Messages in this thread | | | Date | Wed, 09 Oct 2002 01:43:35 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] O_STREAMING - flag for optimal streaming I/O |
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Giuliano Pochini wrote: > > > The point of O_STREAMING is one change: drop pages in the pagecache > > behind our current position, that are free-able, because we know we will > > never want them. > > Does it drop pages unconditionally ?
Yup.
> What happens if I do a > streaming_cat largedatabase > /dev/null while other processes > are working on it ?
You'll make your database run really slowly.
> It's not a good thing to remove the whole > cached data other apps are working on. >
Don't do that then ;)
Seriously, there are tons of ways of creating local performance DoS'es of this form. fsync is an excellent tool for that. - 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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