diff options
| author | Michal Soltys <soltys@ziu.info> | 2016-06-30 03:26:47 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-07-01 12:03:43 +0300 |
| commit | ab12cb4742cf608cfee43c84fe07fa56bd473dcb (patch) | |
| tree | 00a960cf56b56a0387e63af15e921ae0168bc6ef /net/sched | |
| parent | 2354f056f6847125a95b42732ab481730389c099 (diff) | |
| download | linux-ab12cb4742cf608cfee43c84fe07fa56bd473dcb.tar.xz | |
net/sched/sch_hfsc.c: go passive after vt update
When a class is going passive, it should update its cl_vt first
to be consistent with the last dequeue operation.
Otherwise its cl_vt will be one packet behind and parent's cvtmax might
not be updated as well.
One possible side effect is if some class goes passive and subsequently
goes active /without/ its parent going passive - with cl_vt lagging one
packet behind - comparison made in init_vf() will be affected (same
period).
Signed-off-by: Michal Soltys <soltys@ziu.info>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_hfsc.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index df07f060c0e9..4eef857bac4d 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -778,6 +778,20 @@ update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time) else go_passive = 0; + /* update vt */ + cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total) + - cl->cl_vtoff + cl->cl_vtadj; + + /* + * if vt of the class is smaller than cvtmin, + * the class was skipped in the past due to non-fit. + * if so, we need to adjust vtadj. + */ + if (cl->cl_vt < cl->cl_parent->cl_cvtmin) { + cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt; + cl->cl_vt = cl->cl_parent->cl_cvtmin; + } + if (go_passive) { /* no more active child, going passive */ @@ -794,25 +808,10 @@ update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time) continue; } - /* - * update vt and f - */ - cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total) - - cl->cl_vtoff + cl->cl_vtadj; - - /* - * if vt of the class is smaller than cvtmin, - * the class was skipped in the past due to non-fit. - * if so, we need to adjust vtadj. - */ - if (cl->cl_vt < cl->cl_parent->cl_cvtmin) { - cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt; - cl->cl_vt = cl->cl_parent->cl_cvtmin; - } - /* update the vt tree */ vttree_update(cl); + /* update f */ if (cl->cl_flags & HFSC_USC) { cl->cl_myf = cl->cl_myfadj + rtsc_y2x(&cl->cl_ulimit, cl->cl_total); |