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rtems-kernel-page: Panic on recursive reclaim

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This commit is contained in:
Sebastian Huber
2016-11-10 10:38:04 +01:00
parent 6254bf40b3
commit 6517105094
1 changed files with 33 additions and 22 deletions
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55
rtemsbsd/rtems/rtems-kernel-page.c
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@@ -58,40 +58,51 @@ void **rtems_bsd_page_object_table;
uintptr_t rtems_bsd_page_area_begin; uintptr_t rtems_bsd_page_area_begin;
static rtems_rbheap_control page_heap; static struct {
struct mtx mtx;
struct mtx page_heap_mtx; rtems_rbheap_control heap;
bool reclaim_in_progress;
} page_alloc;
void * void *
rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait) rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait)
{ {
void *addr; void *addr;
mtx_lock(&page_heap_mtx); mtx_lock(&page_alloc.mtx);
addr = rtems_rbheap_allocate(&page_heap, size_in_bytes); addr = rtems_rbheap_allocate(&page_alloc.heap, size_in_bytes);
if (addr == NULL && wait) { if (addr == NULL && wait) {
int i; int i;
for (i = 0; i < 8; i++) { if (page_alloc.reclaim_in_progress) {
mtx_unlock(&page_heap_mtx); panic("rtems_bsd_page_alloc: recursive reclaim");
uma_reclaim(); }
mtx_lock(&page_heap_mtx);
addr = rtems_rbheap_allocate(&page_heap, size_in_bytes); page_alloc.reclaim_in_progress = true;
for (i = 0; i < 8; i++) {
mtx_unlock(&page_alloc.mtx);
uma_reclaim();
mtx_lock(&page_alloc.mtx);
addr = rtems_rbheap_allocate(&page_alloc.heap,
size_in_bytes);
if (addr != NULL) if (addr != NULL)
break; break;
msleep(&page_heap, &page_heap_mtx, 0, msleep(&page_alloc.heap, &page_alloc.mtx, 0,
"page alloc", (hz / 4) * (i + 1)); "page alloc", (hz / 4) * (i + 1));
} }
if (i == 8) { page_alloc.reclaim_in_progress = false;
if (addr == NULL) {
panic("rtems_bsd_page_alloc: page starvation"); panic("rtems_bsd_page_alloc: page starvation");
} }
} }
mtx_unlock(&page_heap_mtx); mtx_unlock(&page_alloc.mtx);
#ifdef INVARIANTS #ifdef INVARIANTS
if (addr != NULL) { if (addr != NULL) {
@@ -105,10 +116,10 @@ rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait)
void void
rtems_bsd_page_free(void *addr) rtems_bsd_page_free(void *addr)
{ {
mtx_lock(&page_heap_mtx); mtx_lock(&page_alloc.mtx);
rtems_rbheap_free(&page_heap, addr); rtems_rbheap_free(&page_alloc.heap, addr);
wakeup(&page_heap); wakeup(&page_alloc.heap);
mtx_unlock(&page_heap_mtx); mtx_unlock(&page_alloc.mtx);
} }
static void static void
@@ -122,7 +133,7 @@ rtems_bsd_page_init(void *arg)
size_t n; size_t n;
uintptr_t heap_size; uintptr_t heap_size;
mtx_init(&page_heap_mtx, "page heap", NULL, MTX_DEF); mtx_init(&page_alloc.mtx, "page heap", NULL, MTX_DEF);
heap_size = rtems_bsd_get_allocator_domain_size( heap_size = rtems_bsd_get_allocator_domain_size(
RTEMS_BSD_ALLOCATOR_DOMAIN_PAGE); RTEMS_BSD_ALLOCATOR_DOMAIN_PAGE);
@@ -131,11 +142,11 @@ rtems_bsd_page_init(void *arg)
0); 0);
BSD_ASSERT(area != NULL); BSD_ASSERT(area != NULL);
sc = rtems_rbheap_initialize(&page_heap, area, heap_size, PAGE_SIZE, sc = rtems_rbheap_initialize(&page_alloc.heap, area, heap_size,
rtems_rbheap_extend_descriptors_with_malloc, NULL); PAGE_SIZE, rtems_rbheap_extend_descriptors_with_malloc, NULL);
BSD_ASSERT(sc == RTEMS_SUCCESSFUL); BSD_ASSERT(sc == RTEMS_SUCCESSFUL);
rtems_rbheap_set_extend_descriptors(&page_heap, rtems_rbheap_set_extend_descriptors(&page_alloc.heap,
rtems_rbheap_extend_descriptors_never); rtems_rbheap_extend_descriptors_never);
n = heap_size / PAGE_SIZE; n = heap_size / PAGE_SIZE;
@@ -144,7 +155,7 @@ rtems_bsd_page_init(void *arg)
BSD_ASSERT(chunks != NULL); BSD_ASSERT(chunks != NULL);
for (i = 0; i < n; ++i) { for (i = 0; i < n; ++i) {
rtems_rbheap_add_to_spare_descriptor_chain(&page_heap, rtems_rbheap_add_to_spare_descriptor_chain(&page_alloc.heap,
&chunks[i]); &chunks[i]);
} }