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authorPaolo Valente <paolo.valente@unimore.it>2013-07-10 15:46:08 +0200
committerDavid S. Miller <davem@davemloft.net>2013-07-11 13:01:07 -0700
commit87f1369d6e2e820c77cf9eac542eed4dcf036f64 (patch)
tree65cbaa15e9378cc680aa2db5b00d99abdfea1a61 /MAINTAINERS
parentcdbaa0bb26d8116d00be24e6b49043777b382f3a (diff)
pkt_sched: sch_qfq: improve efficiency of make_eligible
In make_eligible, a mask is used to decide which groups must become eligible: the i-th group becomes eligible only if the i-th bit of the mask (from the right) is set. The mask is computed by left-shifting a 1 by a given number of places, and decrementing the result. The shift is performed on a ULL to avoid problems in case the number of places to shift is higher than 31. On a 32-bit machine, this is more costly than working on an UL. This patch replaces such a costly operation with two cheaper branches. The trick is based on the following fact: in case of a shift of at least 32 places, the resulting mask has at least the 32 less significant bits set, whereas the total number of groups is lower than 32. As a consequence, in this case it is enough to just set the 32 less significant bits of the mask with a cheaper ~0UL. In the other case, the shift can be safely performed on a UL. Reported-by: David S. Miller <davem@davemloft.net> Reported-by: David Laight <David.Laight@ACULAB.COM> Signed-off-by: Paolo Valente <paolo.valente@unimore.it> Signed-off-by: David S. Miller <davem@davemloft.net>
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