On 9 September 2013 04:23, Pádraig Brady <P@xxxxxxxxxxxxxx> wrote: > On 09/08/2013 05:09 PM, Sami Kerola wrote: >> +#ifdef POSIX_FADV_NOREUSE >> + posix_fadvise(fd, 0, lseek(fd, 0, 0), POSIX_FADV_NOREUSE); >> +#endif > > I don't follow. The above is saying to NOREUSE the data > from the start to the current position? > But won't the file be empty and the current position == 0 here? > Also POSIX_FADV_NOREUSE currently does nothing in the kernel. > There is POSIX_FADV_DONTNEED to drop the file (range) from cache. > But I'm not sure that's appropriate or needed for all temp files? > Note also DONTNEED is auto done when a file is unlinked. Hi Pádraig, I misunderstood posix_fadvice() manual page. Thank you for explaining how caching instructions work. Perhaps adding a note to posix_fadvise(3P) about unlinking and DONOTNEED would be appropriate. That, after all, makes manual fiddling with this function pointless in cases like I proposed. -- Sami Kerola http://www.iki.fi/kerolasa/ -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
