throtl_trim_slice

Name:Trim the used slices and adjust slice start accordingly

Proto:static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)

Type:void

Parameter:

Type	Parameter	Name
struct throtl_grp *	tg
bool	rw

842

BUG_ON(time_before(slice_end[rw], When did we start a new slice [rw]))

849

If Determine if previously allocated or extended slice is complete or not Then Return

860

throtl_set_slice_end(tg, rw, jiffies + throtl_slice)

862

time_elapsed = jiffies - When did we start a new slice [rw]

864

nr_slices = time_elapsed / throtl_slice

866

If Not nr_slices Then Return

868

tmp = tg_bps_limit(tg, rw) * throtl_slice * nr_slices

869

do_div() is NOT a C function(tmp, HZ)

870

bytes_trim = tmp

872

io_trim = tg_iops_limit(tg, rw) * throtl_slice * nr_slices / HZ

875

If Not bytes_trim && Not io_trim Then Return

878

If Number of bytes disptached in current slice [rw] >= bytes_trim Then Number of bytes disptached in current slice [rw] -= bytes_trim

880

Else Number of bytes disptached in current slice [rw] = 0

883

If Number of bio's dispatched in current slice [rw] >= io_trim Then Number of bio's dispatched in current slice [rw] -= io_trim

885

Else Number of bio's dispatched in current slice [rw] = 0

888

When did we start a new slice [rw] += nr_slices * throtl_slice

890

hrotl_log - log debug message via blktrace*@sq: the service_queue being reported*@fmt: printf format string*@args: printf args* The messages are prefixed with "throtl BLKG_NAME" if @sq belongs to a* throtl_grp; otherwise, just "throtl".( & this group's service queue , "[%c] trim slice nr=%lu bytes=%llu io=%lu start=%lu end=%lu jiffies=%lu", rw == generic data direction definitions ? 'R' : 'W', nr_slices, bytes_trim, io_trim, When did we start a new slice [rw], slice_end[rw], jiffies)

**Caller**
Name	Describe
tg_dispatch_one_bio
blk_throtl_bio

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