lkml.org 
[lkml]   [2022]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v8 4/4] mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl
On Wed, 13 Apr 2022 22:47:48 +0800 Muchun Song <songmuchun@bytedance.com> wrote:

> We must add hugetlb_free_vmemmap=on (or "off") to the boot cmdline and
> reboot the server to enable or disable the feature of optimizing vmemmap
> pages associated with HugeTLB pages. However, rebooting usually takes a
> long time. So add a sysctl to enable or disable the feature at runtime
> without rebooting.

Do we really need this feature? Really? What's the use case and what
is the end-user value?

Presumably CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP worsens things for some
setups/workloads? Please tell us much more about that. What is the
magnitude of the deoptimization?

\
 
 \ /
  Last update: 2022-04-13 21:14    [W:0.185 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site