return pool_elt_at_index (pp->chunks, index);
}
+static inline uword
+pmalloc_size2pages (uword size, u32 log2_page_sz)
+{
+ return round_pow2 (size, 1ULL << log2_page_sz) >> log2_page_sz;
+}
+
static inline int
pmalloc_validate_numa_node (u32 * numa_node)
{
ASSERT (pm->error == 0);
pagesize = clib_mem_get_default_hugepage_size ();
- pm->log2_page_sz = min_log2 (pagesize);
+ pm->def_log2_page_sz = min_log2 (pagesize);
+ pm->sys_log2_page_sz = min_log2 (sysconf (_SC_PAGESIZE));
+ pm->lookup_log2_page_sz = pm->def_log2_page_sz;
size = size ? size : ((u64) DEFAULT_RESERVED_MB) << 20;
size = round_pow2 (size, pagesize);
- pm->max_pages = size >> pm->log2_page_sz;
+ pm->max_pages = size >> pm->def_log2_page_sz;
/* reserve VA space for future growth */
pm->base = mmap (0, size + pagesize, PROT_NONE,
alloc_chunk_from_page (clib_pmalloc_main_t * pm, clib_pmalloc_page_t * pp,
u32 n_blocks, u32 block_align, u32 numa_node)
{
- clib_pmalloc_chunk_t *c;
+ clib_pmalloc_chunk_t *c = 0;
+ clib_pmalloc_arena_t *a;
void *va;
u32 off;
u32 alloc_chunk_index;
+ a = pool_elt_at_index (pm->arenas, pp->arena_index);
+
if (pp->chunks == 0)
{
- pool_get (pp->chunks, c);
- pp->n_free_chunks = 1;
- pp->first_chunk_index = c - pp->chunks;
- c->prev = c->next = ~0;
- c->size = pp->n_free_blocks;
+ u32 i, start = 0, prev = ~0;
+
+ for (i = 0; i < a->subpages_per_page; i++)
+ {
+ pool_get (pp->chunks, c);
+ c->start = start;
+ c->prev = prev;
+ c->size = pp->n_free_blocks / a->subpages_per_page;
+ start += c->size;
+ if (prev == ~0)
+ pp->first_chunk_index = c - pp->chunks;
+ else
+ pp->chunks[prev].next = c - pp->chunks;
+ prev = c - pp->chunks;
+ }
+ c->next = ~0;
+ pp->n_free_chunks = a->subpages_per_page;
}
alloc_chunk_index = pp->first_chunk_index;
pool_elt_at_index (pp->chunks, c->next)->prev = alloc_chunk_index;
c = get_chunk (pp, alloc_chunk_index);
- va = pm->base + ((pp - pm->pages) << pm->log2_page_sz) +
+ va = pm->base + ((pp - pm->pages) << pm->def_log2_page_sz) +
(c->start << PMALLOC_LOG2_BLOCK_SZ);
hash_set (pm->chunk_index_by_va, pointer_to_uword (va), alloc_chunk_index);
pp->n_free_blocks -= n_blocks;
return va;
}
+static void
+pmalloc_update_lookup_table (clib_pmalloc_main_t * pm, u32 first, u32 count)
+{
+ uword seek, va, pa, p;
+ int fd;
+ u32 elts_per_page = 1U << (pm->def_log2_page_sz - pm->lookup_log2_page_sz);
+
+ vec_validate_aligned (pm->lookup_table, vec_len (pm->pages) *
+ elts_per_page - 1, CLIB_CACHE_LINE_BYTES);
+
+ fd = open ((char *) "/proc/self/pagemap", O_RDONLY);
+
+ p = first * elts_per_page;
+ while (p < elts_per_page * count)
+ {
+ va = pointer_to_uword (pm->base) + (p << pm->lookup_log2_page_sz);
+ seek = (va >> pm->sys_log2_page_sz) * sizeof (pa);
+ if (fd != -1 && lseek (fd, seek, SEEK_SET) == seek &&
+ read (fd, &pa, sizeof (pa)) == (sizeof (pa)) &&
+ pa & (1ULL << 63) /* page present bit */ )
+ {
