Function report |
Source Code:block\blk-iolatency.c |
Create Date:2022-07-28 17:45:14 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
home page | Tree |
Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:We scale the qd down faster than we scale up, so we need to use this helper* to adjust the scale_cookie accordingly so we don't prematurely get* scale_cookie at DEFAULT_SCALE_COOKIE and unthrottle too much
Proto:static void scale_cookie_change(struct blk_iolatency *blkiolat, struct child_latency_info *lat_info, bool up)
Type:void
Parameter:
Type | Parameter | Name |
---|---|---|
struct blk_iolatency * | blkiolat | |
struct child_latency_info * | lat_info | |
bool | up |
327 | qd = Max # of requests |
328 | scale = scale_amount(qd, up) |
331 | diff = 0 |
333 | If old < DEFAULT_SCALE_COOKIE Then diff = DEFAULT_SCALE_COOKIE - old |
336 | If up Then |
337 | If scale + old > DEFAULT_SCALE_COOKIE Then atomic_set( & Cookie to tell if we need to scale up or down. , DEFAULT_SCALE_COOKIE) |
340 | Else if diff > qd Then atomic_inc( & Cookie to tell if we need to scale up or down. ) |
342 | Else atomic_add(scale, & Cookie to tell if we need to scale up or down. ) |
344 | Else |
352 | If diff < max_scale Then atomic_dec( & Cookie to tell if we need to scale up or down. ) |
354 | Else |
Name | Describe |
---|---|
iolatency_check_latencies | |
blkiolatency_timer_fn |
Source code conversion tool public plug-in interface | X |
---|---|
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion |