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Keeping un-unmmappable pages until they can be reused

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On Linux, munmap() may fail with ENOMEM when virtual memory is too
fragmented. Working this around by just keeping such blocks for future
use.
This commit is contained in:
Maria Matejka
2021-11-11 16:25:59 +01:00
parent 4f3fa1623f
commit 794a4eefa1
3 changed files with 59 additions and 8 deletions
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23
lib/resource.c
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@@ -60,7 +60,7 @@ static struct resclass pool_class = {
pool root_pool;
void *alloc_sys_page(void);
void free_sys_page(void *);
int free_sys_page(void *);
static int indent;
@@ -98,8 +98,10 @@ pool_free(resource *P)
if (p->pages)
{
ASSERT_DIE(!p->pages->used);
for (uint i=0; i<p->pages->free; i++)
for (uint i = 0; i < p->pages->free; i++)
free_sys_page(p->pages->ptr[i]);
free_sys_page(p->pages);
}
}
@@ -476,10 +478,19 @@ free_page(pool *p, void *ptr)
ASSERT_DIE(p->pages);
p->pages->used--;
if (p->pages->free >= POOL_PAGES_MAX)
return free_sys_page(ptr);
else
p->pages->ptr[p->pages->free++] = ptr;
ASSERT_DIE(p->pages->free <= POOL_PAGES_MAX);
if (p->pages->free == POOL_PAGES_MAX)
{
const unsigned long keep = POOL_PAGES_MAX / 4;
for (uint i = keep; i < p->pages->free; i++)
free_sys_page(p->pages->ptr[i]);
p->pages->free = keep;
}
p->pages->ptr[p->pages->free++] = ptr;
}