+ pa = (pa & pow2_mask (55)) << pm->sys_log2_page_sz;
+ }
+ pm->lookup_table[p] = va - pa;
+ p++;
+ }
+
+ if (fd != -1)
+ close (fd);
+}
+
static inline clib_pmalloc_page_t *
pmalloc_map_pages (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
u32 numa_node, u32 n_pages)
{
clib_pmalloc_page_t *pp = 0;
- u64 seek, pa, sys_page_size;
- int pagemap_fd, status, rv, i, mmap_flags;
+ int status, rv, i, mmap_flags;
void *va;
int old_mpol = -1;
long unsigned int mask[16] = { 0 };
long unsigned int old_mask[16] = { 0 };
+ uword size = (uword) n_pages << pm->def_log2_page_sz;
clib_error_free (pm->error);
return 0;
}
- pm->error = clib_sysfs_prealloc_hugepages (numa_node, pm->log2_page_sz,
- n_pages);
+ if (a->log2_subpage_sz != pm->sys_log2_page_sz)
+ {
+ pm->error = clib_sysfs_prealloc_hugepages (numa_node,
+ a->log2_subpage_sz, n_pages);
- if (pm->error)
- return 0;
+ if (pm->error)
+ return 0;
+ }
rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1, 0, 0);
/* failure to get mempolicy means we can only proceed with numa 0 maps */
return 0;
}
- mmap_flags = MAP_FIXED | MAP_HUGETLB | MAP_LOCKED | MAP_ANONYMOUS;
+ mmap_flags = MAP_FIXED | MAP_ANONYMOUS | MAP_LOCKED;
+
+ if (a->log2_subpage_sz != pm->sys_log2_page_sz)
+ mmap_flags |= MAP_HUGETLB;
+
if (a->flags & CLIB_PMALLOC_ARENA_F_SHARED_MEM)
{
mmap_flags |= MAP_SHARED;
- pm->error = clib_mem_create_hugetlb_fd ((char *) a->name, &a->fd);
+ if (mmap_flags & MAP_HUGETLB)
+ pm->error = clib_mem_create_hugetlb_fd ((char *) a->name, &a->fd);
+ else
+ pm->error = clib_mem_create_fd ((char *) a->name, &a->fd);
if (a->fd == -1)
goto error;
}
a->fd = -1;
}
- va = pm->base + (vec_len (pm->pages) << pm->log2_page_sz);
- if (mmap (va, n_pages << pm->log2_page_sz, PROT_READ | PROT_WRITE,
- mmap_flags, a->fd, 0) == MAP_FAILED)
+ va = pm->base + (((uword) vec_len (pm->pages)) << pm->def_log2_page_sz);
+ if (mmap (va, size, PROT_READ | PROT_WRITE, mmap_flags, a->fd, 0) ==
+ MAP_FAILED)
{
pm->error = clib_error_return_unix (0, "failed to mmap %u pages at %p "
"fd %d numa %d flags 0x%x", n_pages,
goto error;
}
+ clib_memset (va, 0, size);
+
rv = set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1);
if (rv == -1 && numa_node != 0)
{
"%u status %d", numa_node, status);
/* unmap & reesrve */
- munmap (va, n_pages << pm->log2_page_sz);
- mmap (va, n_pages << pm->log2_page_sz, PROT_NONE,
- MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ munmap (va, size);
+ mmap (va, size, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
goto error;
}
- clib_memset (va, 0, n_pages << pm->log2_page_sz);
- sys_page_size = sysconf (_SC_PAGESIZE);
- pagemap_fd = open ((char *) "/proc/self/pagemap", O_RDONLY);
-
for (i = 0; i < n_pages; i++)
{
- uword page_va = pointer_to_uword ((u8 *) va + (i << pm->log2_page_sz));
vec_add2 (pm->pages, pp, 1);
- pp->n_free_blocks = 1 << (pm->log2_page_sz - PMALLOC_LOG2_BLOCK_SZ);
