Messages in this thread |  | | Date | Sat, 22 Dec 2001 00:01:31 +0100 | | From | Michael Marxmeier <> | | Subject | Question on sys_readahead() |
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I have a question on sys_readahead and would appreciate some hint or a pointer.
- When was this call added?
- As far as i understand the code it reads the data into the page cache. The data is ready sync and there is no way to do this async and have a notification unless using a separate thread.
A typical use i could see is preloading some data in the page cache from a separate thread (eg. for a media player).
BTW: AFAICS the code is off by one if offset/count is not in PAGE_SIZE chunks?
unsigned long start = offset >> PAGE_CACHE_SHIFT; unsigned long len = (count + ((long)offset & ~PAGE_CACHE_MASK)) >> PAGE_CACHE_SHIFT;
Thanks Michael
-- Michael Marxmeier Marxmeier Software AG E-Mail: mike@marxmeier.com Besenbruchstrasse 9 Phone : +49 202 2431440 42285 Wuppertal, Germany Fax : +49 202 2431420 http://www.marxmeier.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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