Messages in this thread | | | Date | Wed, 6 Mar 2002 17:04:13 -0700 | From | Richard Gooch <> | Subject | Re: [RFC] Arch option to touch newly allocated pages |
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David Woodhouse writes: > > jdike@karaya.com said: > > Yeah, MADV_DONTNEED looks right. UML and Linux/s390 (assuming VM has > > the equivalent of MADV_DONTNEED) would need a hook in free_pages to > > make that happen. > > MADV_DONTNEED > Do not expect access in the near future. (For the > time being, the application is finished with the > given range, so the kernel can free resources asso > ciated with it.) > > It's not clear from that that the host kernel is actually permitted to > discard the data. > > alan@lxorguk.ukuu.org.uk said: > > VM allows you to give it back a page and if you use it again you get > > a clean copy. What it seems to lack is the more ideal "here have this > > page and if I reuse it trap if you did throw it out" semantic. > > I've wittered on occasion about other situations where such > semantics might be useful -- essentially 'drop these pages if you > need to as if they were clean, and tell me when I next touch them so > I can recreate their data'.
Indeed. I'd love such a feature. It's got applications in numerical/scientific code, not just UML.
Regards,
Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - 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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