+ pp->n_free_blocks = 1 << (pm->def_log2_page_sz - PMALLOC_LOG2_BLOCK_SZ);
pp->index = pp - pm->pages;
pp->arena_index = a->index;
-
vec_add1 (a->page_indices, pp->index);
a->n_pages++;
-
- seek = (page_va / sys_page_size) * sizeof (pa);
- if (pagemap_fd != -1 &&
- lseek (pagemap_fd, seek, SEEK_SET) == seek &&
- read (pagemap_fd, &pa, sizeof (pa)) == (sizeof (pa)) &&
- pa & (1ULL << 63) /* page present bit */ )
- {
- pp->pa = (pa & pow2_mask (55)) * sys_page_size;
- }
- vec_add1_aligned (pm->va_pa_diffs, pp->pa ? page_va - pp->pa : 0,
- CLIB_CACHE_LINE_BYTES);
}
- if (pagemap_fd != -1)
- close (pagemap_fd);
+
+ /* if new arena is using smaller page size, we need to rebuild whole
+ lookup table */
+ if (a->log2_subpage_sz < pm->lookup_log2_page_sz)
+ {
+ pm->lookup_log2_page_sz = a->log2_subpage_sz;
+ pmalloc_update_lookup_table (pm, vec_len (pm->pages) - n_pages,
+ n_pages);
+ }
+ else
+ pmalloc_update_lookup_table (pm, 0, vec_len (pm->pages));
/* return pointer to 1st page */
return pp - (n_pages - 1);
void *
clib_pmalloc_create_shared_arena (clib_pmalloc_main_t * pm, char *name,
- uword size, u32 numa_node)
+ uword size, u32 log2_page_sz, u32 numa_node)
{
clib_pmalloc_arena_t *a;
clib_pmalloc_page_t *pp;
- u32 n_pages = round_pow2 (size, 1ULL << pm->log2_page_sz) >>
- pm->log2_page_sz;
+ u32 n_pages;
+
+ clib_error_free (pm->error);
+
+ if (log2_page_sz == 0)
+ log2_page_sz = pm->def_log2_page_sz;
+ else if (log2_page_sz != pm->def_log2_page_sz &&
+ log2_page_sz != pm->sys_log2_page_sz)
+ {
+ pm->error = clib_error_create ("unsupported page size (%uKB)",
+ 1 << (log2_page_sz - 10));
+ return 0;
+ }
+
+ n_pages = pmalloc_size2pages (size, pm->def_log2_page_sz);
if (n_pages + vec_len (pm->pages) > pm->max_pages)
return 0;
a->name = format (0, "%s%c", name, 0);
a->numa_node = numa_node;
a->flags = CLIB_PMALLOC_ARENA_F_SHARED_MEM;
- a->log2_page_sz = pm->log2_page_sz;
+ a->log2_subpage_sz = log2_page_sz;
+ a->subpages_per_page = 1U << (pm->def_log2_page_sz - log2_page_sz);
if ((pp = pmalloc_map_pages (pm, a, numa_node, n_pages)) == 0)
{
return 0;
}
- return pm->base + (pp->index << pm->log2_page_sz);
+ return pm->base + (pp->index << pm->def_log2_page_sz);
}
static inline void *
if (a == 0)
{
+ if (size > 1ULL << pm->def_log2_page_sz)
+ return 0;
+
vec_validate_init_empty (pm->default_arena_for_numa_node,
numa_node, ~0);
if (pm->default_arena_for_numa_node[numa_node] == ~0)
pm->default_arena_for_numa_node[numa_node] = a - pm->arenas;
a->name = format (0, "default-numa-%u%c", numa_node, 0);
a->numa_node = numa_node;
+ a->log2_subpage_sz = pm->def_log2_page_sz;
+ a->subpages_per_page = 1;
}
else
a = pool_elt_at_index (pm->arenas,
pm->default_arena_for_numa_node[numa_node]);
}
+ else if (size > 1ULL << a->log2_subpage_sz)
+ return 0;
n_blocks = round_pow2 (size, PMALLOC_BLOCK_SZ) / PMALLOC_BLOCK_SZ;
