linux-kernel - Re: [PATCH 12/17] Kbuild, lto: Set TMPDIR for LTO

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Message-ID: <52FD9B0A.8030309@zytor.com>
Date:	Thu, 13 Feb 2014 20:26:50 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
CC:	linux-kbuild@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 12/17] Kbuild, lto: Set TMPDIR for LTO

On 02/08/2014 12:01 AM, Andi Kleen wrote:
> LTO gcc puts a lot of data into $TMPDIR, essentially another copy
> of the object directory to pass the repartitioned object files
> to the code generation processes.
> 
> TMPDIR defaults to /tmp With /tmp as tmpfs it's easy to drive systems to
> out of memory, because they will compete with the already high anonymous
> memory consumption of the wpa LTO pass.
> 
> When LTO is set always set TMPDIR to the object directory. This could
> be slightly slower, but is far safer and eliminates another parameter
> the LTO user would need to set manually.
> 
> I made it conditional on LTO for now.

I think this really ought to use ?= so it doesn't override a TMPDIR
explicitly set by the user.

	-hpa

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