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
..
act2000	isdn: Free irq_data namespace	2010-10-04 11:00:55 +02:00
capi	convert get_sb_single() users	2010-10-29 04:16:28 -04:00
divert	isdn: potential buffer overflows	2010-09-06 18:29:18 -07:00
gigaset	isdn/gigaset: improve bas_gigaset USB error reporting	2010-10-01 00:33:37 -07:00
hardware	drivers/isdn: Remove unnecessary semicolons	2010-11-15 11:06:17 -08:00
hisax	drivers/isdn/hisax: Add printf format/argument verification and fix fallout	2010-11-17 10:58:22 -08:00
hysdn	drivers: isdn: remove custom strtoul()	2010-07-15 19:05:25 -07:00
i4l	filter: optimize sk_run_filter	2010-11-19 09:49:59 -08:00
icn	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
isdnloop	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
mISDN	drivers/isdn/mISDN: Use printf extension %pV	2010-11-16 10:22:58 -08:00
pcbit	drivers/isdn: Use static const char * const where possible	2010-09-14 20:22:02 -07:00
sc	isdn: strcpy() => strlcpy()	2010-10-08 10:21:22 -07:00
Kconfig	isdn: fix a few Kconfig imperfections	2010-02-22 15:45:53 -08:00
Makefile