Messages in this thread | | | Date | Thu, 2 Sep 2004 20:02:12 -0400 (EDT) | From | Zwane Mwaikambo <> | Subject | [PATCH][0/8] Arch agnostic completely out of line locks |
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This patch achieves out of line spinlocks by creating kernel/spinlock.c and using the _raw_* inline locking functions. Now, as much as this is supposed to be arch agnostic, there was still a fair amount of rummaging about in archs, mostly for the cases where the arch already has out of line locks and i wanted to avoid the extra call, saving that extra call also makes lock profiling easier. PPC32/64 was an example of such an arch and i have added the necessary profile_pc() function as an example.
Size differences are with CONFIG_PREEMPT enabled since we wanted to determine how much could be saved by moving that lot out of line too.
ppc64 = 259897 bytes: text data bss dec hex filename 5489808 1962724 709064 8161596 7c893c vmlinux-after 5749577 1962852 709064 8421493 808075 vmlinux-before
sparc64 = 193368 bytes: text data bss dec hex filename 3472037 633712 308920 4414669 435ccd vmlinux-after 3665285 633832 308920 4608037 465025 vmlinux-before
i386 = 524115 bytes text data bss dec hex filename 5695619 870906 328112 6894637 69342d vmlinux-after 6221254 870634 326864 7418752 713380 vmlinux-before
x86-64 = 282446 bytes text data bss dec hex filename 4598025 1450644 523632 6572301 64490d vmlinux-after 4881679 1449436 523632 6854747 68985b vmlinux-before
It has been compile tested (UP, SMP, PREEMPT) on i386, x86-64, sparc, sparc64, ppc64, ppc32 and runtime tested on i386 and x86-64. I still have to get benchmarks done (most probably i386). The patch is currently against 2.6.9-rc1-mm1 because we'd have to back out the i386/x86_64 out of line lock patches since this does it in a different way, i can merge later on.
Thanks, Zwane - 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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