Reviewed-and-tested-by: Yi He <yi...@linaro.org>
On 8 December 2016 at 19:04, Petri Savolainen <petri.savolai...@nokia.com>
wrote:
> Improve scalability by replacing lock protected linked list
> with a ring. Schedule group supported was updated also, since
> ring does not support peek of the head item.
>
> Signed-off-by: Petri Savolainen <petri.savolai...@nokia.com>
> ---
> platform/linux-generic/odp_schedule_sp.c | 271
> +++++++++++++++++++++++--------
> 1 file changed, 199 insertions(+), 72 deletions(-)
>
> diff --git a/platform/linux-generic/odp_schedule_sp.c
> b/platform/linux-generic/odp_schedule_sp.c
> index 76d1357..5150d28 100644
> --- a/platform/linux-generic/odp_schedule_sp.c
> +++ b/platform/linux-generic/odp_schedule_sp.c
> @@ -13,9 +13,12 @@
> #include <odp_debug_internal.h>
> #include <odp_align_internal.h>
> #include <odp_config_internal.h>
> +#include <odp_ring_internal.h>
>
> +#define NUM_THREAD ODP_THREAD_COUNT_MAX
> #define NUM_QUEUE ODP_CONFIG_QUEUES
> #define NUM_PKTIO ODP_CONFIG_PKTIO_ENTRIES
> +#define NUM_ORDERED_LOCKS 1
> #define NUM_PRIO 3
> #define NUM_STATIC_GROUP 3
> #define NUM_GROUP (NUM_STATIC_GROUP + 9)
> @@ -28,9 +31,17 @@
> #define GROUP_ALL ODP_SCHED_GROUP_ALL
> #define GROUP_WORKER ODP_SCHED_GROUP_WORKER
> #define GROUP_CONTROL ODP_SCHED_GROUP_CONTROL
> -#define MAX_ORDERED_LOCKS_PER_QUEUE 1
> +#define GROUP_PKTIN GROUP_ALL
>
> -ODP_STATIC_ASSERT(MAX_ORDERED_LOCKS_PER_QUEUE <=
> CONFIG_QUEUE_MAX_ORD_LOCKS,
> +/* Maximum number of commands: one priority/group for all queues and
> pktios */
> +#define RING_SIZE (ODP_ROUNDUP_POWER_2(NUM_QUEUE + NUM_PKTIO))
> +#define RING_MASK (RING_SIZE - 1)
> +
> +/* Ring size must be power of two */
> +ODP_STATIC_ASSERT(ODP_VAL_IS_POWER_2(RING_SIZE),
> + "Ring_size_is_not_power_of_two");
> +
> +ODP_STATIC_ASSERT(NUM_ORDERED_LOCKS <= CONFIG_QUEUE_MAX_ORD_LOCKS,
> "Too_many_ordered_locks");
>
> struct sched_cmd_t;
> @@ -38,6 +49,7 @@ struct sched_cmd_t;
> struct sched_cmd_s {
> struct sched_cmd_t *next;
> uint32_t index;
> + uint32_t ring_idx;
> int type;
> int prio;
> int group;
> @@ -52,38 +64,49 @@ typedef struct sched_cmd_t {
> sizeof(struct sched_cmd_s)];
> } sched_cmd_t ODP_ALIGNED_CACHE;
>
> -struct prio_queue_s {
> - odp_ticketlock_t lock;
> - sched_cmd_t *head;
> - sched_cmd_t *tail;
> -};
> +typedef struct {
> + /* Ring header */
> + ring_t ring;
> +
> + /* Ring data: queue indexes */
> + uint32_t ring_idx[RING_SIZE];
>
> -typedef struct prio_queue_t {
> - struct prio_queue_s s;
> - uint8_t pad[ROUNDUP_CACHE(sizeof(struct
> prio_queue_s)) -
> - sizeof(struct prio_queue_s)];
> } prio_queue_t ODP_ALIGNED_CACHE;
>
> -struct sched_group_s {
> - odp_ticketlock_t lock;
> +typedef struct thr_group_t {
> + /* A generation counter for fast comparison if groups have changed
> */
> + odp_atomic_u32_t gen_cnt;
>
> - struct {
> - char name[ODP_SCHED_GROUP_NAME_LEN + 1];
> - odp_thrmask_t mask;
> - int allocated;
> - } group[NUM_GROUP];
> -};
> + /* Number of groups the thread belongs to */
> + int num_group;
> +
> + /* The groups the thread belongs to */
> + int group[NUM_GROUP];
> +
> +} thr_group_t;
>
> typedef struct sched_group_t {
> - struct sched_group_s s;
