linux-kernel - Re: [PATCH v6 0/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up

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Date: Thu, 20 Jun 2024 00:53:07 +0300
From: Mike Rapoport <rppt@...nel.org>
To: linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Cc: Mike Rapoport <rppt@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	suleiman@...gle.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Vineeth Pillai <vineeth@...byteword.org>,
	Youssef Esmat <youssefesmat@...gle.com>,
	Beau Belgrave <beaub@...ux.microsoft.com>,
	Alexander Graf <graf@...zon.com>,
	Baoquan He <bhe@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v6 0/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up

From: Mike Rapoport (IBM) <rppt@...nel.org>

On Thu, 13 Jun 2024 11:55:06 -0400, Steven Rostedt wrote:
> Reserve unspecified location of physical memory from kernel command line
> 
> Background:
> 
> In ChromeOS, we have 1 MB of pstore ramoops reserved so that we can extract
> dmesg output and some other information when a crash happens in the field.
> (This is only done when the user selects "Allow Google to collect data for
>  improving the system"). But there are cases when there's a bug that
> requires more data to be retrieved to figure out what is happening. We would
> like to increase the pstore size, either temporarily, or maybe even
> permanently. The pstore on these devices are at a fixed location in RAM (as
> the RAM is not cleared on soft reboots nor crashes). The location is chosen
> by the BIOS (coreboot) and passed to the kernel via ACPI tables on x86.
> There's a driver that queries for this to initialize the pstore for
> ChromeOS:
> 
> [...]

Applied to for-next branch of memblock.git tree, thanks!

[0/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up
      commit: 1e4c64b71c9bf230b25fde12cbcceacfdc8b3332
[1/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up
      commit: 1e4c64b71c9bf230b25fde12cbcceacfdc8b3332
[2/2] pstore/ramoops: Add ramoops.mem_name= command line option
      commit: d9d814eebb1ae9742e7fd7f39730653b16326bd4

tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock
branch: for-next

--
Sincerely yours,
Mike.