block_align = align >> PMALLOC_LOG2_BLOCK_SZ;
return clib_pmalloc_alloc_inline (pm, a, size, align, 0);
}
+static inline int
+pmalloc_chunks_mergeable (clib_pmalloc_arena_t * a, clib_pmalloc_page_t * pp,
+ u32 ci1, u32 ci2)
+{
+ clib_pmalloc_chunk_t *c1, *c2;
+
+ if (ci1 == ~0 || ci2 == ~0)
+ return 0;
+
+ c1 = get_chunk (pp, ci1);
+ c2 = get_chunk (pp, ci2);
+
+ if (c1->used || c2->used)
+ return 0;
+
+ if (c1->start >> (a->log2_subpage_sz - PMALLOC_LOG2_BLOCK_SZ) !=
+ c2->start >> (a->log2_subpage_sz - PMALLOC_LOG2_BLOCK_SZ))
+ return 0;
+
+ return 1;
+}
+
void
clib_pmalloc_free (clib_pmalloc_main_t * pm, void *va)
{
clib_pmalloc_page_t *pp;
clib_pmalloc_chunk_t *c;
+ clib_pmalloc_arena_t *a;
uword *p;
u32 chunk_index, page_index;
pp = vec_elt_at_index (pm->pages, page_index);
c = pool_elt_at_index (pp->chunks, chunk_index);
+ a = pool_elt_at_index (pm->arenas, pp->arena_index);
c->used = 0;
pp->n_free_blocks += c->size;
pp->n_free_chunks++;
/* merge with next if free */
- if (c->next != ~0 && get_chunk (pp, c->next)->used == 0)
+ if (pmalloc_chunks_mergeable (a, pp, chunk_index, c->next))
{
clib_pmalloc_chunk_t *next = get_chunk (pp, c->next);
c->size += next->size;
}
/* merge with prev if free */
- if (c->prev != ~0 && get_chunk (pp, c->prev)->used == 0)
+ if (pmalloc_chunks_mergeable (a, pp, c->prev, chunk_index))
{
clib_pmalloc_chunk_t *prev = get_chunk (pp, c->prev);
prev->size += c->size;
}
}
+static u8 *
+format_log2_page_size (u8 * s, va_list * va)
+{
+ u32 log2_page_sz = va_arg (*va, u32);
+
+ if (log2_page_sz >= 30)
+ return format (s, "%uGB", 1 << (log2_page_sz - 30));
+
+ if (log2_page_sz >= 20)
+ return format (s, "%uMB", 1 << (log2_page_sz - 20));
+
+ if (log2_page_sz >= 10)
+ return format (s, "%uKB", 1 << (log2_page_sz - 10));
+
+ return format (s, "%uB", 1 << log2_page_sz);
+}
+
+
static u8 *
format_pmalloc_page (u8 * s, va_list * va)
{
clib_pmalloc_page_t *pp;
clib_pmalloc_arena_t *a;
- s = format (s, "used-pages %u reserved-pages %u pagesize %uKB",
- vec_len (pm->pages), pm->max_pages,
- 1 << (pm->log2_page_sz - 10));
+ s = format (s, "used-pages %u reserved-pages %u default-page-size %U "
+ "lookup-page-size %U", vec_len (pm->pages), pm->max_pages,
+ format_log2_page_size, pm->def_log2_page_sz,
+ format_log2_page_size, pm->lookup_log2_page_sz);
+
if (verbose >= 2)
s = format (s, " va-start %p", pm->base);
pool_foreach (a, pm->arenas,
{
u32 *page_index;
- s = format (s, "\n%Uarena '%s' pages %u numa-node %u",
- format_white_space, indent + 2,
- a->name, vec_len (a->page_indices), a->numa_node);
+ s = format (s, "\n%Uarena '%s' pages %u subpage-size %U numa-node %u",
+ format_white_space, indent + 2, a->name,
+ vec_len (a->page_indices), format_log2_page_size,
+ a->log2_subpage_sz, a->numa_node);
if (a->fd != -1)
s = format (s, " shared fd %d", a->fd);
if (verbose >= 1)
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