Kernel

[PATCH v2 0/5] mm/memcg: Reduce kmemcache memory accounting overhead (Waiman Long) https://lkml.kernel.org/r/20210412225503.15119-1-longman@redhat.com Recently introduced new slab memory controller eliminates the need for separate kmemcaches for each memory cgroup and therefore reduce kernel memory usage. However, it also increases memory accouning overhead in kmem cache alloc and free functions. This patchset reduces unnecessary local_irq_save() and local_irq_restore() sequences in the code path as much as possible for minimal overhead. [PATCH v7 0/7] Make alloc_contig_range handle Hugetlb pages (Oscar Salvador) https://lkml....

[RFC PATCH v1 00/11] Manage the top tier memory in a tiered memory (Tim Chen) https://lkml.kernel.org/r/cover.1617642417.git.tim.c.chen@linux.intel.com There are two patchsets for better handling of tiered-memory. [PATCH 00/10] [v7] Migrate Pages in lieu of discard (https://lore.kernel.org/linux-mm/20210401183216.443C4443@viggo.jf.intel.com/) makes cold pages to be placed in PMEM instead of DRAM, and [PATCH 0/6] [RFC v6] NUMA balancing: optimize memory placement for memory tiering system (https://lore.kernel.org/linux-mm/20210311081821.138467-1-ying.huang@intel.com/) allows hot pages to be placed in DRAM instead of PMEM....

[RFC] NUMA balancing: reduce TLB flush via delaying mapping on hint page fault (Huang Ying) https://lkml.kernel.org/r/20210329062651.2487905-1-ying.huang@intel.com NUMA balancing shots down TLBs on all CPUs that recently run hint-faulted process during the migration of the hint-faulted page to appropriate node. This commit delays the TLB shootdown to reduce the overhead. With pmbench, it reduced TLB shooting IPI up to 99%, though it didn’t makde visible benchmark score changes. [RFC v2 00/43] PKRAM: Preserved-over-Kexec RAM (Anthony Yznaga) https://lkml....

[PATCH 0/3 v5] Introduce a bulk order-0 page allocator (Mel Gorman) https://lkml.kernel.org/r/20210322091845.16437-1-mgorman@techsingularity.net Fifth version of the order-0 pages bulk allocator. In this version, the API users are dropped from the patchset, because the callers are not confirmed if they prefer an array or list interface. [PATCH] mm: cma: add trace events for CMA alloc perf testing (Georgi Djakov) https://lkml.kernel.org/r/20210324160740.15901-1-georgi.djakov@linaro.org This patch adds tracepoints for CMA and page migrations. Those aims to be used for performance debugging of CMA....

File THP and HWPoison (Matthew Wilcox) https://lkml.kernel.org/r/20210316140947.GA3420@casper.infradead.org THP is not splitted for file-backed pages when it got memory failure. This mail describes the problem in detail and propose some change to mitigate it. Issue with kfence and kmemleak (Luis Henriques) https://lkml.kernel.org/r/YFDf6iKH1p/jGnM0@suse.de Luis found a problem when kmemleak and kfence is used together. A fix is made by Marco. [PATCH v4 00/13] Introduced multi-preference mempolicy (Feng Tang) https://lkml.kernel.org/r/1615952410-36895-1-git-send-email-feng.tang@intel.com This is the fourth version of the patchset....