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Fall back to sysconf to determine page size during runtime

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On some platforms the PAGE_SIZE macro does not exist so we can fall back
to `sysconf` to determine the page size at runtime.
This commit is contained in:
Peter Zhu 2021-05-05 21:06:56 +00:00
parent 23a98237df
commit b655a3fa5b
Notes: git 2021-05-06 06:54:48 +09:00 
Merged: https://github.com/ruby/ruby/pull/4462
1 changed files with 14 additions and 2 deletions
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16
gc.c
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@ -835,10 +835,12 @@ enum {
#define HEAP_PAGE_ALIGN (1 << HEAP_PAGE_ALIGN_LOG)
#define HEAP_PAGE_SIZE HEAP_PAGE_ALIGN
#if defined(HAVE_MMAP) && defined(PAGE_SIZE)
#ifdef HAVE_MMAP
# if HAVE_CONST_PAGE_SIZE
/* If we have the HEAP_PAGE and it is a constant, then we can directly use it. */
# define USE_MMAP_ALIGNED_ALLOC (PAGE_SIZE <= HEAP_PAGE_SIZE)
# else
/* Otherwise, fall back to determining if we can use mmap during runtime. */
# define USE_MMAP_ALIGNED_ALLOC (use_mmap_aligned_alloc != false)
static bool use_mmap_aligned_alloc;
@ -3208,8 +3210,18 @@ Init_heap(void)
{
rb_objspace_t *objspace = &rb_objspace;
#if defined(HAVE_MMAP) && defined(PAGE_SIZE) && !HAVE_CONST_PAGE_SIZE
#if defined(HAVE_MMAP) && !HAVE_CONST_PAGE_SIZE
/* Need to determine if we can use mmap at runtime. */
# ifdef PAGE_SIZE
/* If the PAGE_SIZE macro can be used. */
use_mmap_aligned_alloc = PAGE_SIZE <= HEAP_PAGE_SIZE;
# elif defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
/* If we can use sysconf to determine the page size. */
use_mmap_aligned_alloc = sysconf(_SC_PAGE_SIZE) <= HEAP_PAGE_SIZE;
# else
/* Otherwise we can't determine the system page size, so don't use mmap. */
use_mmap_aligned_alloc = FALSE;
# endif
#endif
#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)