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Directly mapped pages are kept for future use if temporarily not needed

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This commit is contained in:
Maria Matejka
2021-11-24 17:30:13 +01:00
committed by Maria Matejka
parent 9f24fef5e9
commit 644e9ca94e
3 changed files with 58 additions and 3 deletions
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53
sysdep/unix/alloc.c
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@@ -8,6 +8,8 @@
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/lists.h"
#include "lib/event.h"
#include <stdlib.h>
#include <unistd.h>
@@ -17,8 +19,17 @@
#endif
#ifdef HAVE_MMAP
#define KEEP_PAGES 512
static u64 page_size = 0;
static _Bool use_fake = 0;
uint pages_kept = 0;
static list pages_list;
static void cleanup_pages(void *data);
static event page_cleanup_event = { .hook = cleanup_pages };
#else
static const u64 page_size = 4096; /* Fake page size */
#endif
@@ -48,6 +59,15 @@ void *
alloc_page(void)
{
#ifdef HAVE_MMAP
if (pages_kept)
{
node *page = TAIL(pages_list);
rem_node(page);
pages_kept--;
memset(page, 0, get_page_size());
return page;
}
if (!use_fake)
{
void *ret = mmap(NULL, get_page_size(), PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
@@ -71,10 +91,39 @@ free_page(void *ptr)
#ifdef HAVE_MMAP
if (!use_fake)
{
if (munmap(ptr, get_page_size()) < 0)
bug("munmap(%p) failed: %m", ptr);
if (!pages_kept)
init_list(&pages_list);
memset(ptr, 0, sizeof(node));
add_tail(&pages_list, ptr);
if (++pages_kept > KEEP_PAGES)
ev_schedule(&page_cleanup_event);
}
else
#endif
free(ptr);
}
#ifdef HAVE_MMAP
static void
cleanup_pages(void *data UNUSED)
{
for (uint seen = 0; (pages_kept > KEEP_PAGES) && (seen < KEEP_PAGES); seen++)
{
void *ptr = HEAD(pages_list);
rem_node(ptr);
if (munmap(ptr, get_page_size()) == 0)
pages_kept--;
#ifdef ENOMEM
else if (errno == ENOMEM)
add_tail(&pages_list, ptr);
#endif
else
bug("munmap(%p) failed: %m", ptr);
}
if (pages_kept > KEEP_PAGES)
ev_schedule(&page_cleanup_event);
}
#endif