On 2018-11-07 05:52, Andrew Morton wrote:
On Fri, 26 Oct 2018 16:30:58 +0530 Arun KS <arunks@xxxxxxxxxxxxxx>
wrote:
This series convert totalram_pages, totalhigh_pages and
zone->managed_pages to atomic variables.
The whole point appears to be removal of managed_page_count_lock, yes?
Why? What is the value of this patchset? If "performance" then are
any
measurements available?
Hello Andrew,
https://patchwork.kernel.org/patch/10670787/
In version 2, I have added motivation behind this conversion. Pasting
same here,
totalram_pages, zone->managed_pages and totalhigh_pages updates are
protected by managed_page_count_lock, but readers never care about it.
Convert these variables to atomic to avoid readers potentially seeing a
store tear. I don't think we have a performance improvement here.
Regards,
Arun
