| commit | d7e883fdbf85067272b0d3279e56976cde73ff91 | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Fri, 28 Jun 2019 22:35:18 +0000 (28 15:35 -0700) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Fri, 28 Jun 2019 22:46:44 +0000 (28 15:46 -0700) | ||
| tree | 2bd86e49c5afd2cbaf0a636c78c44506ac9657f3 | treesnapshot (tar.gz zip) |
| parent | 733719bd9e10a6d1282245960209fcd8840ccae8 | commitdiff |
kernel - VM rework part 21 - Fix excessive paging to swap bug
* Fix a bug where pages on the inactive queue would sometimes not
get moved to the cache queue after being paged out, and also not
get its [M]odify bit cleared, causing the pageout demon to repeatedly
write numerous pages out without making progress.
This may require some additional work to avoid a double-pageout
condition, but it fixes the main issue.
* Returns us back to the 'feel' of paging prior to the VM rework,
and should reduce stuttering in chrome and other paging-related lag
users might experience.
The bug was introduced due to differences in how the pmap code
handle vm_page_protect(..., VM_PROT_READ).
* Fix a bug where pages on the inactive queue would sometimes not
get moved to the cache queue after being paged out, and also not
get its [M]odify bit cleared, causing the pageout demon to repeatedly
write numerous pages out without making progress.
This may require some additional work to avoid a double-pageout
condition, but it fixes the main issue.
* Returns us back to the 'feel' of paging prior to the VM rework,
and should reduce stuttering in chrome and other paging-related lag
users might experience.
The bug was introduced due to differences in how the pmap code
handle vm_page_protect(..., VM_PROT_READ).
| sys/vm/vm_pageout.c | diffblobblamehistory |