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On Sat, Feb 07, 2004 at 12:55:05AM -0800, Andrew Morton wrote: > Tim Hockin <thockin@sun.com> wrote: > > > > Attached is a patch to raise the limit of anonymous block devices. The > > sysctl allows the admin to set the order of pages allocated for the unnamed > > bitmap from 1 page to the full MINORBITS limit. > > It would be better to lose the sysctl and do it all dynamically. > > Options are: > > a) realloc the bitmap when it fills up > > Simple, a bit crufty, doesn't release memory. > > b) lib/radix-tree.c > > Each entry in the radix tree can be a bitmap (radix-tree.c should > have been defined to store unsigned longs, not void*'s. Oh well), so > you get good space utilisation, but finding a new entry will take ten or > so lines of code. > > c) lib/idr.c > > Worst space utilisation, but simplest code. d) grab a couple of pages and be done with that. That gives us 64Kbits. e) grab max(1/8000 of entire memory, 128Kb). That will guarantee that we run out of memory or minors before we fill the bitmap. PS: psu.edu address is still valid, but I rarely read that mailbox... - 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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