: On Tue, 26 Jun 2001 18:42:56 -0300 (BRST), Rik van Riel wrote:
>On Tue, 26 Jun 2001, John Stoffel wrote:
>
>> Or that we're doing big sequential reads of file(s) which are
>> larger than memory, in which case expanding the cache size buys
>> us nothing, and can actually hurt us alot.
>
>That's a big "OR". I think we should have an algorithm to
>see which of these two is the case, otherwise we're just
>making the wrong decision half of the time.
Windows NT/2000 has flags that can be for each CreateFile operation
("open" in Unix terms), for instance
FILE_ATTRIBUTE_TEMPORARY
FILE_FLAG_WRITE_THROUGH
FILE_FLAG_NO_BUFFERING
FILE_FLAG_RANDOM_ACCESS
FILE_FLAG_SEQUENTIAL_SCAN
If Linux does not have mechanism that would allow the signalling of
specific use case, it might be helpful to implement such a hinting system?
Disclaimer: I am clueless about what the kernel provides at this time.
-
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/
This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:15 EST