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authorDamjan Marion <damarion@cisco.com>2018-09-30 18:26:20 +0200
committerDamjan Marion <dmarion@me.com>2018-10-23 14:21:10 +0000
commit68b4da67deb2e8ca224bb5abaeb9dbc7ae8e378c (patch)
treecd1ee2c463aefdb31c73665eafb876568054f49e /src/vppinfra/pmalloc.c
parentfc3b8b8ad08d2d4cc375149ecdc10c37d4a80940 (diff)
Numa-aware, growable physical memory allocator (pmalloc)
Change-Id: Ic4c46bc733afae8bf0d8146623ed15633928de30 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vppinfra/pmalloc.c')
-rw-r--r--src/vppinfra/pmalloc.c562
1 files changed, 562 insertions, 0 deletions
diff --git a/src/vppinfra/pmalloc.c b/src/vppinfra/pmalloc.c
new file mode 100644
index 00000000000..d354cce8a7d
--- /dev/null
+++ b/src/vppinfra/pmalloc.c
@@ -0,0 +1,562 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/mempolicy.h>
+#include <linux/memfd.h>
+
+#include <vppinfra/format.h>
+#include <vppinfra/linux/syscall.h>
+#include <vppinfra/linux/sysfs.h>
+#include <vppinfra/mem.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/pmalloc.h>
+
+#if __SIZEOF_POINTER__ >= 8
+#define DEFAULT_RESERVED_MB 16384
+#else
+#define DEFAULT_RESERVED_MB 256
+#endif
+
+static inline clib_pmalloc_chunk_t *
+get_chunk (clib_pmalloc_page_t * pp, u32 index)
+{
+ return pool_elt_at_index (pp->chunks, index);
+}
+
+static inline int
+pmalloc_validate_numa_node (u32 * numa_node)
+{
+ if (*numa_node == CLIB_PMALLOC_NUMA_LOCAL)
+ {
+ u32 cpu;
+ if (getcpu (&cpu, numa_node, 0) != 0)
+ return 1;
+ }
+ return 0;
+}
+
+int
+clib_pmalloc_init (clib_pmalloc_main_t * pm, uword size)
+{
+ struct stat st;
+ uword off, pagesize;
+ int fd;
+
+ ASSERT (pm->error == 0);
+
+ pm->log2_page_sz = 21;
+ pm->error = clib_mem_create_hugetlb_fd ("detect_hugepage_size", &fd);
+
+ if (pm->error)
+ return -1;
+
+ if (fd != -1)
+ {
+ if (fstat (fd, &st) == -1)
+ pm->log2_page_sz = min_log2 (st.st_blksize);
+ close (fd);
+ }
+
+ pagesize = 1ULL << pm->log2_page_sz;
+
+ size = size ? size : ((u64) DEFAULT_RESERVED_MB) << 20;
+ size = round_pow2 (size, pagesize);
+
+ pm->max_pages = size >> pm->log2_page_sz;
+
+ /* reserve VA space for future growth */
+ pm->base = mmap (0, size + pagesize, PROT_NONE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ if (pm->base == MAP_FAILED)
+ {
+ pm->error = clib_error_return_unix (0, "failed to reserve %u pages");
+ return -1;
+ }
+
+ off = round_pow2 (pointer_to_uword (pm->base), pagesize) -
+ pointer_to_uword (pm->base);
+
+ /* trim start and end of reservation to be page aligned */
+ if (off)
+ {
+ munmap (pm->base, off);
+ pm->base += off;
+ }
+
+ munmap (pm->base + (pm->max_pages * pagesize), pagesize - off);
+ return 0;
+}
+
+static inline void *
+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;
+ void *va;
+ u32 off;
+ u32 alloc_chunk_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;
+ }
+
+ alloc_chunk_index = pp->first_chunk_index;
+
+next_chunk:
+ c = pool_elt_at_index (pp->chunks, alloc_chunk_index);
+ off = (block_align - (c->start & (block_align - 1))) & (block_align - 1);
