lockref scalability on x86-64 vs cpu_relax)
Date: Fri, 13 Jan 2023 08:55:41 +0100	[thread overview]
Message-ID: <CAMj1kXEqbMEcrKYzz2-huLPMnotPoxFY8adyH=Xb4Ex8o98x-w@mail.gmail.com> (raw)
In-Reply-To: <SJ1PR11MB6083368BCA43E5B0D2822FD3FCC29@SJ1PR11MB6083.namprd11.prod.outlook.com>

On Fri, 13 Jan 2023 at 01:31, Luck, Tony <tony.luck@intel.com> wrote:
>
> > Yeah, if it was ia64-only, it's a non-issue these days. It's dead and
> > in pure maintenance mode from a kernel perspective (if even that).
>
> There's not much "simultaneous" in the SMT on ia64. One thread in a
> spin loop will hog the core until the h/w switches to the other thread some
> number of cycles (hundreds, thousands? I really can remember). So I
> was pretty generous with dropping cpu_relax() into any kind of spin loop.
>
> Is it time yet for:
>
> $ git rm -r arch/ia64
>

Hi Tony,

Can I take that as an ack on [0]? The EFI subsystem has evolved
substantially over the years, and there is really no way to do any
IA64 testing beyond build testing, so from that perspective, dropping
it entirely would be welcomed.

Thanks,
Ard.



[0] https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=remove-ia64

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  parent reply	other threads:[~2023-01-13  7:56 UTC|newest]

