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Nick Piggin 35a82d1a53 [PATCH] optimise loop driver a bit ... Looks like locking can be optimised quite a lot. Increase lock widths slightly so lo_lock is taken fewer times per request. Also it was quite trivial to cover lo_pending with that lock, and remove the atomic requirement. This also makes memory ordering explicitly correct, which is nice (not that I particularly saw any mem ordering bugs). Test was reading 4 250MB files in parallel on ext2-on-tmpfs filesystem (1K block size, 4K page size). System is 2 socket Xeon with HT (4 thread). intel:/home/npiggin# umount /dev/loop0 ; mount /dev/loop0 /mnt/loop ; /usr/bin/time ./mtloop.sh Before: 0.24user 5.51system 0:02.84elapsed 202%CPU (0avgtext+0avgdata 0maxresident)k 0.19user 5.52system 0:02.88elapsed 198%CPU (0avgtext+0avgdata 0maxresident)k 0.19user 5.57system 0:02.89elapsed 198%CPU (0avgtext+0avgdata 0maxresident)k 0.22user 5.51system 0:02.90elapsed 197%CPU (0avgtext+0avgdata 0maxresident)k 0.19user 5.44system 0:02.91elapsed 193%CPU (0avgtext+0avgdata 0maxresident)k After: 0.07user 2.34system 0:01.68elapsed 143%CPU (0avgtext+0avgdata 0maxresident)k 0.06user 2.37system 0:01.68elapsed 144%CPU (0avgtext+0avgdata 0maxresident)k 0.06user 2.39system 0:01.68elapsed 145%CPU (0avgtext+0avgdata 0maxresident)k 0.06user 2.36system 0:01.68elapsed 144%CPU (0avgtext+0avgdata 0maxresident)k 0.06user 2.42system 0:01.68elapsed 147%CPU (0avgtext+0avgdata 0maxresident)k Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		20 years ago
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acpi	Linux-2.6.12-rc2	20 years ago
asm-alpha	[PATCH] remove non-DISCONTIG use of pgdat->node_mem_map	20 years ago
asm-arm	Merge master.kernel.org:/home/rmk/linux-2.6-arm	20 years ago
asm-arm26	[PATCH] Remove obsolete HAVE_ARCH_GET_SIGNAL_TO_DELIVER?	20 years ago
asm-cris	[PATCH] asm/signal.h unification	20 years ago
asm-frv	[PATCH] asm/signal.h unification	20 years ago
asm-generic	[PATCH] x86/x86_64: pcibus_to_node	20 years ago
asm-h8300	[PATCH] h8300 build error fix	20 years ago
asm-i386	[PATCH] xen: x86: Rename usermode macro	20 years ago
asm-ia64	[PATCH] ia64: Selectable Timer Interrupt Frequency	20 years ago
asm-m32r	[PATCH] m32r: build fix for asm-m32r/topology.h	20 years ago
asm-m68k	[PATCH] asm/signal.h unification	20 years ago
asm-m68knommu	[PATCH] asm/signal.h unification	20 years ago
asm-mips	[PATCH] mips: add vr41xx gpio support	20 years ago
asm-parisc	[PATCH] remove non-DISCONTIG use of pgdat->node_mem_map	20 years ago
asm-ppc	[PATCH] ppc32: Clean up NUM_TLBCAMS usage for Freescale Book-E PPC's	20 years ago
asm-ppc64	[PATCH] ppc64: pcibus_to_node fix	20 years ago
asm-s390	[PATCH] smp_processor_id() cleanup	20 years ago
asm-sh	[PATCH] Hugepage consolidation	20 years ago
asm-sh64	…
asm-sparc	…
asm-sparc64	[PATCH] Hugepage consolidation	20 years ago
asm-um	[PATCH] smp_processor_id() cleanup	20 years ago
asm-v850	[PATCH] asm/signal.h unification	20 years ago
asm-x86_64	[PATCH] xen: x86_64: Add macro for debugreg	20 years ago
linux	[PATCH] optimise loop driver a bit	20 years ago
math-emu	…
media	…
mtd	Linux-2.6.12-rc2	20 years ago
net	[X25]: Fast select with no restriction on response	20 years ago
pcmcia	…
rxrpc	Linux-2.6.12-rc2	20 years ago
scsi	Automatic merge of ../scsi-misc-2.6-old/	20 years ago
sound	[PATCH] create a kstrdup library function	20 years ago
video	…