+
+ if (c->used || n_blocks + off > c->size)
+ {
+ if (c->next == ~0)
+ return 0;
+ alloc_chunk_index = c->next;
+ goto next_chunk;
+ }
+
+ /* if alignment is needed create new empty chunk */
+ if (off)
+ {
+ u32 offset_chunk_index;
+ clib_pmalloc_chunk_t *co;
+ pool_get (pp->chunks, c);
+ pp->n_free_chunks++;
+ offset_chunk_index = alloc_chunk_index;
+ alloc_chunk_index = c - pp->chunks;
+
+ co = pool_elt_at_index (pp->chunks, offset_chunk_index);
+ c->size = co->size - off;
+ c->next = co->next;
+ c->start = co->start + off;
+ c->prev = offset_chunk_index;
+ co->size = off;
+ co->next = alloc_chunk_index;
+ }
+
+ c->used = 1;
+ if (c->size > n_blocks)
+ {
+ u32 tail_chunk_index;
+ clib_pmalloc_chunk_t *ct;
+ pool_get (pp->chunks, ct);
+ pp->n_free_chunks++;
+ tail_chunk_index = ct - pp->chunks;
+ c = pool_elt_at_index (pp->chunks, alloc_chunk_index);
+ ct->size = c->size - n_blocks;
+ ct->next = c->next;
+ ct->prev = alloc_chunk_index;
+ ct->start = c->start + n_blocks;
+
+ c->size = n_blocks;
+ c->next = tail_chunk_index;
+ if (ct->next != ~0)
+ pool_elt_at_index (pp->chunks, ct->next)->prev = tail_chunk_index;
+ }
+ else if (c->next != ~0)
+ 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) +
+ (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;
+ pp->n_free_chunks--;
+ return va;
+}
+
+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;
+ void *va;
+ int old_mpol = -1;
+ long unsigned int mask[16] = { 0 };
+ long unsigned int old_mask[16] = { 0 };
+
+ clib_error_free (pm->error);
+
+ if (pm->max_pages <= vec_len (pm->pages))
+ {
+ pm->error = clib_error_return (0, "maximum number of pages reached");
+ return 0;
+ }
+
+ pm->error = clib_sysfs_prealloc_hugepages (numa_node, pm->log2_page_sz,
+ n_pages);
+
+ 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 */
+ if (rv == -1 && numa_node != 0)
+ {
+ pm->error = clib_error_return_unix (0, "failed to get mempolicy");
+ return 0;
+ }
+
+ mask[0] = 1 << numa_node;
+ rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
+ if (rv == -1 && numa_node != 0)
+ {
+ pm->error = clib_error_return_unix (0, "failed to set mempolicy for "
+ "numa node %u", numa_node);
+ return 0;
+ }
+
+ mmap_flags = MAP_FIXED | MAP_HUGETLB | MAP_LOCKED | MAP_ANONYMOUS;
+ 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 (a->fd == -1)
+ goto error;
+ }
+ else
+ {
+ mmap_flags |= MAP_PRIVATE;
+ 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)
+ {
+ pm->error = clib_error_return_unix (0, "failed to mmap %u pages at %p "
+ "fd %d numa %d flags 0x%x", n_pages,
+ va, a->fd, numa_node, mmap_flags);
+ goto error;
+ }
+
+ rv = set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1);
+ if (rv == -1 && numa_node != 0)
+ {
+ pm->error = clib_error_return_unix (0, "failed to restore mempolicy");
+ goto error;
+ }
+
+ /* we tolerate move_pages failure only if request os for numa node 0
+ to support non-numa kernels */
+ rv = move_pages (0, 1, &va, 0, &status, 0);
+ if ((rv == 0 && status != numa_node) || (rv != 0 && numa_node != 0))
+ {
+ pm->error = rv == -1 ?
