From c3ada46a009001e144b29736880962f24ee2afdf Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Tue, 20 Nov 2007 18:09:59 -0200 Subject: [CCID3]: Inline for moving average The moving average computation occurs so frequently in the CCID 3 code that it merits an inline function of its own. This is uses a suggestion by Arnaldo as per http://www.mail-archive.com/dccp@vger.kernel.org/msg01662.html Signed-off-by: Gerrit Renker Signed-off-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/ccids/lib/tfrc.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'net/dccp/ccids/lib/tfrc.h') diff --git a/net/dccp/ccids/lib/tfrc.h b/net/dccp/ccids/lib/tfrc.h index faf5f7e219e3..5a0ba86df183 100644 --- a/net/dccp/ccids/lib/tfrc.h +++ b/net/dccp/ccids/lib/tfrc.h @@ -37,6 +37,15 @@ static inline u32 scaled_div32(u64 a, u32 b) return result; } +/** + * tfrc_ewma - Exponentially weighted moving average + * @weight: Weight to be used as damping factor, in units of 1/10 + */ +static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight) +{ + return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval; +} + extern u32 tfrc_calc_x(u16 s, u32 R, u32 p); extern u32 tfrc_calc_x_reverse_lookup(u32 fvalue); -- cgit v1.2.3