On Tue, 17 Apr 2007 03:15:51 -0400 Rik van Riel <[EMAIL PROTECTED]> wrote:
> Make it possible for applications to have the kernel free memory > lazily. This reduces a repeated free/malloc cycle from freeing > pages and allocating them, to just marking them freeable. If the > application wants to reuse them before the kernel needs the memory, > not even a page fault will happen. > > This patch, together with Ulrich's glibc change, increases > MySQL sysbench performance by a factor of 2 on my quad core > test system. > In file included from include/linux/mman.h:4, from arch/sparc64/kernel/sys_sparc.c:19: include/asm/mman.h:36:1: "MADV_FREE" redefined In file included from include/asm/mman.h:5, from include/linux/mman.h:4, from arch/sparc64/kernel/sys_sparc.c:19: include/asm-generic/mman.h:32:1: this is the location of the previous definition sparc32 and sparc64 already defined MADV_FREE: #define MADV_FREE 0x5 /* (Solaris) contents can be freed */ I'll remove the sparc definitions for now, but we need to work out what we're going to do here. Your patch changes the values of MADV_FREE on sparc. Perhaps this should be renamed to MADV_FREE_LINUX and given a different number. It depends on how close your proposed behaviour is to Solaris's. - 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/