On Sun, Jan 23, 2005 at 12:40:42AM -0800, Andrew Morton wrote: > Matt Mackall <[EMAIL PROTECTED]> wrote: > > > > This set of patches introduces a new config option CONFIG_CORE_SMALL > > from the -tiny tree for small systems. This series should apply > > cleanly against 2.6.11-rc1-mm2. > > > > When selected, it enables various tweaks to miscellaneous core data > > structures to shrink their size on small systems. While each tweak is > > fairly small, in aggregate they can save a substantial amount of > > memory. > > You know what I'm going to ask ;) How much memory?
This stuff is mostly pretty small, a few K per patch. I think these 8 are about 40k total but my notes are several months old. > I wish it didn't have "core" in the name. A little misleading. Well I've got another set called NET_SMALL. BASE? > Did you think of making CONFIG_CORE_SMALL an integer which has values zero > or one? > > Then you can lose all those ifdefs: > > #define MAX_PROBE_HASH (255 - CONFIG_CORE_SMALL * 254) /* dorky */ Ew. > #define PID_MAX_DEFAULT (CONFIG_CORE_SMALL ? 0x1000 : 0x8000) > #define UIDHASH_BITS (CONFIG_CORE_SMALL ? 3 : 8) > #define FUTEX_HASHBITS (CONFIG_CORE_SMALL ? 4 : 8) > etc. Hmm. I think we'd want a hidden config variable for this and I'm not sure how well the config language allows setting an int from a bool. And then it would need another name. On the whole, seems more complex than what I've done. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
