Download/kernel/rhel6/042stab068.8/changes

Changes

Since 042stab065.3:

• [mm] possible memory corruption has been fixed by preventing reclaiming of pages in the writeback (PSBM-16442)
• [ploop] possible deadlock on destroying map has been fixed (PSBM-16627)
• [ubc/mm] A new strict page cache isolation feature (PSBM-16955, see Page cache isolation)
• [mm] per-bc pagecache should be shrinked proportionally now (PSBM-15799)
• [mm] debug trace events has been added into shrink_zone and shrink_gang
• [dcache] introduce per-bc dcache lru lists with real time shrink. Underlying dcache can be immediately shrunk if sysctl "ubc.dcache_no_vzfs_cache" is set (PSBM-16072)
• [vSwap] virtual vSwap feature has been introduced => now vSwap does not require free physical swap on the HN (PSBM-16764)
• [pagecache] enhanced version of memory scheduler: shadow gangs, reclaimer takes timestamps into the consideration, etc. (PSBM-15796)
  • vmscan priority is calculated for all LRU vectors according to its memory usage/limit and age of LRU lists.
  • sysctls:
    • vm.usage_factor (default 2)
    • vm.shadow_factor (default 8)
    • vm.age_factor (default 8)
    • priority = 12 + usage * usage_factor / limit + shadow * shadow_factor / limit (for shadow part only) + age * age_factor / max_age
• [ubc/dcache] fix endless oom postponing in dcache reclaimer (PSBM-17067, PSBM-17069)
• [mm] the number of vmscan prios has been increased from 25 to 42. vmscan iterator has been fixed. (PSBM-15799)
• [cpt] kernel panic has been fixed due to DEAD task restoration attempt (PCLIN-30483, PSBM-17107)
• [mm] deadlock in kswapd near oom condition has been fixed (PSBM-17100)
• [devpts] handle dentry allocation failure properly in devpts_pty_new() (#1758)