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- diff -Naru /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/fiops-iosched.c /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/fiops-iosched.c
- --- /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/fiops-iosched.c 1970-01-01 10:00:00.000000000 +1000
- +++ /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/fiops-iosched.c 2019-06-15 01:31:58.598659485 +1000
- @@ -0,0 +1,780 @@
- +/*
- + * IOPS based IO scheduler. Based on CFQ.
- + * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
- + * Shaohua Li <shli@kernel.org>
- + */
- +#include <linux/module.h>
- +#include <linux/slab.h>
- +#include <linux/blkdev.h>
- +#include <linux/elevator.h>
- +#include <linux/jiffies.h>
- +#include <linux/rbtree.h>
- +#include <linux/ioprio.h>
- +#include <linux/blktrace_api.h>
- +#include "blk.h"
- +
- +#define VIOS_SCALE_SHIFT 10
- +#define VIOS_SCALE (1 << VIOS_SCALE_SHIFT)
- +
- +#define VIOS_READ_SCALE (8)
- +#define VIOS_WRITE_SCALE (12)
- +#define VIOS_SYNC_SCALE (8)
- +#define VIOS_ASYNC_SCALE (10)
- +
- +#define VIOS_PRIO_SCALE (5)
- +
- +struct fiops_rb_root {
- + struct rb_root rb;
- + struct rb_node *left;
- + unsigned count;
- +
- + u64 min_vios;
- +};
- +#define FIOPS_RB_ROOT (struct fiops_rb_root) { .rb = RB_ROOT}
- +
- +enum wl_prio_t {
- + IDLE_WORKLOAD = 0,
- + BE_WORKLOAD = 1,
- + RT_WORKLOAD = 2,
- + FIOPS_PRIO_NR,
- +};
- +
- +struct fiops_data {
- + struct request_queue *queue;
- +
- + struct fiops_rb_root service_tree[FIOPS_PRIO_NR];
- +
- + unsigned int busy_queues;
- + unsigned int in_flight[2];
- +
- + struct work_struct unplug_work;
- +
- + unsigned int read_scale;
- + unsigned int write_scale;
- + unsigned int sync_scale;
- + unsigned int async_scale;
- +};
- +
- +struct fiops_ioc {
- + struct io_cq icq;
- +
- + unsigned int flags;
- + struct fiops_data *fiopsd;
- + struct rb_node rb_node;
- + u64 vios; /* key in service_tree */
- + struct fiops_rb_root *service_tree;
- +
- + unsigned int in_flight;
- +
- + struct rb_root sort_list;
- + struct list_head fifo;
- +
- + pid_t pid;
- + unsigned short ioprio;
- + enum wl_prio_t wl_type;
- +};
- +
- +#define ioc_service_tree(ioc) (&((ioc)->fiopsd->service_tree[(ioc)->wl_type]))
- +#define RQ_CIC(rq) icq_to_cic((rq)->elv.icq)
- +
- +enum ioc_state_flags {
- + FIOPS_IOC_FLAG_on_rr = 0, /* on round-robin busy list */
- + FIOPS_IOC_FLAG_prio_changed, /* task priority has changed */
- +};
- +
- +#define FIOPS_IOC_FNS(name) \
- +static inline void fiops_mark_ioc_##name(struct fiops_ioc *ioc) \
- +{ \
- + ioc->flags |= (1 << FIOPS_IOC_FLAG_##name); \
- +} \
- +static inline void fiops_clear_ioc_##name(struct fiops_ioc *ioc) \
- +{ \
- + ioc->flags &= ~(1 << FIOPS_IOC_FLAG_##name); \
- +} \
- +static inline int fiops_ioc_##name(const struct fiops_ioc *ioc) \
- +{ \
- + return ((ioc)->flags & (1 << FIOPS_IOC_FLAG_##name)) != 0; \
- +}
- +
- +FIOPS_IOC_FNS(on_rr);
- +FIOPS_IOC_FNS(prio_changed);
- +#undef FIOPS_IOC_FNS
- +/*
- +#define fiops_log_ioc(fiopsd, ioc, fmt, args...) \
- + blk_add_trace_msg((fiopsd)->queue, "ioc%d " fmt, (ioc)->pid, ##args)
- +#define fiops_log(fiopsd, fmt, args...) \
- + blk_add_trace_msg((fiopsd)->queue, "fiops " fmt, ##args)
- +*/
- +enum wl_prio_t fiops_wl_type(short prio_class)
- +{
- + if (prio_class == IOPRIO_CLASS_RT)
- + return RT_WORKLOAD;
- + if (prio_class == IOPRIO_CLASS_BE)
- + return BE_WORKLOAD;
- + return IDLE_WORKLOAD;
- +}
- +
- +static inline struct fiops_ioc *icq_to_cic(struct io_cq *icq)
- +{
- + /* cic->icq is the first member, %NULL will convert to %NULL */
- + return container_of(icq, struct fiops_ioc, icq);
- +}
- +
- +static inline struct fiops_ioc *fiops_cic_lookup(struct fiops_data *fiopsd,
- + struct io_context *ioc)
- +{
- + if (ioc)
- + return icq_to_cic(ioc_lookup_icq(ioc, fiopsd->queue));
- + return NULL;
- +}
- +
- +/*
- + * The below is leftmost cache rbtree addon
- + */
- +static struct fiops_ioc *fiops_rb_first(struct fiops_rb_root *root)
- +{
- + /* Service tree is empty */
- + if (!root->count)
- + return NULL;
- +
- + if (!root->left)
- + root->left = rb_first(&root->rb);
- +
- + if (root->left)
- + return rb_entry(root->left, struct fiops_ioc, rb_node);
- +
- + return NULL;
- +}
- +
- +static void rb_erase_init(struct rb_node *n, struct rb_root *root)
- +{
- + rb_erase(n, root);
- + RB_CLEAR_NODE(n);
- +}
- +
- +static void fiops_rb_erase(struct rb_node *n, struct fiops_rb_root *root)
- +{
- + if (root->left == n)
- + root->left = NULL;
- + rb_erase_init(n, &root->rb);
- + --root->count;
- +}
- +
- +static inline u64 max_vios(u64 min_vios, u64 vios)
- +{
- + s64 delta = (s64)(vios - min_vios);
- + if (delta > 0)
- + min_vios = vios;
- +
- + return min_vios;
- +}
- +
- +static void fiops_update_min_vios(struct fiops_rb_root *service_tree)
- +{
- + struct fiops_ioc *ioc;
- +
- + ioc = fiops_rb_first(service_tree);
- + if (!ioc)
- + return;
- + service_tree->min_vios = max_vios(service_tree->min_vios, ioc->vios);
- +}
- +
- +/*
- + * The fiopsd->service_trees holds all pending fiops_ioc's that have
- + * requests waiting to be processed. It is sorted in the order that
- + * we will service the queues.
