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rtems-kernel-page: Reclaim pages earlier

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This commit is contained in:
Sebastian Huber 2016-11-21 14:57:57 +01:00
parent 7533adcf09
commit 91fb6e3753
1 changed files with 13 additions and 9 deletions
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22
rtemsbsd/rtems/rtems-kernel-page.c
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@ -61,21 +61,24 @@ uintptr_t rtems_bsd_page_area_begin;
static struct {
struct mtx mtx;
rtems_rbheap_control heap;
size_t used;
size_t free;
uint32_t reclaims;
} page_alloc;
void *
rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait)
rtems_bsd_page_alloc(uintptr_t size_in_bytes, int flags)
{
void *addr;
mtx_lock(&page_alloc.mtx);
addr = rtems_rbheap_allocate(&page_alloc.heap, size_in_bytes);
if (addr == NULL && wait) {
if (addr == NULL && ((flags & M_WAITOK) != 0 ||
page_alloc.free < 32)) {
int i;
for (i = 0; i < 8; i++) {
++page_alloc.reclaims;
mtx_unlock(&page_alloc.mtx);
uma_reclaim();
mtx_lock(&page_alloc.mtx);
@ -89,19 +92,19 @@ rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait)
"page alloc", (hz / 4) * (i + 1));
}
if (i == 8) {
if (addr == NULL && (flags & M_WAITOK) != 0) {
panic("rtems_bsd_page_alloc: page starvation");
}
}
page_alloc.used += (addr != NULL) ? 1 : 0;
page_alloc.free -= (addr != NULL) ? 1 : 0;
mtx_unlock(&page_alloc.mtx);
#ifdef INVARIANTS
wait |= M_ZERO;
flags |= M_ZERO;
#endif
if (addr != NULL && (wait & M_ZERO) != 0) {
if (addr != NULL && (flags & M_ZERO) != 0) {
memset(addr, 0, size_in_bytes);
}
@ -113,7 +116,7 @@ rtems_bsd_page_free(void *addr)
{
mtx_lock(&page_alloc.mtx);
--page_alloc.used;
++page_alloc.free;
rtems_rbheap_free(&page_alloc.heap, addr);
wakeup(&page_alloc.heap);
mtx_unlock(&page_alloc.mtx);
@ -130,7 +133,7 @@ rtems_bsd_page_init(void *arg)
size_t n;
uintptr_t heap_size;
mtx_init(&page_alloc.mtx, "page heap", NULL, MTX_DEF);
mtx_init(&page_alloc.mtx, "page heap", NULL, MTX_RECURSE);
heap_size = rtems_bsd_get_allocator_domain_size(
RTEMS_BSD_ALLOCATOR_DOMAIN_PAGE);
@ -147,6 +150,7 @@ rtems_bsd_page_init(void *arg)
rtems_rbheap_extend_descriptors_never);
n = heap_size / PAGE_SIZE;
page_alloc.free = n;
chunks = malloc(n * sizeof(*chunks), M_RTEMS_HEAP, M_NOWAIT);
BSD_ASSERT(chunks != NULL);