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From: Andi Kleen <ak@linux.intel.com>
To: Greg KH <greg@kroah.com>, "Liang, Kan" <kan.liang@linux.intel.com>
Cc: peterz@infradead.org, mingo@redhat.com,
	linux-kernel@vger.kernel.org, eranian@google.com,
	namhyung@kernel.org, acme@kernel.org, jolsa@redhat.com
Subject: Re: [PATCH 2/7] perf: Create a symlink for a PMU
Date: Thu, 24 Jun 2021 10:49:42 -0700	[thread overview]
Message-ID: <1d77c148-7ea6-4631-d799-e8ec3d31f347@linux.intel.com> (raw)
In-Reply-To: <YNTCa5QO1YMy8fJ0@kroah.com>


> That is not how sysfs and the driver model works, sorry.  You don't get
> to keep both names, otherwise sysfs would be even more of a mess than it
> currently is.  What happens if you need "another" name in the future?
> When do you stop

I don't see any scenario where we would ever need more than a single 
symlink.

I believe there is already precedent for this elsewhere.

>
> this isn't ok, please do it right.

I don't see what exactly are you proposing.

Are you proposing to break every perf script on a kernel update? Doesn't 
seem acceptable to me.

Or move the compatibility into the perf tool? That would require the 
users to both update the perf tool and the kernel. I suppose it would be 
possible, but it would be totally against the standard perf abstraction 
design. Besides there are other consumers of this than just the perf 
tool, so it could possibly have a wide impact.

-Andi


  reply	other threads:[~2021-06-24 17:49 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24  1:22 [PATCH 0/7] perf: Add Sapphire Rapids server uncore support kan.liang
2021-06-24  1:22 ` [PATCH 1/7] driver core: Add a way to get to bus devices kset kan.liang
2021-06-24  5:41   ` Greg KH
2021-06-24  1:22 ` [PATCH 2/7] perf: Create a symlink for a PMU kan.liang
2021-06-24  5:48   ` Greg KH
2021-06-24 14:24     ` Andi Kleen
2021-06-24 14:29       ` Greg KH
2021-06-24 15:24         ` Andi Kleen
2021-06-24 15:31           ` Greg KH
2021-06-24 17:07             ` Liang, Kan
2021-06-24 17:35               ` Greg KH
2021-06-24 17:49                 ` Andi Kleen [this message]
2021-06-25  5:18                   ` Greg KH
2021-06-25  5:17               ` Greg KH
2021-06-24 17:28             ` Andi Kleen
2021-06-25  5:19               ` Greg KH
2021-06-25 14:22                 ` Andi Kleen
2021-06-25 14:38                   ` Greg KH
2021-06-25 14:49                     ` Andi Kleen
2021-06-25 15:03                       ` Liang, Kan
2021-06-25 15:44                         ` Andi Kleen
2021-06-25 15:57                           ` Liang, Kan
2021-06-25 16:18                             ` Liang, Kan
2021-06-27 11:02                       ` Greg KH
2021-06-27 16:30                         ` Andi Kleen
2021-06-28  6:55                           ` Greg KH
2021-06-28 15:00                             ` Andi Kleen
2021-06-24  1:22 ` [PATCH 3/7] perf/x86/intel/uncore: Create a symlink for an uncore PMU kan.liang
2021-06-24  5:44   ` Greg KH
2021-06-24  1:22 ` [PATCH 4/7] perf/x86/intel/uncore: Add Sapphire Rapids server support kan.liang
2021-06-24  1:22 ` [PATCH 5/7] perf/x86/intel/uncore: Factor out snr_uncore_mmio_map() kan.liang
2021-06-24  1:22 ` [PATCH 6/7] perf/x86/intel/uncore: Support free-running counters on Sapphire Rapids server kan.liang
2021-06-24  1:22 ` [PATCH 7/7] perf/x86/intel/uncore: Fix invalid unit check kan.liang

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