- + */
- +static void fiops_service_tree_add(struct fiops_data *fiopsd,
- + struct fiops_ioc *ioc)
- +{
- + struct rb_node **p, *parent;
- + struct fiops_ioc *__ioc;
- + struct fiops_rb_root *service_tree = ioc_service_tree(ioc);
- + u64 vios;
- + int left;
- +
- + /* New added IOC */
- + if (RB_EMPTY_NODE(&ioc->rb_node)) {
- + if (ioc->in_flight > 0)
- + vios = ioc->vios;
- + else
- + vios = max_vios(service_tree->min_vios, ioc->vios);
- + } else {
- + vios = ioc->vios;
- + /* ioc->service_tree might not equal to service_tree */
- + fiops_rb_erase(&ioc->rb_node, ioc->service_tree);
- + ioc->service_tree = NULL;
- + }
- +
- + //fiops_log_ioc(fiopsd, ioc, "service tree add, vios %lld", vios);
- +
- + left = 1;
- + parent = NULL;
- + ioc->service_tree = service_tree;
- + p = &service_tree->rb.rb_node;
- + while (*p) {
- + struct rb_node **n;
- +
- + parent = *p;
- + __ioc = rb_entry(parent, struct fiops_ioc, rb_node);
- +
- + /*
- + * sort by key, that represents service time.
- + */
- + if (vios < __ioc->vios)
- + n = &(*p)->rb_left;
- + else {
- + n = &(*p)->rb_right;
- + left = 0;
- + }
- +
- + p = n;
- + }
- +
- + if (left)
- + service_tree->left = &ioc->rb_node;
- +
- + ioc->vios = vios;
- + rb_link_node(&ioc->rb_node, parent, p);
- + rb_insert_color(&ioc->rb_node, &service_tree->rb);
- + service_tree->count++;
- +
- + fiops_update_min_vios(service_tree);
- +}
- +
- +/*
- + * Update ioc's position in the service tree.
- + */
- +static void fiops_resort_rr_list(struct fiops_data *fiopsd,
- + struct fiops_ioc *ioc)
- +{
- + /*
- + * Resorting requires the ioc to be on the RR list already.
- + */
- + if (fiops_ioc_on_rr(ioc))
- + fiops_service_tree_add(fiopsd, ioc);
- +}
- +
- +/*
- + * add to busy list of queues for service, trying to be fair in ordering
- + * the pending list according to last request service
- + */
- +static void fiops_add_ioc_rr(struct fiops_data *fiopsd, struct fiops_ioc *ioc)
- +{
- + BUG_ON(fiops_ioc_on_rr(ioc));
- + fiops_mark_ioc_on_rr(ioc);
- +
- + fiopsd->busy_queues++;
- +
- + fiops_resort_rr_list(fiopsd, ioc);
- +}
- +
- +/*
- + * Called when the ioc no longer has requests pending, remove it from
- + * the service tree.
- + */
- +static void fiops_del_ioc_rr(struct fiops_data *fiopsd, struct fiops_ioc *ioc)
- +{
- + BUG_ON(!fiops_ioc_on_rr(ioc));
- + fiops_clear_ioc_on_rr(ioc);
- +
- + if (!RB_EMPTY_NODE(&ioc->rb_node)) {
- + fiops_rb_erase(&ioc->rb_node, ioc->service_tree);
- + ioc->service_tree = NULL;
- + }
- +
- + BUG_ON(!fiopsd->busy_queues);
- + fiopsd->busy_queues--;
- +}
- +
- +/*
- + * rb tree support functions
- + */
- +static void fiops_del_rq_rb(struct request *rq)
- +{
- + struct fiops_ioc *ioc = RQ_CIC(rq);
- +
- + elv_rb_del(&ioc->sort_list, rq);
- +}
- +
- +static void fiops_add_rq_rb(struct request *rq)
- +{
- + struct fiops_ioc *ioc = RQ_CIC(rq);
- + struct fiops_data *fiopsd = ioc->fiopsd;
- +
- + elv_rb_add(&ioc->sort_list, rq);
- +
- + if (!fiops_ioc_on_rr(ioc))
- + fiops_add_ioc_rr(fiopsd, ioc);
- +}
- +
- +static void fiops_reposition_rq_rb(struct fiops_ioc *ioc, struct request *rq)
- +{
- + elv_rb_del(&ioc->sort_list, rq);
- + fiops_add_rq_rb(rq);
- +}
- +
- +static void fiops_remove_request(struct request *rq)
- +{
- + list_del_init(&rq->queuelist);
- + fiops_del_rq_rb(rq);
- +}
- +
- +static u64 fiops_scaled_vios(struct fiops_data *fiopsd,
- + struct fiops_ioc *ioc, struct request *rq)
- +{
- + int vios = VIOS_SCALE;
- +
- + if (rq_data_dir(rq) == WRITE)
- + vios = vios * fiopsd->write_scale / fiopsd->read_scale;
- +
- + if (!rq_is_sync(rq))
- + vios = vios * fiopsd->async_scale / fiopsd->sync_scale;
