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kernel: mem_slab: Optimize mem_slab_free

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Changed algorithm of checking for pending thread in mem_slab.
Check for pending thread now is done only if there is
no memory left.

Signed-off-by: Kamil Lazowski <Kamil.Lazowski@nordicsemi.no>
This commit is contained in:
Kamil Lazowski 2020-09-14 12:08:29 +02:00 • committed by Carles Cufí
commit 303fca9f2a
1 changed files with 13 additions and 10 deletions
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23
kernel/mem_slab.c
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@ -143,16 +143,19 @@ int k_mem_slab_alloc(struct k_mem_slab *slab, void **mem, k_timeout_t timeout)
void k_mem_slab_free(struct k_mem_slab *slab, void **mem) void k_mem_slab_free(struct k_mem_slab *slab, void **mem)
{ {
k_spinlock_key_t key = k_spin_lock(&lock); k_spinlock_key_t key = k_spin_lock(&lock);
struct k_thread *pending_thread = z_unpend_first_thread(&slab->wait_q);
if (pending_thread != NULL) { if (slab->free_list == NULL) {
z_thread_return_value_set_with_data(pending_thread, 0, *mem); struct k_thread *pending_thread = z_unpend_first_thread(&slab->wait_q);
z_ready_thread(pending_thread);
z_reschedule(&lock, key); if (pending_thread != NULL) {
} else { z_thread_return_value_set_with_data(pending_thread, 0, *mem);
**(char ***)mem = slab->free_list; z_ready_thread(pending_thread);
slab->free_list = *(char **)mem; z_reschedule(&lock, key);
slab->num_used--; return;
k_spin_unlock(&lock, key); }
} }
**(char ***) mem = slab->free_list;
slab->free_list = *(char **) mem;
slab->num_used--;
k_spin_unlock(&lock, key);
} }