> - uint8_t pad[ROUNDUP_CACHE(sizeof(struct
> sched_group_s)) -
> - sizeof(struct sched_group_s)];
> + struct {
> + odp_ticketlock_t lock;
> +
> + /* All groups */
> + struct {
> + char name[ODP_SCHED_GROUP_NAME_LEN + 1];
> + odp_thrmask_t mask;
> + int allocated;
> + } group[NUM_GROUP];
> +
> + /* Per thread group information */
> + thr_group_t thr[NUM_THREAD];
> +
> + } s;
> +
> } sched_group_t ODP_ALIGNED_CACHE;
>
> typedef struct {
> sched_cmd_t queue_cmd[NUM_QUEUE];
> sched_cmd_t pktio_cmd[NUM_PKTIO];
> - prio_queue_t prio_queue[NUM_PRIO];
> + prio_queue_t prio_queue[NUM_GROUP][NUM_PRIO];
> sched_group_t sched_group;
> } sched_global_t;
>
> @@ -91,14 +114,37 @@ typedef struct {
> sched_cmd_t *cmd;
> int pause;
> int thr_id;
> + uint32_t gen_cnt;
> + int num_group;
> + int group[NUM_GROUP];
> } sched_local_t;
>
> static sched_global_t sched_global;
> static __thread sched_local_t sched_local;
>
> +static inline uint32_t index_to_ring_idx(int pktio, uint32_t index)
> +{
> + if (pktio)
> + return (0x80000000 | index);
> +
> + return index;
> +}
> +
> +static inline uint32_t index_from_ring_idx(uint32_t *index, uint32_t
> ring_idx)
> +{
> + uint32_t pktio = ring_idx & 0x80000000;
> +
> + if (pktio)
> + *index = ring_idx & (~0x80000000);
> + else
> + *index = ring_idx;
> +
> + return pktio;
> +}
> +
> static int init_global(void)
> {
> - int i;
> + int i, j;
> sched_group_t *sched_group = &sched_global.sched_group;
>
> ODP_DBG("Using SP scheduler\n");
> @@ -106,21 +152,28 @@ static int init_global(void)
> memset(&sched_global, 0, sizeof(sched_global_t));
>
> for (i = 0; i < NUM_QUEUE; i++) {
> - sched_global.queue_cmd[i].s.type = CMD_QUEUE;
> - sched_global.queue_cmd[i].s.index = i;
> + sched_global.queue_cmd[i].s.type = CMD_QUEUE;
> + sched_global.queue_cmd[i].s.index = i;
> + sched_global.queue_cmd[i].s.ring_idx =
> index_to_ring_idx(0, i);
> }
>
> for (i = 0; i < NUM_PKTIO; i++) {
> - sched_global.pktio_cmd[i].s.type = CMD_PKTIO;
> - sched_global.pktio_cmd[i].s.index = i;
> - sched_global.pktio_cmd[i].s.prio = PKTIN_PRIO;
> + sched_global.pktio_cmd[i].s.type = CMD_PKTIO;
> + sched_global.pktio_cmd[i].s.index = i;
> + sched_global.pktio_cmd[i].s.ring_idx =
> index_to_ring_idx(1, i);
> + sched_global.pktio_cmd[i].s.prio = PKTIN_PRIO;
> + sched_global.pktio_cmd[i].s.group = GROUP_PKTIN;
> }
>
> - for (i = 0; i < NUM_PRIO; i++)
> - odp_ticketlock_init(&sched_global.prio_queue[i].s.lock);
> + for (i = 0; i < NUM_GROUP; i++)
> + for (j = 0; j < NUM_PRIO; j++)
> + ring_init(&sched_global.prio_queue[i][j].ring);
>
> odp_ticketlock_init(&sched_group->s.lock);
>
> + for (i = 0; i < NUM_THREAD; i++)
> + odp_atomic_init_u32(&sched_group->s.thr[i].gen_cnt, 0);
> +
> strncpy(sched_group->s.group[GROUP_ALL].name, "__group_all",
> ODP_SCHED_GROUP_NAME_LEN);
> odp_thrmask_zero(&sched_group->s.group[GROUP_ALL].mask);
> @@ -168,7 +221,48 @@ static int term_local(void)
>
> static unsigned max_ordered_locks(void)
> {
> - return MAX_ORDERED_LOCKS_PER_QUEUE;
> + return NUM_ORDERED_LOCKS;
> +}
> +
> +static void add_group(sched_group_t *sched_group, int thr, int group)
> +{
> + int num;
> + uint32_t gen_cnt;
> + thr_group_t *thr_group = &sched_group->s.thr[thr];