Thread overview: 108+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-12 23:36 lockref scalability on x86-64 vs cpu_relax Mateusz Guzik
2023-01-13  0:13 ` Linus Torvalds
2023-01-13  0:13   ` Linus Torvalds
2023-01-13  0:13   ` Linus Torvalds
2023-01-13  0:30   ` Luck, Tony
2023-01-13  0:30     ` Luck, Tony
2023-01-13  0:30     ` Luck, Tony
2023-01-13  0:45     ` Linus Torvalds
2023-01-13  0:45       ` Linus Torvalds
2023-01-13  0:45       ` Linus Torvalds
2023-01-13  7:55     ` Ard Biesheuvel [this message]
2023-01-13  7:55       ` ia64 removal (was: Re: lockref scalability on x86-64 vs cpu_relax) Ard Biesheuvel
2023-01-13  7:55       ` Ard Biesheuvel
2023-01-13 16:17       ` Luck, Tony
2023-01-13 16:17         ` Luck, Tony
2023-01-13 16:17         ` Luck, Tony
2023-01-13 20:49       ` Jessica Clarke
2023-01-13 20:49         ` Jessica Clarke
2023-01-13 20:49         ` Jessica Clarke
2023-01-13 21:03         ` Luck, Tony
2023-01-13 21:03           ` Luck, Tony
2023-01-13 21:03           ` Luck, Tony
2023-01-13 21:04           ` Jessica Clarke
2023-01-13 21:04             ` Jessica Clarke
2023-01-13 21:04             ` Jessica Clarke
2023-01-13 21:05       ` John Paul Adrian Glaubitz
2023-01-13 21:05         ` John Paul Adrian Glaubitz
2023-01-13 21:05         ` John Paul Adrian Glaubitz
2023-01-13 23:25         ` Ard Biesheuvel
2023-01-13 23:25           ` Ard Biesheuvel
2023-01-13 23:25           ` Ard Biesheuvel
2023-01-14 11:24           ` Sedat Dilek
2023-01-14 11:24             ` Sedat Dilek
2023-01-14 11:24             ` Sedat Dilek
2023-01-14 11:28             ` Sedat Dilek
2023-01-14 11:28               ` Sedat Dilek
2023-01-14 11:28               ` Sedat Dilek
2023-01-15  0:27               ` Matthew Wilcox
2023-01-15  0:27                 ` Matthew Wilcox
2023-01-15  0:27                 ` Matthew Wilcox
2023-01-15 12:04                 ` Sedat Dilek
2023-01-15 12:04                   ` Sedat Dilek
2023-01-15 12:04                   ` Sedat Dilek
2023-01-16  9:42                   ` John Paul Adrian Glaubitz
2023-01-16  9:42                     ` John Paul Adrian Glaubitz
2023-01-16  9:42                     ` John Paul Adrian Glaubitz
2023-01-16  9:41                 ` John Paul Adrian Glaubitz
2023-01-16  9:41                   ` John Paul Adrian Glaubitz
2023-01-16  9:41                   ` John Paul Adrian Glaubitz
2023-01-16 13:28                   ` Matthew Wilcox
2023-01-16 13:28                     ` Matthew Wilcox
2023-01-16 13:28                     ` Matthew Wilcox
2023-01-16  9:40               ` John Paul Adrian Glaubitz
2023-01-16  9:40                 ` John Paul Adrian Glaubitz
2023-01-16  9:40                 ` John Paul Adrian Glaubitz
2023-01-16  9:37             ` John Paul Adrian Glaubitz
2023-01-16  9:37               ` John Paul Adrian Glaubitz
2023-01-16  9:37               ` John Paul Adrian Glaubitz
2023-01-16  9:32           ` John Paul Adrian Glaubitz
2023-01-16  9:32             ` John Paul Adrian Glaubitz
2023-01-16  9:32             ` John Paul Adrian Glaubitz
2023-01-16 10:09             ` Ard Biesheuvel
2023-01-16 10:09               ` Ard Biesheuvel
2023-01-16 10:09               ` Ard Biesheuvel
2023-01-13  1:12   ` lockref scalability on x86-64 vs cpu_relax Mateusz Guzik
2023-01-13  1:12     ` Mateusz Guzik
2023-01-13  1:12     ` Mateusz Guzik
2023-01-13  4:08     ` Linus Torvalds
2023-01-13  4:08       ` Linus Torvalds
2023-01-13  4:08       ` Linus Torvalds
2023-01-13  9:46     ` Will Deacon
2023-01-13  9:46       ` Will Deacon
2023-01-13  9:46       ` Will Deacon
2023-01-13  3:20   ` Nicholas Piggin
2023-01-13  3:20     ` Nicholas Piggin
2023-01-13  3:20     ` Nicholas Piggin
2023-01-13  4:15     ` Linus Torvalds
2023-01-13  4:15       ` Linus Torvalds
2023-01-13  4:15       ` Linus Torvalds
2023-01-13  5:36       ` Nicholas Piggin
2023-01-13  5:36         ` Nicholas Piggin
2023-01-13  5:36         ` Nicholas Piggin
2023-01-16 14:08     ` Memory transaction instructions David Howells
2023-01-16 14:08       ` David Howells
2023-01-16 15:09       ` Matthew Wilcox
2023-01-16 15:09         ` Matthew Wilcox
2023-01-16 15:09         ` Matthew Wilcox
2023-01-16 16:59       ` Linus Torvalds
2023-01-16 16:59         ` Linus Torvalds
2023-01-16 16:59         ` Linus Torvalds
2023-01-18  9:05       ` David Howells
2023-01-18  9:05         ` David Howells
2023-01-18  9:05         ` David Howells
2023-01-19  1:41         ` Nicholas Piggin
2023-01-19  1:41           ` Nicholas Piggin
2023-01-19  1:41           ` Nicholas Piggin
2023-01-13 10:23   ` lockref scalability on x86-64 vs cpu_relax Peter Zijlstra
2023-01-13 10:23     ` Peter Zijlstra
2023-01-13 10:23     ` Peter Zijlstra
2023-01-13 18:44   ` [PATCH] lockref: stop doing cpu_relax in the cmpxchg loop Mateusz Guzik
2023-01-13 18:44     ` Mateusz Guzik
2023-01-13 18:44     ` Mateusz Guzik
2023-01-13 21:47     ` Luck, Tony
2023-01-13 21:47       ` Luck, Tony
2023-01-13 21:47       ` Luck, Tony
2023-01-13 23:31       ` Linus Torvalds
2023-01-13 23:31         ` Linus Torvalds
2023-01-13 23:31         ` Linus Torvalds

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