- +
- + vios += vios * (ioc->ioprio - IOPRIO_NORM) / VIOS_PRIO_SCALE;
- +
- + return vios;
- +}
- +
- +/* return vios dispatched */
- +static u64 fiops_dispatch_request(struct fiops_data *fiopsd,
- + struct fiops_ioc *ioc)
- +{
- + struct request *rq;
- + struct request_queue *q = fiopsd->queue;
- +
- + rq = rq_entry_fifo(ioc->fifo.next);
- +
- + fiops_remove_request(rq);
- + elv_dispatch_add_tail(q, rq);
- +
- + fiopsd->in_flight[rq_is_sync(rq)]++;
- + ioc->in_flight++;
- +
- + return fiops_scaled_vios(fiopsd, ioc, rq);
- +}
- +
- +static int fiops_forced_dispatch(struct fiops_data *fiopsd)
- +{
- + struct fiops_ioc *ioc;
- + int dispatched = 0;
- + int i;
- +
- + for (i = RT_WORKLOAD; i >= IDLE_WORKLOAD; i--) {
- + while (!RB_EMPTY_ROOT(&fiopsd->service_tree[i].rb)) {
- + ioc = fiops_rb_first(&fiopsd->service_tree[i]);
- +
- + while (!list_empty(&ioc->fifo)) {
- + fiops_dispatch_request(fiopsd, ioc);
- + dispatched++;
- + }
- + if (fiops_ioc_on_rr(ioc))
- + fiops_del_ioc_rr(fiopsd, ioc);
- + }
- + }
- + return dispatched;
- +}
- +
- +static struct fiops_ioc *fiops_select_ioc(struct fiops_data *fiopsd)
- +{
- + struct fiops_ioc *ioc;
- + struct fiops_rb_root *service_tree = NULL;
- + int i;
- + struct request *rq;
- +
- + for (i = RT_WORKLOAD; i >= IDLE_WORKLOAD; i--) {
- + if (!RB_EMPTY_ROOT(&fiopsd->service_tree[i].rb)) {
- + service_tree = &fiopsd->service_tree[i];
- + break;
- + }
- + }
- +
- + if (!service_tree)
- + return NULL;
- +
- + ioc = fiops_rb_first(service_tree);
- +
- + rq = rq_entry_fifo(ioc->fifo.next);
- + /*
- + * we are the only async task and sync requests are in flight, delay a
- + * moment. If there are other tasks coming, sync tasks have no chance
- + * to be starved, don't delay
- + */
- + if (!rq_is_sync(rq) && fiopsd->in_flight[1] != 0 &&
- + service_tree->count == 1) {
- + //fiops_log_ioc(fiopsd, ioc,
- + // "postpone async, in_flight async %d sync %d",
- + // fiopsd->in_flight[0], fiopsd->in_flight[1]);
- + return NULL;
- + }
- +
- +
- + /* Let sync request preempt async queue */
- + if (!rq_is_sync(rq) && service_tree->count > 1) {
- + struct rb_node *tmp = rb_next(&ioc->rb_node);
- + struct fiops_ioc *sync_ioc = NULL;
- + while (tmp) {
- + sync_ioc = rb_entry(tmp, struct fiops_ioc, rb_node);
- + rq = rq_entry_fifo(sync_ioc->fifo.next);
- + if (rq_is_sync(rq))
- + break;
- + tmp = rb_next(&sync_ioc->rb_node);
- + }
- + if (sync_ioc)
- + ioc = sync_ioc;
- + }
- +
- +
- + return ioc;
- +}
- +
- +static void fiops_charge_vios(struct fiops_data *fiopsd,
- + struct fiops_ioc *ioc, u64 vios)
- +{
- + struct fiops_rb_root *service_tree = ioc->service_tree;
- + ioc->vios += vios;
- +
- + //fiops_log_ioc(fiopsd, ioc, "charge vios %lld, new vios %lld", vios, ioc->vios);
- +
- + if (RB_EMPTY_ROOT(&ioc->sort_list))
- + fiops_del_ioc_rr(fiopsd, ioc);
- + else
- + fiops_resort_rr_list(fiopsd, ioc);
- +
- + fiops_update_min_vios(service_tree);
- +}
- +
- +static int fiops_dispatch_requests(struct request_queue *q, int force)
- +{
- + struct fiops_data *fiopsd = q->elevator->elevator_data;
- + struct fiops_ioc *ioc;
- + u64 vios;
- +
- + if (unlikely(force))
- + return fiops_forced_dispatch(fiopsd);
- +
- + ioc = fiops_select_ioc(fiopsd);
- + if (!ioc)
- + return 0;
- +
- + vios = fiops_dispatch_request(fiopsd, ioc);
- +
- + fiops_charge_vios(fiopsd, ioc, vios);
- + return 1;
- +}
- +
- +static void fiops_init_prio_data(struct fiops_ioc *cic)
- +{
- + struct task_struct *tsk = current;
- + struct io_context *ioc = cic->icq.ioc;
- + int ioprio_class;
- +
- + if (!fiops_ioc_prio_changed(cic))
