On Thu, 17 Aug 2017 18:20:17 -0700 Shakeel Butt <shakeelb@xxxxxxxxxx> wrote: > +linux-mm, linux-kernel > > On Thu, Aug 17, 2017 at 6:10 PM, Shakeel Butt <shakeelb@xxxxxxxxxx> wrote: > > The fadvise() manpage is silent on fadvise()'s effect on > > memory-based filesystems (shmem, hugetlbfs & ramfs) and pseudo > > file systems (procfs, sysfs, kernfs). The current implementaion > > of fadvise is mostly a noop for such filesystems except for > > FADV_DONTNEED which will trigger expensive remote LRU cache > > draining. This patch makes the noop of fadvise() on such file > > systems very explicit. > > > > However this change has two side effects for ramfs and one for > > tmpfs. First fadvise(FADV_DONTNEED) can remove the unmapped clean > > zero'ed pages of ramfs (allocated through read, readahead & read > > fault) and tmpfs (allocated through read fault). Also > > fadvise(FADV_WILLNEED) on create such clean zero'ed pages for > > ramfs. That sentence makes no sense. I assume "fadvise(FADV_WILLNEED) will create"? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
