Eric Dumazet 93aaae2e01 filter: optimize sk_run_filter ... Remove pc variable to avoid arithmetic to compute fentry at each filter instruction. Jumps directly manipulate fentry pointer. As the last instruction of filter[] is guaranteed to be a RETURN, and all jumps are before the last instruction, we dont need to check filter bounds (number of instructions in filter array) at each iteration, so we remove it from sk_run_filter() params. On x86_32 remove f_k var introduced in commit 57fe93b374 (filter: make sure filters dont read uninitialized memory) Note : We could use a CONFIG_ARCH_HAS_{FEW|MANY}_REGISTERS in order to avoid too many ifdefs in this code. This helps compiler to use cpu registers to hold fentry and A accumulator. On x86_32, this saves 401 bytes, and more important, sk_run_filter() runs much faster because less register pressure (One less conditional branch per BPF instruction) # size net/core/filter.o net/core/filter_pre.o text data bss dec hex filename 2948 0 0 2948 b84 net/core/filter.o 3349 0 0 3349 d15 net/core/filter_pre.o on x86_64 : # size net/core/filter.o net/core/filter_pre.o text data bss dec hex filename 5173 0 0 5173 1435 net/core/filter.o 5224 0 0 5224 1468 net/core/filter_pre.o Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2010-11-19 09:49:59 -08:00
..
isdn_audio.c	Update broken web addresses in the kernel.	2010-10-18 11:03:14 +02:00
isdn_audio.h
isdn_bsdcomp.c
isdn_common.c	isdn: autoconvert trivial BKL users to private mutex	2010-07-12 20:21:47 -07:00
isdn_common.h
isdn_concap.c	drivers/isdn/i4l: Remove unnecessary casts of netdev_priv	2010-11-17 10:36:50 -08:00
isdn_concap.h
isdn_net.c	drivers/isdn/i4l: Remove unnecessary casts of netdev_priv	2010-11-17 10:36:50 -08:00
isdn_net.h	isdn: fix possible circular locking dependency	2009-10-22 18:27:53 -07:00
isdn_ppp.c	filter: optimize sk_run_filter	2010-11-19 09:49:59 -08:00
isdn_ppp.h
isdn_tty.c	i4l: kill big kernel lock	2010-09-15 19:29:55 -07:00
isdn_tty.h
isdn_ttyfax.c	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
isdn_ttyfax.h
isdn_v110.c
isdn_v110.h
isdn_x25iface.c	X25: Use identifiers for isdn device to x25 interface	2010-04-22 16:12:48 -07:00
isdn_x25iface.h
isdnhdlc.c
Kconfig	isdn: fix a few Kconfig imperfections	2010-02-22 15:45:53 -08:00
Makefile