Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sun, 2 Nov 2003 15:47:34 +1100 | Subject | Re: [BLOCK] phys_contig implies hw_contig | From | Herbert Xu <> |
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On Sat, Nov 01, 2003 at 08:45:47PM -0800, David S. Miller wrote: > On Sat, 1 Nov 2003 13:31:27 +1100 > Herbert Xu <herbert@gondor.apana.org.au> wrote: > > > In ll_merge_requests_fn, it is checking blk_hw_contig_segments even if > > blk_phys_contig_segments succeeds. This means that it may cause two > > physically contiguous segments to be separated because the hw check > > fails. > > Your analysis assumes that phys contig implies hw contig, I > believe it does not. There may be limitations in the VMERGE > mechanism a platform implements that causes this situation to > arise.
OK, if that's the case, then we better change blk_recount_segments as it assumes this.
Cheers, -- Debian GNU/Linux 3.0 is out! ( http://www.debian.org/ ) Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - 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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