Messages in this thread | | | Date | Mon, 27 Mar 2006 13:10:49 -0800 | From | Andrew Morton <> | Subject | Re: [Ext2-devel] [PATCH 2/2] ext2/3: Support2^32-1blocks(e2fsprogs) |
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Mingming Cao <cmm@us.ibm.com> wrote: > > I am wondering if we have (or plan to have) "long long " type of percpu > counters? Andrew, Kiran, do you know? > > It seems right now the percpu counters are used mostly by ext2/3 for > filesystem free blocks accounting. Right now the counter is "long" type, > which is not enough if we want to extend the filesystem limit from 2**31 > to 2**32 on 32 bit machine. > > The patch from Takashi copies the whole percpu_count.h and create a new > percpu_llcounter.h to support longlong type percpu counters. I am > wondering is there any better way for this? >
I can't immediately think of anything smarter.
One could of course implement a 64-bit percpu counter by simply concatenating two 32-bit counters. That would be a little less efficient, but would introduce less source code and would mean that we don't need to keep two different implemetations in sync. But one would need to do a bit of implementation, see how bad it looks. - 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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