> +
> + num = thr_group->num_group;
> + thr_group->group[num] = group;
> + thr_group->num_group = num + 1;
> + gen_cnt = odp_atomic_load_u32(&thr_group->gen_cnt);
> + odp_atomic_store_u32(&thr_group->gen_cnt, gen_cnt + 1);
> +}
> +
> +static void remove_group(sched_group_t *sched_group, int thr, int group)
> +{
> + int i, num;
> + int found = 0;
> + thr_group_t *thr_group = &sched_group->s.thr[thr];
> +
> + num = thr_group->num_group;
> +
> + for (i = 0; i < num; i++) {
> + if (thr_group->group[i] == group) {
> + found = 1;
> +
> + for (; i < num - 1; i++)
> + thr_group->group[i] = thr_group->group[i +
> 1];
> +
> + break;
> + }
> + }
> +
> + if (found) {
> + uint32_t gen_cnt;
> +
> + thr_group->num_group = num - 1;
> + gen_cnt = odp_atomic_load_u32(&thr_group->gen_cnt);
> + odp_atomic_store_u32(&thr_group->gen_cnt, gen_cnt + 1);
> + }
> }
>
> static int thr_add(odp_schedule_group_t group, int thr)
> @@ -178,6 +272,9 @@ static int thr_add(odp_schedule_group_t group, int thr)
> if (group < 0 || group >= NUM_GROUP)
> return -1;
>
> + if (thr < 0 || thr >= NUM_THREAD)
> + return -1;
> +
> odp_ticketlock_lock(&sched_group->s.lock);
>
> if (!sched_group->s.group[group].allocated) {
> @@ -186,6 +283,7 @@ static int thr_add(odp_schedule_group_t group, int thr)
> }
>
> odp_thrmask_set(&sched_group->s.group[group].mask, thr);
> + add_group(sched_group, thr, group);
>
> odp_ticketlock_unlock(&sched_group->s.lock);
>
> @@ -208,6 +306,8 @@ static int thr_rem(odp_schedule_group_t group, int thr)
>
> odp_thrmask_clr(&sched_group->s.group[group].mask, thr);
>
> + remove_group(sched_group, thr, group);
> +
> odp_ticketlock_unlock(&sched_group->s.lock);
>
> return 0;
> @@ -250,51 +350,34 @@ static void destroy_queue(uint32_t qi)
> static inline void add_tail(sched_cmd_t *cmd)
> {
> prio_queue_t *prio_queue;
> + int group = cmd->s.group;
> + int prio = cmd->s.prio;
> + uint32_t idx = cmd->s.ring_idx;
>
> - prio_queue = &sched_global.prio_queue[cmd->s.prio];
> - cmd->s.next = NULL;
> -
> - odp_ticketlock_lock(&prio_queue->s.lock);
> -
> - if (prio_queue->s.head == NULL)
> - prio_queue->s.head = cmd;
> - else
> - prio_queue->s.tail->s.next = cmd;
> -
> - prio_queue->s.tail = cmd;
> + prio_queue = &sched_global.prio_queue[group][prio];
>
> - odp_ticketlock_unlock(&prio_queue->s.lock);
> + ring_enq(&prio_queue->ring, RING_MASK, idx);
> }
>
> -static inline sched_cmd_t *rem_head(int prio)
> +static inline sched_cmd_t *rem_head(int group, int prio)
> {
> prio_queue_t *prio_queue;
> - sched_cmd_t *cmd;
> -
> - prio_queue = &sched_global.prio_queue[prio];
> + uint32_t ring_idx, index;
> + int pktio;
>
> - odp_ticketlock_lock(&prio_queue->s.lock);
> + prio_queue = &sched_global.prio_queue[group][prio];
>
> - if (prio_queue->s.head == NULL) {
> - cmd = NULL;
> - } else {
> - sched_group_t *sched_group = &sched_global.sched_group;
> + ring_idx = ring_deq(&prio_queue->ring, RING_MASK);
>
> - cmd = prio_queue->s.head;
> + if (ring_idx == RING_EMPTY)
> + return NULL;
>
> - /* Remove head cmd only if thread belongs to the
> - * scheduler group. Otherwise continue to the next priority
> - * queue. */
> - if (odp_thrmask_isset(&sched_group->s.group[cmd->s.group].
