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alloc: Optimize find_free_usf 

According to callgrind, this function consumes 33% CPU when running
the AllocTest program.

This commit uses the assigned_usf() method to get the USFs allocated
by a PDCH instead of traversing the TBFs.

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2015-06-30 14:34:24 +02:00
parent cc9358f95a
commit 20b7ba7501
1 changed files with 4 additions and 9 deletions
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13
src/gprs_rlcmac_ts_alloc.cpp
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@ -115,17 +115,12 @@ static bool test_and_set_bit(uint32_t *bits, size_t elem)
static inline int8_t find_free_usf(struct gprs_rlcmac_pdch *pdch)
{
struct gprs_rlcmac_ul_tbf *tbf;
uint8_t usf_map = 0;
uint8_t tfi, usf;
uint8_t usf;
/* make map of used USF */
for (tfi = 0; tfi < 32; tfi++) {
tbf = pdch->ul_tbf_by_tfi(tfi);
if (!tbf)
continue;
usf_map |= (1 << tbf->m_usf[pdch->ts_no]);
}
usf_map = pdch->assigned_usf();
if (usf_map == (1 << 7) - 1)
return -1;
/* look for USF, don't use USF=7 */
for (usf = 0; usf < 7; usf++) {