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Date: Tue, 6 Nov 2018 13:05:11 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: jeyu@...nel.org, willy@...radead.org, tglx@...utronix.de,
mingo@...hat.com, hpa@...or.com, x86@...nel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com, daniel@...earbox.net,
jannh@...gle.com, keescook@...omium.org, kristen@...ux.intel.com,
dave.hansen@...el.com, arjan@...ux.intel.com
Subject: Re: [PATCH v8 1/4] vmalloc: Add __vmalloc_node_try_addr function
On Fri, 2 Nov 2018 12:25:17 -0700 Rick Edgecombe <rick.p.edgecombe@...el.com> wrote:
> Create __vmalloc_node_try_addr function that tries to allocate at a specific
> address without triggering any lazy purging. In order to support this behavior
> a try_addr argument was plugged into several of the static helpers.
Please explain (in the changelog) why lazy purging is considered to be
a problem. Preferably with some form of measurements, or at least a
hand-wavy guesstimate of the cost.
> This also changes logic in __get_vm_area_node to be faster in cases where
> allocations fail due to no space, which is a lot more common when trying
> specific addresses.
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