linux-kernel - RE: [PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool

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Date: Mon, 12 Feb 2024 18:45:34 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Borislav Petkov <bp@...en8.de>
CC: "Naik, Avadhut" <avadnaik@....com>, "Mehta, Sohil"
	<sohil.mehta@...el.com>, "x86@...nel.org" <x86@...nel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yazen.ghannam@....com" <yazen.ghannam@....com>, Avadhut Naik
	<avadhut.naik@....com>
Subject: RE: [PATCH 2/2] x86/MCE: Add command line option to extend MCE
 Records pool

> Yeah, it is too static IMO. Especially if NR_CPUS is a build-time thing
> - needs to be based on the actual number of CPUs on the machine.
>
> BUT, we don't have an allocator yet.
>
> So we end up allocating it there on the heap.
>
> Unless we can do something with memblock...
>
> But then this still needs code audit whether num_possible_cpus() is
> final at that point. Because if it is, that would be the optimal thing
> to do a memblock_alloc() there...

I threw a printk() into mce_gen_pool_init() and got:

[    2.948285] mce: mce_gen_pool_init: num_possible_cpus = 144

So it is currently true that number of CPUs has been computed at this point.

So using memblock_alloc() based on number of CPUs may work

> > [Diff pasted into Outlook, chances that it will automatically apply = 0%]
>
> How you even do patches with outschmook is mindboggling :-)
>
> At least use Thunderbird. That's what I do for the company mail but then
> again I don't even try to do patches over company mail...

I use "git send-email" to send out patches, and usually "b4" to get them
to my desktop. I do have "mutt" on there, but IT have made it complex
for me to use it to simply read & reply. It requires separate mutt config
files to fetch mail and a different config to send mail because of the
firewall rules on the lab where my desktop lives.

-Tony