- + return;
- +
- + ioprio_class = IOPRIO_PRIO_CLASS(ioc->ioprio);
- + switch (ioprio_class) {
- + default:
- + printk(KERN_ERR "fiops: bad prio %x\n", ioprio_class);
- + case IOPRIO_CLASS_NONE:
- + /*
- + * no prio set, inherit CPU scheduling settings
- + */
- + cic->ioprio = task_nice_ioprio(tsk);
- + cic->wl_type = fiops_wl_type(task_nice_ioclass(tsk));
- + break;
- + case IOPRIO_CLASS_RT:
- + cic->ioprio = IOPRIO_PRIO_DATA(ioc->ioprio);
- + cic->wl_type = fiops_wl_type(IOPRIO_CLASS_RT);
- + break;
- + case IOPRIO_CLASS_BE:
- + cic->ioprio = IOPRIO_PRIO_DATA(ioc->ioprio);
- + cic->wl_type = fiops_wl_type(IOPRIO_CLASS_BE);
- + break;
- + case IOPRIO_CLASS_IDLE:
- + cic->wl_type = fiops_wl_type(IOPRIO_CLASS_IDLE);
- + cic->ioprio = 7;
- + break;
- + }
- +
- + fiops_clear_ioc_prio_changed(cic);
- +}
- +
- +static void fiops_insert_request(struct request_queue *q, struct request *rq)
- +{
- + struct fiops_ioc *ioc = RQ_CIC(rq);
- +
- + fiops_init_prio_data(ioc);
- +
- + list_add_tail(&rq->queuelist, &ioc->fifo);
- +
- + fiops_add_rq_rb(rq);
- +}
- +
- +/*
- + * scheduler run of queue, if there are requests pending and no one in the
- + * driver that will restart queueing
- + */
- +static inline void fiops_schedule_dispatch(struct fiops_data *fiopsd)
- +{
- + if (fiopsd->busy_queues)
- + kblockd_schedule_work(&fiopsd->unplug_work);
- +}
- +
- +static void fiops_completed_request(struct request_queue *q, struct request *rq)
- +{
- + struct fiops_data *fiopsd = q->elevator->elevator_data;
- + struct fiops_ioc *ioc = RQ_CIC(rq);
- +
- + fiopsd->in_flight[rq_is_sync(rq)]--;
- + ioc->in_flight--;
- +
- + //fiops_log_ioc(fiopsd, ioc, "in_flight %d, busy queues %d",
- + // ioc->in_flight, fiopsd->busy_queues);
- +
- + if (fiopsd->in_flight[0] + fiopsd->in_flight[1] == 0)
- + fiops_schedule_dispatch(fiopsd);
- +}
- +
- +static struct request *
- +fiops_find_rq_fmerge(struct fiops_data *fiopsd, struct bio *bio)
- +{
- + struct task_struct *tsk = current;
- + struct fiops_ioc *cic;
- +
- + cic = fiops_cic_lookup(fiopsd, tsk->io_context);
- +
- + if (cic) {
- + return elv_rb_find(&cic->sort_list, bio_end_sector(bio));
- + }
- +
- + return NULL;
- +}
- +
- +static int fiops_merge(struct request_queue *q, struct request **req,
- + struct bio *bio)
- +{
- + struct fiops_data *fiopsd = q->elevator->elevator_data;
- + struct request *__rq;
- +
- + __rq = fiops_find_rq_fmerge(fiopsd, bio);
- + if (__rq && elv_rq_merge_ok(__rq, bio)) {
- + *req = __rq;
- + return ELEVATOR_FRONT_MERGE;
- + }
- +
- + return ELEVATOR_NO_MERGE;
- +}
- +
- +static void fiops_merged_request(struct request_queue *q, struct request *req,
- + int type)
- +{
- + if (type == ELEVATOR_FRONT_MERGE) {
- + struct fiops_ioc *ioc = RQ_CIC(req);
- +
- + fiops_reposition_rq_rb(ioc, req);
- + }
- +}
- +
- +static void
- +fiops_merged_requests(struct request_queue *q, struct request *rq,
- + struct request *next)
- +{
- + struct fiops_ioc *ioc = RQ_CIC(rq);
- + struct fiops_data *fiopsd = q->elevator->elevator_data;
- +
- + fiops_remove_request(next);
- +
- + ioc = RQ_CIC(next);
- + /*
- + * all requests of this task are merged to other tasks, delete it
- + * from the service tree.
- + */
- + if (fiops_ioc_on_rr(ioc) && RB_EMPTY_ROOT(&ioc->sort_list))
- + fiops_del_ioc_rr(fiopsd, ioc);
- +}
- +
- +static int fiops_allow_merge(struct request_queue *q, struct request *rq,
- + struct bio *bio)
- +{
- + struct fiops_data *fiopsd = q->elevator->elevator_data;
- + struct fiops_ioc *cic;
- +
- + /*
- + * Lookup the ioc that this bio will be queued with. Allow
- + * merge only if rq is queued there.
