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Date: Mon, 10 Sep 2018 20:02:05 -0600 From: Shuah Khan <shuah@...nel.org> To: Michal Hocko <mhocko@...nel.org> Cc: Will Deacon <will.deacon@....com>, catalin.marinas@....com, sudeep.holla@....com, ganapatrao.kulkarni@...ium.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org> Subject: Re: [PATCH] arm64: add NUMA emulation support Hi Michal, On 09/10/2018 07:48 AM, Michal Hocko wrote: > On Fri 07-09-18 16:30:59, Shuah Khan wrote: >> On 09/07/2018 02:34 AM, Michal Hocko wrote: >>> On Thu 06-09-18 15:53:34, Shuah Khan wrote: [....] >> >> In addition to isolation, being able to reserve a block instead is one of the >> issues I am looking to address. Unfortunately memory cgroups won't address that >> issue. > > Could you be more specific why you need reservations other than > isolation. > Taking automotive as a specific example, there are two classes of applications: 1. critical applications that must run 2. Infotainment and misc. user-space. In this case, being able to reserve a block of memory for critical applications will ensure the memory is available for them. If a critical application has to restart and/or when an on-demand critical application starts, it might not be able to allocate memory if it is not reserved. When a flat system has multiple memory blocks, with NUMA emulation in conjunction with cpusets, one or more block can be reserved for critical applications configuring a set of cpus and one of more memory nodes for them. Memory cgroups will not support such reservation. Hope this helps explain the use-case I am trying to address with this patch. thanks, -- Shuah
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