+ clib_error_return_unix (0, "page allocated on wrong node, numa node "
+ "%u status %d", numa_node, status) :
+ clib_error_return (0, "page allocated on wrong node, numa node "
+ "%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);
+ goto error;
+ }
+
+ 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->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);
+
+ /* return pointer to 1st page */
+ return pp - (n_pages - 1);
+
+error:
+ if (a->fd != -1)
+ close (a->fd);
+ return 0;
+}
+
+void *
+clib_pmalloc_create_shared_arena (clib_pmalloc_main_t * pm, char *name,
+ uword size, u32 numa_node)
+{
+ clib_pmalloc_arena_t *a;
+ clib_pmalloc_page_t *pp;
+ u32 n_pages = round_pow2 (size, 1 << pm->log2_page_sz) >> pm->log2_page_sz;
+
+ if (n_pages + vec_len (pm->pages) > pm->max_pages)
+ return 0;
+
+ if (pmalloc_validate_numa_node (&numa_node))
+ return 0;
+
+ pool_get (pm->arenas, a);
+ a->index = a - pm->arenas;
+ 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;
+
+ if ((pp = pmalloc_map_pages (pm, a, numa_node, n_pages)) == 0)
+ {
+ vec_free (a->name);
+ memset (a, 0, sizeof (*a));
+ pool_put (pm->arenas, a);
+ return 0;
+ }
+
+ return pm->base + (pp->index << pm->log2_page_sz);
+}
+
+static inline void *
+clib_pmalloc_alloc_inline (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
+ uword size, uword align, u32 numa_node)
+{
+ clib_pmalloc_page_t *pp;
+ u32 n_blocks, block_align, *page_index;
+
+ ASSERT (is_pow2 (align));
+
+ if (pmalloc_validate_numa_node (&numa_node))
+ return 0;
+
+ if (a == 0)
+ {
+ vec_validate_init_empty (pm->default_arena_for_numa_node,
+ numa_node, ~0);
+ if (pm->default_arena_for_numa_node[numa_node] == ~0)
+ {
+ pool_get (pm->arenas, a);
+ 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;
+ }
+ else
+ a = pool_elt_at_index (pm->arenas,
+ pm->default_arena_for_numa_node[numa_node]);
+ }
+
+ n_blocks = round_pow2 (size, PMALLOC_BLOCK_SZ) / PMALLOC_BLOCK_SZ;
+ block_align = align >> PMALLOC_LOG2_BLOCK_SZ;
+
+ vec_foreach (page_index, a->page_indices)
+ {
+ pp = vec_elt_at_index (pm->pages, *page_index);
+ void *rv = alloc_chunk_from_page (pm, pp, n_blocks, block_align,
+ numa_node);
+
+ if (rv)
+ return rv;
+ }
+
+ if ((a->flags & CLIB_PMALLOC_ARENA_F_SHARED_MEM) == 0 &&
+ (pp = pmalloc_map_pages (pm, a, numa_node, 1)))
+ return alloc_chunk_from_page (pm, pp, n_blocks, block_align, numa_node);
+
+ return 0;
+}
+
+void *
+clib_pmalloc_alloc_aligned_on_numa (clib_pmalloc_main_t * pm, uword size,
+ uword align, u32 numa_node)
+{
+ return clib_pmalloc_alloc_inline (pm, 0, size, align, numa_node);
+}
+
+void *
+clib_pmalloc_alloc_aligned (clib_pmalloc_main_t * pm, uword size, uword align)
+{
+ return clib_pmalloc_alloc_inline (pm, 0, size, align,
+ CLIB_PMALLOC_NUMA_LOCAL);
+}
+
+void *
+clib_pmalloc_alloc_from_arena (clib_pmalloc_main_t * pm, void *arena_va,
+ uword size, uword align)
+{
+ clib_pmalloc_arena_t *a = clib_pmalloc_get_arena (pm, arena_va);
+ return clib_pmalloc_alloc_inline (pm, a, size, align, 0);
+}
+
+void
+clib_pmalloc_free (clib_pmalloc_main_t * pm, void *va)
