On 05/11/2011 07:47 PM, JD wrote: > On 05/11/11 11:19, Alain Spineux wrote: >> Hello I have a file, that is an index, it is open all the time by the >> application, >> but sometime the access are slow because the file was moved out of the cache. >> >> How can I keep it in memory all the time ? >> I can read it at regular interval, but this is a little over kill ? >> >> Any idea >> >> thanks. >> >> > There is a kernel facility that nails pages to memory so that > they are not paged out (such as for DMA purposes). > But I do not know if such a facility is accessible directly from > any userland calls via libc. > BSD used to have a vadvise() call to accomplish such a feat. > Linux has the madvise/posix_madvise calls. But madvise and friends are just that - advisory. The kernel is free to ignore the advice if it likes. If you need guarantees you want mlock/mlockall. Regards, Bryn. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
