Hello Kenny, On Wed, May 21, 2014 at 5:15 AM, Kenny Simpson <theonetruekenny@xxxxxxxxx> wrote: > http://man7.org/linux/man-pages/man2/remap_file_pages.2.html > > makes no mention of the restriction against disk-based files with this > system call. > >> On Mon, May 19, 2014 at 5:24 PM, Kirill A. Shutemov >> <kirill@xxxxxxxxxxxxx> wrote: >>> On Mon, May 19, 2014 at 01:34:05PM -0400, Kenny Simpson wrote: >>>> For the other cases I had used the remapping to have more of a sliding >>>> window over a disk-backed file where I also was using aliasing to >>>> eliminate the corner cases of hitting the end of a window and needing >>>> to split records due to crossing boundaries, etc.. >>> >>> Disk backed files are not supported by remap_file_pages() since 2007. >>> See commit 3ee6dafc677a. Thanks for your note. Others recently also pointed this out, and the next release of man-pages will address this. Currently waiting in Gt is this text: NOTES Since Linux 2.6.23, remap_file_pages() creates non-linear mappings only on in-memory file systems such as tmpfs, hugetlbfs or ramfs. On filesystems with a backing store, remap_file_pages() is not much more efficient than using mmap(2) to adjust which parts of the file are mapped to which addresses. And there may yet be more tweaks to that text. Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
