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Hi Bill, > Very true. I devised something to address this that appears to work on > multiple architectures already by folding ->zone into ->flags, which > could be useful. (Dave Jones recommended I just let arch maintainers > for things other than i386 mess with page_address() for other arches.) > OTOH, I'm more interested in getting it trimmed down than getting credit. For archs that need ->zone, merging it with ->flags sounds like a great idea. Id like to cram something into ->flags on 64 bit archs since its only a long due to bitop constraints. I had thought of stuffing ->count in the high word but now Im just getting silly since all non atomic accesses to ->flags would then have to be word ones. > My i386 version, which makes ->virtual conditional on CONFIG_HIGHMEM as > well, is at: Id like to do redo some profiling, on ppc64 we had page_address() doing pointer arithmetic (instead of page->virtual) and the compiler created an awful sequence of instructions in the acenic interrupt handler. A zero copy TCP benchmark made it rather obvious. Anton - 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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