- + */
- + cic = fiops_cic_lookup(fiopsd, current->io_context);
- +
- + return cic == RQ_CIC(rq);
- +}
- +
- +static void fiops_exit_queue(struct elevator_queue *e)
- +{
- + struct fiops_data *fiopsd = e->elevator_data;
- +
- + cancel_work_sync(&fiopsd->unplug_work);
- +
- + kfree(fiopsd);
- +}
- +
- +static void fiops_kick_queue(struct work_struct *work)
- +{
- + struct fiops_data *fiopsd =
- + container_of(work, struct fiops_data, unplug_work);
- + struct request_queue *q = fiopsd->queue;
- +
- + spin_lock_irq(q->queue_lock);
- + __blk_run_queue(q);
- + spin_unlock_irq(q->queue_lock);
- +}
- +
- +static int fiops_init_queue(struct request_queue *q, struct elevator_type *e)
- +{
- + struct fiops_data *fiopsd;
- + int i;
- + struct elevator_queue *eq;
- +
- + eq = elevator_alloc(q, e);
- + if (!eq)
- + return -ENOMEM;
- +
- + fiopsd = kzalloc_node(sizeof(*fiopsd), GFP_KERNEL, q->node);
- + if (!fiopsd) {
- + kobject_put(&eq->kobj);
- + return -ENOMEM;
- + }
- + eq->elevator_data = fiopsd;
- +
- + fiopsd->queue = q;
- + spin_lock_irq(q->queue_lock);
- + q->elevator = eq;
- + spin_unlock_irq(q->queue_lock);
- +
- + for (i = IDLE_WORKLOAD; i <= RT_WORKLOAD; i++)
- + fiopsd->service_tree[i] = FIOPS_RB_ROOT;
- +
- + INIT_WORK(&fiopsd->unplug_work, fiops_kick_queue);
- +
- + fiopsd->read_scale = VIOS_READ_SCALE;
- + fiopsd->write_scale = VIOS_WRITE_SCALE;
- + fiopsd->sync_scale = VIOS_SYNC_SCALE;
- + fiopsd->async_scale = VIOS_ASYNC_SCALE;
- +
- + return 0;
- +}
- +
- +static void fiops_init_icq(struct io_cq *icq)
- +{
- + struct fiops_data *fiopsd = icq->q->elevator->elevator_data;
- + struct fiops_ioc *ioc = icq_to_cic(icq);
- +
- + RB_CLEAR_NODE(&ioc->rb_node);
- + INIT_LIST_HEAD(&ioc->fifo);
- + ioc->sort_list = RB_ROOT;
- +
- + ioc->fiopsd = fiopsd;
- +
- + ioc->pid = current->pid;
- + fiops_mark_ioc_prio_changed(ioc);
- +}
- +
- +/*
- + * sysfs parts below -->
- + */
- +static ssize_t
- +fiops_var_show(unsigned int var, char *page)
- +{
- + return sprintf(page, "%d\n", var);
- +}
- +
- +static ssize_t
- +fiops_var_store(unsigned int *var, const char *page, size_t count)
- +{
- + char *p = (char *) page;
- +
- + *var = simple_strtoul(p, &p, 10);
- + return count;
- +}
- +
- +#define SHOW_FUNCTION(__FUNC, __VAR) \
- +static ssize_t __FUNC(struct elevator_queue *e, char *page) \
- +{ \
- + struct fiops_data *fiopsd = e->elevator_data; \
- + return fiops_var_show(__VAR, (page)); \
- +}
- +SHOW_FUNCTION(fiops_read_scale_show, fiopsd->read_scale);
- +SHOW_FUNCTION(fiops_write_scale_show, fiopsd->write_scale);
- +SHOW_FUNCTION(fiops_sync_scale_show, fiopsd->sync_scale);
- +SHOW_FUNCTION(fiops_async_scale_show, fiopsd->async_scale);
- +#undef SHOW_FUNCTION
- +
- +#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \
- +static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \
- +{ \
- + struct fiops_data *fiopsd = e->elevator_data; \
- + unsigned int __data; \
- + int ret = fiops_var_store(&__data, (page), count); \
- + if (__data < (MIN)) \
- + __data = (MIN); \
- + else if (__data > (MAX)) \
- + __data = (MAX); \
- + *(__PTR) = __data; \
- + return ret; \
- +}
- +STORE_FUNCTION(fiops_read_scale_store, &fiopsd->read_scale, 1, 100);
- +STORE_FUNCTION(fiops_write_scale_store, &fiopsd->write_scale, 1, 100);
- +STORE_FUNCTION(fiops_sync_scale_store, &fiopsd->sync_scale, 1, 100);
- +STORE_FUNCTION(fiops_async_scale_store, &fiopsd->async_scale, 1, 100);
- +#undef STORE_FUNCTION
- +
- +#define FIOPS_ATTR(name) \
- + __ATTR(name, S_IRUGO|S_IWUSR, fiops_##name##_show, fiops_##name##_store)
- +
- +static struct elv_fs_entry fiops_attrs[] = {
- + FIOPS_ATTR(read_scale),
- + FIOPS_ATTR(write_scale),
- + FIOPS_ATTR(sync_scale),
- + FIOPS_ATTR(async_scale),
- + __ATTR_NULL
- +};
- +
- +static struct elevator_type iosched_fiops = {
- + .ops = {
- + .elevator_merge_fn = fiops_merge,
- + .elevator_merged_fn = fiops_merged_request,
- + .elevator_merge_req_fn = fiops_merged_requests,
- + .elevator_allow_merge_fn = fiops_allow_merge,
- + .elevator_dispatch_fn = fiops_dispatch_requests,
- + .elevator_add_req_fn = fiops_insert_request,
- + .elevator_completed_req_fn = fiops_completed_request,
- + .elevator_former_req_fn = elv_rb_former_request,
- + .elevator_latter_req_fn = elv_rb_latter_request,
- + .elevator_init_icq_fn = fiops_init_icq,
- + .elevator_init_fn = fiops_init_queue,
- + .elevator_exit_fn = fiops_exit_queue,
- + },
- + .icq_size = sizeof(struct fiops_ioc),
- + .icq_align = __alignof__(struct fiops_ioc),
- + .elevator_attrs = fiops_attrs,
- + .elevator_name = "fiops",
- + .elevator_owner = THIS_MODULE,
- +};
- +
- +static int __init fiops_init(void)
- +{
- + return elv_register(&iosched_fiops);
- +}
- +
- +static void __exit fiops_exit(void)
- +{
- + elv_unregister(&iosched_fiops);
- +}
- +
- +module_init(fiops_init);
- +module_exit(fiops_exit);
- +
- +MODULE_AUTHOR("Jens Axboe, Shaohua Li <shli@kernel.org>");
- +MODULE_LICENSE("GPL");
- +MODULE_DESCRIPTION("IOPS based IO scheduler");
- +
- diff -Naru /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/Kconfig.iosched /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/Kconfig.iosched
- --- /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/Kconfig.iosched 2019-06-14 22:16:51.041450494 +1000
- +++ /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/Kconfig.iosched 2019-06-15 08:41:47.613812478 +1000
- @@ -43,6 +43,24 @@
- This is the default I/O scheduler.