+{
+ clib_pmalloc_page_t *pp;
+ clib_pmalloc_chunk_t *c;
+ uword *p;
+ u32 chunk_index, page_index;
+
+ p = hash_get (pm->chunk_index_by_va, pointer_to_uword (va));
+
+ if (p == 0)
+ os_panic ();
+
+ chunk_index = p[0];
+ page_index = clib_pmalloc_get_page_index (pm, va);
+ hash_unset (pm->chunk_index_by_va, pointer_to_uword (va));
+
+ pp = vec_elt_at_index (pm->pages, page_index);
+ c = pool_elt_at_index (pp->chunks, chunk_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)
+ {
+ clib_pmalloc_chunk_t *next = get_chunk (pp, c->next);
+ c->size += next->size;
+ c->next = next->next;
+ if (next->next != ~0)
+ get_chunk (pp, next->next)->prev = chunk_index;
+ memset (next, 0, sizeof (*next));
+ pool_put (pp->chunks, next);
+ pp->n_free_chunks--;
+ }
+
+ /* merge with prev if free */
+ if (c->prev != ~0 && get_chunk (pp, c->prev)->used == 0)
+ {
+ clib_pmalloc_chunk_t *prev = get_chunk (pp, c->prev);
+ prev->size += c->size;
+ prev->next = c->next;
+ if (c->next != ~0)
+ get_chunk (pp, c->next)->prev = c->prev;
+ memset (c, 0, sizeof (*c));
+ pool_put (pp->chunks, c);
+ pp->n_free_chunks--;
+ }
+}
+
+static u8 *
+format_pmalloc_page (u8 * s, va_list * va)
+{
+ clib_pmalloc_page_t *pp = va_arg (*va, clib_pmalloc_page_t *);
+ int verbose = va_arg (*va, int);
+ u32 indent = format_get_indent (s);
+
+ s = format (s, "page %u: phys-addr %p ", pp->index, pp->pa);
+
+ if (pp->chunks == 0)
+ return s;
+
+ s = format (s, "free %u chunks %u free-chunks %d ",
+ (pp->n_free_blocks) << PMALLOC_LOG2_BLOCK_SZ,
+ pool_elts (pp->chunks), pp->n_free_chunks);
+
+ if (verbose >= 2)
+ {
+ clib_pmalloc_chunk_t *c;
+ c = pool_elt_at_index (pp->chunks, pp->first_chunk_index);
+ s = format (s, "\n%U%12s%12s%8s%8s%8s%8s",
+ format_white_space, indent + 2,
+ "chunk offset", "size", "used", "index", "prev", "next");
+ while (1)
+ {
+ s = format (s, "\n%U%12u%12u%8s%8d%8d%8d",
+ format_white_space, indent + 2,
+ c->start << PMALLOC_LOG2_BLOCK_SZ,
+ c->size << PMALLOC_LOG2_BLOCK_SZ,
+ c->used ? "yes" : "no",
+ c - pp->chunks, c->prev, c->next);
+ if (c->next == ~0)
+ break;
+ c = pool_elt_at_index (pp->chunks, c->next);
+ }
+ }
+ return s;
+}
+
+u8 *
+format_pmalloc (u8 * s, va_list * va)
+{
+ clib_pmalloc_main_t *pm = va_arg (*va, clib_pmalloc_main_t *);
+ int verbose = va_arg (*va, int);
+ u32 indent = format_get_indent (s);
+
+ 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));
+
+ if (verbose >= 2)
+ s = format (s, " va-start %p", pm->base);
+
+ if (pm->error)
+ s = format (s, "\n%Ulast-error: %U", format_white_space, indent + 2,
+ format_clib_error, pm->error);
+
+
+ /* *INDENT-OFF* */
+ 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);
+ if (a->fd != -1)
+ s = format (s, " shared fd %d", a->fd);
+ if (verbose >= 1)
+ vec_foreach (page_index, a->page_indices)
+ {
+ pp = vec_elt_at_index (pm->pages, *page_index);
+ s = format (s, "\n%U%U", format_white_space, indent + 4,
+ format_pmalloc_page, pp, verbose);
+ }
+ });
+ /* *INDENT-ON* */
+
+ return s;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */