Messages in this thread | | | Date | Tue, 19 Aug 2003 07:32:11 -0600 | From | Erik Andersen <> | Subject | Re: cache limit |
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On Mon Aug 18, 2003 at 11:20:24PM -0700, Andrew Morton wrote: > Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua> wrote: > > > > There was a discussion (and patches) in the middle of 2.5 series > > about O_STREAMING open flag which mean "do not aggressively cache > > this file". Targeted at MP3/video playing, copying large files and such. > > > > I don't know whether it actually was merged. If it was, > > your program can use it. > > It was not. Instead we have fadvise. So it would be appropriate to change > applications such as rsync to optionally run > > posix_fadvise(fd, 0, -1, POSIX_FADV_DONTNEED) > > against file descriptors just before closing them, so all the pagecache > gets thrown away. (Well, most of the pagecache - dirty pages won't get > dropped - the app must fsync the files by hand first if it wants this)
This is not supported in 2.4.x though, right?
What if I don't want to fill up the pagecache with garbage in the first place? When closing a file descriptor, it is already too late -- the one time only giant pile of data has already caused the kernel to wastefully flush useful things out of cache...
-Erik
-- Erik B. Andersen http://codepoet-consulting.com/ --This message was written using 73% post-consumer electrons-- - 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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