- +config IOSCHED_FIOPS
- + tristate "IOPS based I/O scheduler"
- + default y
- + ---help---
- + This is an IOPS based I/O scheduler. It will try to distribute
- + IOPS equally among all processes in the system. It's mainly for
- + Flash based storage.
- +
- +config IOSCHED_SIO
- + tristate "Simple I/O scheduler"
- + default y
- + ---help---
- + The Simple I/O scheduler is an extremely simple scheduler,
- + based on noop and deadline, that relies on deadlines to
- + ensure fairness. The algorithm does not do any sorting but
- + basic merging, trying to keep a minimum overhead. It is aimed
- + mainly for aleatory access devices (eg: flash devices).
- +
- config CFQ_GROUP_IOSCHED
- bool "CFQ Group Scheduling support"
- depends on IOSCHED_CFQ && BLK_CGROUP
- @@ -95,6 +113,12 @@
- config DEFAULT_NOOP
- bool "No-op"
- + config DEFAULT_SIO
- + bool "SIO" if IOSCHED_SIO=y
- +
- + config DEFAULT_FIOPS
- + bool "FIOPS" if IOSCHED_FIOPS=y
- +
- endchoice
- config DEFAULT_IOSCHED
- @@ -103,6 +127,8 @@
- default "cfq" if DEFAULT_CFQ
- default "bfq" if DEFAULT_BFQ
- default "noop" if DEFAULT_NOOP
- + default "fiops" if DEFAULT_FIOPS
- + default "sio" if DEFAULT_SIO
- endmenu
- diff -Naru /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/Makefile /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/Makefile
- --- /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/Makefile 2019-06-14 22:16:51.041450494 +1000
- +++ /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/Makefile 2019-06-15 08:44:21.754339930 +1000
- @@ -20,6 +20,8 @@
- obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
- obj-$(CONFIG_IOSCHED_BFQ) += bfq-iosched.o
- obj-$(CONFIG_IOSCHED_TEST) += test-iosched.o
- +obj-$(CONFIG_IOSCHED_FIOPS) += fiops-iosched.o
- +obj-$(CONFIG_IOSCHED_SIO) += sio-iosched.o
- obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
- obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o
- diff -Naru /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/sio-iosched.c /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/sio-iosched.c
- --- /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/whyred/block/sio-iosched.c 1970-01-01 10:00:00.000000000 +1000
- +++ /media/lubuntu/89fd54bd-f15b-4853-ab4e-83e86839bc35/lin-16.0/kernel/xiaomi/why/block/sio-iosched.c 2019-06-15 08:38:53.597814071 +1000
- @@ -0,0 +1,412 @@
- +/*
- + * Simple IO scheduler
- + * Based on Noop, Deadline and V(R) IO schedulers.
- + *
- + * Copyright (C) 2012 Miguel Boton <mboton@gmail.com>
- + *
- + *
- + * This algorithm does not do any kind of sorting, as it is aimed for
- + * aleatory access devices, but it does some basic merging. We try to
- + * keep minimum overhead to achieve low latency.
- + *
- + * Asynchronous and synchronous requests are not treated separately, but
- + * we relay on deadlines to ensure fairness.
- + *
- + */
- +#include <linux/blkdev.h>
- +#include <linux/elevator.h>
- +#include <linux/bio.h>
- +#include <linux/module.h>
- +#include <linux/init.h>
- +#include <linux/version.h>
- +#include <linux/slab.h>
- +
- +enum { ASYNC, SYNC };
- +
- +/* Tunables */
- +static const int sync_read_expire = HZ / 2; /* max time before a sync read is submitted. */
- +static const int sync_write_expire = 2 * HZ; /* max time before a sync write is submitted. */
- +
- +static const int async_read_expire = 4 * HZ; /* ditto for async, these limits are SOFT! */
- +static const int async_write_expire = 16 * HZ; /* ditto for async, these limits are SOFT! */
- +
- +static const int writes_starved = 2; /* max times reads can starve a write */
- +static const int fifo_batch = 8; /* # of sequential requests treated as one
- + by the above parameters. For throughput. */
- +
- +/* Elevator data */
- +struct sio_data {
- + /* Request queues */
- + struct list_head fifo_list[2][2];
- +
- + /* Attributes */
- + unsigned int batched;
- + unsigned int starved;
- +
- + /* Settings */
- + int fifo_expire[2][2];
- + int fifo_batch;
- + int writes_starved;
- +};
- +
- +static void
- +sio_merged_requests(struct request_queue *q, struct request *rq,
- + struct request *next)
- +{
- + /*
- + * If next expires before rq, assign its expire time to rq
- + * and move into next position (next will be deleted) in fifo.
- + */
- + if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist)) {
- + if (time_before(next->fifo_time, rq->fifo_time)) {
- + list_move(&rq->queuelist, &next->queuelist);
- + rq->fifo_time = next->fifo_time;
- + }
- + }
- +
- + /* Delete next request */
- + rq_fifo_clear(next);
- +}
- +
- +static void
- +sio_add_request(struct request_queue *q, struct request *rq)
- +{
- + struct sio_data *sd = q->elevator->elevator_data;
- + const int sync = rq_is_sync(rq);
- + const int data_dir = rq_data_dir(rq);
- +
- + /*
- + * Add request to the proper fifo list and set its
- + * expire time.
- + */
- + rq->fifo_time = jiffies + sd->fifo_expire[sync][data_dir];
- + list_add_tail(&rq->queuelist, &sd->fifo_list[sync][data_dir]);
- +}
- +
- +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,38)
- +static int
- +sio_queue_empty(struct request_queue *q)
- +{
- + struct sio_data *sd = q->elevator->elevator_data;
- +
- + /* Check if fifo lists are empty */
- + return list_empty(&sd->fifo_list[SYNC][READ]) && list_empty(&sd->fifo_list[SYNC][WRITE]) &&
- + list_empty(&sd->fifo_list[ASYNC][READ]) && list_empty(&sd->fifo_list[ASYNC][WRITE]);
- +}
- +#endif
- +
- +static struct request *
- +sio_expired_request(struct sio_data *sd, int sync, int data_dir)
- +{
- + struct list_head *list = &sd->fifo_list[sync][data_dir];
- + struct request *rq;
- +
- + if (list_empty(list))
- + return NULL;
- +
- + /* Retrieve request */
- + rq = rq_entry_fifo(list->next);
- +
- + /* Request has expired */
- + if (time_after(jiffies, rq->fifo_time))
- + return rq;
- +
- + return NULL;
- +}
- +
- +static struct request *
- +sio_choose_expired_request(struct sio_data *sd)
- +{
- + struct request *rq;
- +
- + /*
- + * Check expired requests.
- + * Asynchronous requests have priority over synchronous.
- + * Write requests have priority over read.
- + */
- + rq = sio_expired_request(sd, ASYNC, WRITE);
- + if (rq)
- + return rq;
- + rq = sio_expired_request(sd, ASYNC, READ);
- + if (rq)
- + return rq;
- +
- + rq = sio_expired_request(sd, SYNC, WRITE);
- + if (rq)
- + return rq;
- + rq = sio_expired_request(sd, SYNC, READ);
- + if (rq)
- + return rq;
- +
- + return NULL;
- +}
- +
- +static struct request *
- +sio_choose_request(struct sio_data *sd, int data_dir)
- +{
- + struct list_head *sync = sd->fifo_list[SYNC];
- + struct list_head *async = sd->fifo_list[ASYNC];
- +
- + /*
- + * Retrieve request from available fifo list.
- + * Synchronous requests have priority over asynchronous.
- + * Read requests have priority over write.
- + */
- + if (!list_empty(&sync[data_dir]))
- + return rq_entry_fifo(sync[data_dir].next);
- + if (!list_empty(&async[data_dir]))
- + return rq_entry_fifo(async[data_dir].next);
- +
- + if (!list_empty(&sync[!data_dir]))
- + return rq_entry_fifo(sync[!data_dir].next);
- + if (!list_empty(&async[!data_dir]))
- + return rq_entry_fifo(async[!data_dir].next);
- +
- + return NULL;
- +}
- +
- +static inline void
- +sio_dispatch_request(struct sio_data *sd, struct request *rq)
- +{
- + /*
- + * Remove the request from the fifo list
- + * and dispatch it.
- + */
- + rq_fifo_clear(rq);
- + elv_dispatch_add_tail(rq->q, rq);
- +
- + sd->batched++;
- +
- + if (rq_data_dir(rq))
- + sd->starved = 0;
- + else
- + sd->starved++;
- +}
- +
- +static int
- +sio_dispatch_requests(struct request_queue *q, int force)
- +{
- + struct sio_data *sd = q->elevator->elevator_data;
- + struct request *rq = NULL;
- + int data_dir = READ;
- +
- + /*
- + * Retrieve any expired request after a batch of
- + * sequential requests.
- + */
- + if (sd->batched > sd->fifo_batch) {
- + sd->batched = 0;
- + rq = sio_choose_expired_request(sd);
- + }
- +
- + /* Retrieve request */
- + if (!rq) {
- + if (sd->starved > sd->writes_starved)
- + data_dir = WRITE;
- +
- + rq = sio_choose_request(sd, data_dir);
- + if (!rq)
- + return 0;
- + }
- +
- + /* Dispatch request */
- + sio_dispatch_request(sd, rq);
- +
- + return 1;
- +}
- +
- +static struct request *
- +sio_former_request(struct request_queue *q, struct request *rq)
- +{
- + struct sio_data *sd = q->elevator->elevator_data;
- + const int sync = rq_is_sync(rq);
- + const int data_dir = rq_data_dir(rq);
- +
- + if (rq->queuelist.prev == &sd->fifo_list[sync][data_dir])
- + return NULL;
- +
- + /* Return former request */
- + return list_entry(rq->queuelist.prev, struct request, queuelist);
- +}
- +
- +static struct request *
- +sio_latter_request(struct request_queue *q, struct request *rq)
- +{
- + struct sio_data *sd = q->elevator->elevator_data;
- + const int sync = rq_is_sync(rq);
- + const int data_dir = rq_data_dir(rq);
- +
- + if (rq->queuelist.next == &sd->fifo_list[sync][data_dir])
- + return NULL;
- +
- + /* Return latter request */
- + return list_entry(rq->queuelist.next, struct request, queuelist);
- +}
- +
- +static int sio_init_queue(struct request_queue *q, struct elevator_type *e)
- +{
- + struct sio_data *sd;
- + struct elevator_queue *eq;
- +
- + eq = elevator_alloc(q, e);
- + if (!eq)
- + return -ENOMEM;
- +
- + /* Allocate structure */
- + sd = kmalloc_node(sizeof(*sd), GFP_KERNEL, q->node);
- + if (!sd) {
- + kobject_put(&eq->kobj);
- + return -ENOMEM;
- + }
- + eq->elevator_data = sd;
- +