> mask,
> - sched_local.thr_id))
> - prio_queue->s.head = cmd->s.next;
> - else
> - cmd = NULL;
> - }
> + pktio = index_from_ring_idx(&index, ring_idx);
>
> - odp_ticketlock_unlock(&prio_queue->s.lock);
> + if (pktio)
> + return &sched_global.pktio_cmd[index];
>
> - return cmd;
> + return &sched_global.queue_cmd[index];
> }
>
> static int sched_queue(uint32_t qi)
> @@ -341,15 +424,43 @@ static void pktio_start(int pktio_index, int num,
> int pktin_idx[])
> add_tail(cmd);
> }
>
> -static inline sched_cmd_t *sched_cmd(int num_prio)
> +static inline sched_cmd_t *sched_cmd(void)
> {
> - int prio;
> + int prio, i;
> + int thr = sched_local.thr_id;
> + sched_group_t *sched_group = &sched_global.sched_group;
> + thr_group_t *thr_group = &sched_group->s.thr[thr];
> + uint32_t gen_cnt;
> +
> + /* There's no matching store_rel since the value is updated while
> + * holding a lock */
> + gen_cnt = odp_atomic_load_acq_u32(&thr_group->gen_cnt);
> +
> + /* Check if groups have changed and need to be read again */
> + if (odp_unlikely(gen_cnt != sched_local.gen_cnt)) {
> + int num_grp;
> +
> + odp_ticketlock_lock(&sched_group->s.lock);
> +
> + num_grp = thr_group->num_group;
> + gen_cnt = odp_atomic_load_u32(&thr_group->gen_cnt);
>
> - for (prio = 0; prio < num_prio; prio++) {
> - sched_cmd_t *cmd = rem_head(prio);
> + for (i = 0; i < num_grp; i++)
> + sched_local.group[i] = thr_group->group[i];
>
> - if (cmd)
> - return cmd;
> + odp_ticketlock_unlock(&sched_group->s.lock);
> +
> + sched_local.num_group = num_grp;
> + sched_local.gen_cnt = gen_cnt;
> + }
> +
> + for (i = 0; i < sched_local.num_group; i++) {
> + for (prio = 0; prio < NUM_PRIO; prio++) {
> + sched_cmd_t *cmd = rem_head(sched_local.group[i],
> prio);
> +
> + if (cmd)
> + return cmd;
> + }
> }
>
> return NULL;
> @@ -382,7 +493,7 @@ static int schedule_multi(odp_queue_t *from, uint64_t
> wait,
> uint32_t qi;
> int num;
>
> - cmd = sched_cmd(NUM_PRIO);
> + cmd = sched_cmd();
>
> if (cmd && cmd->s.type == CMD_PKTIO) {
> if (sched_cb_pktin_poll(cmd->s.index,
> cmd->s.num_pktin,
> @@ -565,11 +676,14 @@ static odp_schedule_group_t
> schedule_group_lookup(const char *name)
> static int schedule_group_join(odp_schedule_group_t group,
> const odp_thrmask_t *thrmask)
> {
> + int thr;
> sched_group_t *sched_group = &sched_global.sched_group;
>
> if (group < 0 || group >= NUM_GROUP)
> return -1;
>
> + thr = odp_thrmask_first(thrmask);
> +
> odp_ticketlock_lock(&sched_group->s.lock);
>
> if (!sched_group->s.group[group].allocated) {
> @@ -581,6 +695,11 @@ static int schedule_group_join(odp_schedule_group_t
> group,
> &sched_group->s.group[group].mask,
> thrmask);
>
> + while (thr >= 0) {
> + add_group(sched_group, thr, group);
> + thr = odp_thrmask_next(thrmask, thr);
> + }
> +
> odp_ticketlock_unlock(&sched_group->s.lock);
>
> return 0;
> @@ -589,6 +708,7 @@ static int schedule_group_join(odp_schedule_group_t
> group,
> static int schedule_group_leave(odp_schedule_group_t group,
> const odp_thrmask_t *thrmask)
> {
> + int thr;
> sched_group_t *sched_group = &sched_global.sched_group;
> odp_thrmask_t *all = &sched_group->s.group[GROUP_ALL].mask;
> odp_thrmask_t not;
> @@ -596,6 +716,8 @@ static int schedule_group_leave(odp_schedule_group_t
> group,
> if (group < 0 || group >= NUM_GROUP)
> return -1;
>
> + thr = odp_thrmask_first(thrmask);
> +
> odp_ticketlock_lock(&sched_group->s.lock);
>
> if (!sched_group->s.group[group].allocated) {
> @@ -608,6 +730,11 @@ static int schedule_group_leave(odp_schedule_group_t
> group,
> &sched_group->s.group[group].mask,
> ¬);
>
> + while (thr >= 0) {
> + remove_group(sched_group, thr, group);
> + thr = odp_thrmask_next(thrmask, thr);
> + }
> +
> odp_ticketlock_unlock(&sched_group->s.lock);
>
> return 0;
> --
> 2.8.1
>
>
