Kernel

[RFC PATCH] Introducing lockless cache built on top of slab allocator (Hyeonggon Yoo) https://lkml.kernel.org/r/20210919164239.49905-1-42.hyeyoo@gmail.com The block layer now has a lockless cache, which increased its IOPS. This RFC generalizes it so that it can be used in some other area, such as NAPI. [PATCH v5 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem (David Hildenbrand) https://lkml.kernel.org/r/20210920142856.17758-1-david@redhat.com This patchset makes a basic infrastructure to exclude some physical memory regions that marked as IORESOURCE_SYSTEM_RAM from /dev/mem access, even though they are not marked as IORESOURCE_BUSY....

[PATCH v1] vmpressure: wake up work only when there is registration event (wangyong) https://lkml.kernel.org/r/1631548441-2784-1-git-send-email-wang.yong12@zte.com.cn Currently, vmpressure works are awaken even though there are no vmpressure callbacks. This commit avoids such unnecessary wakeup by counting the number of registered events and skip waking up works if the number is zero. [PATCH v3 00/76] Optimize list lru memory consumption (Muchun Song) https://lkml.kernel.org/r/20210914072938.6440-1-songmuchun@bytedance.com Muchun found kmalloc-32 for list_lru_one allocation consuming 6 GiB of memory on their server....

[RFC PATCH] mm/oom: detect and kill task which has allocation forbidden by cpuset limit (Feng Tang) https://lkml.kernel.org/r/1630399085-70431-1-git-send-email-feng.tang@intel.com Docker needs to allocate memory in non-movable zones for creation of an OS (e.g., GFP_HIGHUSER). However, if it is binded to a cpuset which has only movable zone, the allocation fails and OOM storm attacks other innocent processes. This patch detects the case and kill only the allocation failing process. Folios: Can we resolve this please?...

[GIT PULL] Memory folios for v5.15 (Matthew Wilcox) https://lkml.kernel.org/r/YSPwmNNuuQhXNToQ@casper.infradead.org Matthew Wilcox sent a pull request for his page folio works to Linus Torvalds. Linus Torvalds replied he wants this to work in reverse. That is, calling head pages as normal pages but calling tail pages something other, as the term, page, is more common and de-facto standard in the industry. mmotm 2021-08-23-16-42 uploaded (Andrew Morton) https://lkml.kernel.org/r/20210823234329.H9WD-du1K%akpm@linux-foundation.org MMOTM is rebased on v5....

[PATCH v2 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem (David Hildenbrand) https://lkml.kernel.org/r/20210816142505.28359-1-david@redhat.com Once the virtio-mem driver is plugging/unplugging memory of virtual machines, accessing the memory region via /dev/mem from the user space makes no sense. To avoid such insane use case, this patchset adds a basic infrastructure to exclude some physical memory regions completely from /dev/mem. [PATCH v2 00/61] Introducing the Maple Tree (Liam Howlett) https://lkml.kernel.org/r/20210817154651.1570984-1-Liam.Howlett@oracle.com This patchset introduces a new data structure called maple tree, which intended to replace the rbtree for vm_area_struct....