- + spin_lock_irq(q->queue_lock);
- + q->elevator = eq;
- + spin_unlock_irq(q->queue_lock);
- +
- + /* Initialize fifo lists */
- + INIT_LIST_HEAD(&sd->fifo_list[SYNC][READ]);
- + INIT_LIST_HEAD(&sd->fifo_list[SYNC][WRITE]);
- + INIT_LIST_HEAD(&sd->fifo_list[ASYNC][READ]);
- + INIT_LIST_HEAD(&sd->fifo_list[ASYNC][WRITE]);
- +
- + /* Initialize data */
- + sd->batched = 0;
- + sd->fifo_expire[SYNC][READ] = sync_read_expire;
- + sd->fifo_expire[SYNC][WRITE] = sync_write_expire;
- + sd->fifo_expire[ASYNC][READ] = async_read_expire;
- + sd->fifo_expire[ASYNC][WRITE] = async_write_expire;
- + sd->fifo_batch = fifo_batch;
- +
- + return 0;
- +}
- +
- +static void
- +sio_exit_queue(struct elevator_queue *e)
- +{
- + struct sio_data *sd = e->elevator_data;
- +
- + BUG_ON(!list_empty(&sd->fifo_list[SYNC][READ]));
- + BUG_ON(!list_empty(&sd->fifo_list[SYNC][WRITE]));
- + BUG_ON(!list_empty(&sd->fifo_list[ASYNC][READ]));
- + BUG_ON(!list_empty(&sd->fifo_list[ASYNC][WRITE]));
- +
- + /* Free structure */
- + kfree(sd);
- +}
- +
- +/*
- + * sysfs code
- + */
- +
- +static ssize_t
- +sio_var_show(int var, char *page)
- +{
- + return sprintf(page, "%d\n", var);
- +}
- +
- +static ssize_t
- +sio_var_store(int *var, const char *page, size_t count)
- +{
- + char *p = (char *) page;
- +
- + *var = simple_strtol(p, &p, 10);
- + return count;
- +}
- +
- +#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \
- +static ssize_t __FUNC(struct elevator_queue *e, char *page) \
- +{ \
- + struct sio_data *sd = e->elevator_data; \
- + int __data = __VAR; \
- + if (__CONV) \
- + __data = jiffies_to_msecs(__data); \
- + return sio_var_show(__data, (page)); \
- +}
- +SHOW_FUNCTION(sio_sync_read_expire_show, sd->fifo_expire[SYNC][READ], 1);
- +SHOW_FUNCTION(sio_sync_write_expire_show, sd->fifo_expire[SYNC][WRITE], 1);
- +SHOW_FUNCTION(sio_async_read_expire_show, sd->fifo_expire[ASYNC][READ], 1);
- +SHOW_FUNCTION(sio_async_write_expire_show, sd->fifo_expire[ASYNC][WRITE], 1);
- +SHOW_FUNCTION(sio_fifo_batch_show, sd->fifo_batch, 0);
- +SHOW_FUNCTION(sio_writes_starved_show, sd->writes_starved, 0);
- +#undef SHOW_FUNCTION
- +
- +#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \
- +static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \
- +{ \
- + struct sio_data *sd = e->elevator_data; \
- + int __data; \
- + int ret = sio_var_store(&__data, (page), count); \
- + if (__data < (MIN)) \
- + __data = (MIN); \
- + else if (__data > (MAX)) \
- + __data = (MAX); \
- + if (__CONV) \
- + *(__PTR) = msecs_to_jiffies(__data); \
- + else \
- + *(__PTR) = __data; \
- + return ret; \
- +}
- +STORE_FUNCTION(sio_sync_read_expire_store, &sd->fifo_expire[SYNC][READ], 0, INT_MAX, 1);
- +STORE_FUNCTION(sio_sync_write_expire_store, &sd->fifo_expire[SYNC][WRITE], 0, INT_MAX, 1);
- +STORE_FUNCTION(sio_async_read_expire_store, &sd->fifo_expire[ASYNC][READ], 0, INT_MAX, 1);
- +STORE_FUNCTION(sio_async_write_expire_store, &sd->fifo_expire[ASYNC][WRITE], 0, INT_MAX, 1);
- +STORE_FUNCTION(sio_fifo_batch_store, &sd->fifo_batch, 0, INT_MAX, 0);
- +STORE_FUNCTION(sio_writes_starved_store, &sd->writes_starved, 0, INT_MAX, 0);
- +#undef STORE_FUNCTION
- +
- +#define DD_ATTR(name) \
- + __ATTR(name, S_IRUGO|S_IWUSR, sio_##name##_show, \
- + sio_##name##_store)
- +
- +static struct elv_fs_entry sio_attrs[] = {
- + DD_ATTR(sync_read_expire),
- + DD_ATTR(sync_write_expire),
- + DD_ATTR(async_read_expire),
- + DD_ATTR(async_write_expire),
- + DD_ATTR(fifo_batch),
- + DD_ATTR(writes_starved),
- + __ATTR_NULL
- +};
- +
- +static struct elevator_type iosched_sio = {
- + .ops = {
- + .elevator_merge_req_fn = sio_merged_requests,
- + .elevator_dispatch_fn = sio_dispatch_requests,
- + .elevator_add_req_fn = sio_add_request,
- +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,38)
- + .elevator_queue_empty_fn = sio_queue_empty,
- +#endif
- + .elevator_former_req_fn = sio_former_request,
- + .elevator_latter_req_fn = sio_latter_request,
- + .elevator_init_fn = sio_init_queue,
- + .elevator_exit_fn = sio_exit_queue,
- + },
- +
- + .elevator_attrs = sio_attrs,
- + .elevator_name = "sio",
- + .elevator_owner = THIS_MODULE,
- +};
- +
- +static int __init sio_init(void)
- +{
- + /* Register elevator */
- + elv_register(&iosched_sio);
- +
- + return 0;
- +}
- +
- +static void __exit sio_exit(void)
- +{
- + /* Unregister elevator */
- + elv_unregister(&iosched_sio);
- +}
- +
- +module_init(sio_init);
- +module_exit(sio_exit);
- +
- +MODULE_AUTHOR("Miguel Boton");
- +MODULE_LICENSE("GPL");
- +MODULE_DESCRIPTION("Simple IO scheduler");
- +MODULE_VERSION("0.2");
- +
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