Messages in this thread | | | Subject | Re: [RFC PATCH 0/3] Cgroup accounting of memory tier usage | From | Ying Huang <> | Date | Wed, 15 Jun 2022 12:58:50 +0800 |
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On Tue, 2022-06-14 at 15:25 -0700, Tim Chen wrote: > For controlling usage of a top tiered memory by a cgroup, accounting > of top tier memory usage is needed. This patch set implements the > following: > > Patch 1 introduces interface and simple implementation to retrieve > cgroup tiered memory usage > Patch 2 introduces more efficient accounting with top tier memory page counter > Patch 3 provides a sysfs interface to repot the the top tiered memory > usage. > > The patchset works with Aneesh's v6 memory-tiering implementation [1]. > It is a preparatory patch set before introducing features to > control top tiered memory in cgroups. > > I'll like to first get feedback to see if > (1) Controllng the topmost tiered memory is enough > or > (2) Multiple tiers at the top levels need to be grouped into "toptier" > or
If we combine top-N tiers, I think the better name could be "fast-tier", in contrast to "slow-tier".
> (3) There are use cases not covered by (1) and (2).
Is it necessary to control memory usage of each tier (except the lowest/slowest)? I am not the right person to answer the question, but I want to ask it.
Best Regards, Huang, Ying
> Thanks. > > Tim > > [1] https://lore.kernel.org/linux-mm/20220610135229.182859-1-aneesh.kumar@linux.ibm.com/ > > Tim Chen (3): > mm/memory-tiers Add functions for tier memory usage in a cgroup > mm/memory-tiers: Use page counter to track toptier memory usage > mm/memory-tiers: Show toptier memory usage for cgroup > > include/linux/memcontrol.h | 1 + > include/linux/memory-tiers.h | 2 + > mm/memcontrol.c | 86 +++++++++++++++++++++++++++++++++++- > mm/memory-tiers.c | 3 +- > 4 files changed, 89 insertions(+), 3 deletions(-) >
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