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authorAnatoly Burakov <anatoly.burakov@intel.com>2018-10-05 09:29:44 +0100
committerThomas Monjalon <thomas@monjalon.net>2018-10-22 12:40:14 +0200
commit1dd342d0fdc4f72102f0b48c89b6a39f029004fe (patch)
tree32445ec7e219e96524cf0b0204b60276bd9ccebb
parent0042eb56461c77605f18b9c772bc3480df2b486b (diff)
downloaddpdk-1dd342d0fdc4.zip
dpdk-1dd342d0fdc4.tar.gz
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mem: improve segment list preallocation
Current code to preallocate segment lists is trying to do everything in one go, and thus ends up being convoluted, hard to understand, and, most importantly, does not scale beyond initial assumptions about number of NUMA nodes and number of page sizes, and therefore has issues on some configurations. Instead of fixing these issues in the existing code, simply rewrite it to be slightly less clever but much more logical, and provide ample comments to explain exactly what is going on. We cannot use the same approach for 32-bit code because the limitations of the target dictate current socket-centric approach rather than type-centric approach we use on 64-bit target, so 32-bit code is left unmodified. FreeBSD doesn't support NUMA so there's no complexity involved there, and thus its code is much more readable and not worth changing. Fixes: 1d406458db47 ("mem: make segment preallocation OS-specific") Cc: stable@dpdk.org Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
-rw-r--r--lib/librte_eal/linuxapp/eal/eal_memory.c181
1 files changed, 138 insertions, 43 deletions
diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 04f2648..19e686e 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -2131,18 +2131,65 @@ static int __rte_unused
memseg_primary_init(void)
{
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
- int i, socket_id, hpi_idx, msl_idx = 0;
+ struct memtype {
+ uint64_t page_sz;
+ int socket_id;
+ } *memtypes = NULL;
+ int i, hpi_idx, msl_idx;
struct rte_memseg_list *msl;
- uint64_t max_mem, total_mem;
+ uint64_t max_mem, max_mem_per_type;
+ unsigned int max_seglists_per_type;
+ unsigned int n_memtypes, cur_type;
/* no-huge does not need this at all */
if (internal_config.no_hugetlbfs)
return 0;
- max_mem = (uint64_t)RTE_MAX_MEM_MB << 20;
- total_mem = 0;
+ /*
+ * figuring out amount of memory we're going to have is a long and very
+ * involved process. the basic element we're operating with is a memory
+ * type, defined as a combination of NUMA node ID and page size (so that
+ * e.g. 2 sockets with 2 page sizes yield 4 memory types in total).
+ *
+ * deciding amount of memory going towards each memory type is a
+ * balancing act between maximum segments per type, maximum memory per
+ * type, and number of detected NUMA nodes. the goal is to make sure
+ * each memory type gets at least one memseg list.
+ *
+ * the total amount of memory is limited by RTE_MAX_MEM_MB value.
+ *
+ * the total amount of memory per type is limited by either
+ * RTE_MAX_MEM_MB_PER_TYPE, or by RTE_MAX_MEM_MB divided by the number
+ * of detected NUMA nodes. additionally, maximum number of segments per
+ * type is also limited by RTE_MAX_MEMSEG_PER_TYPE. this is because for
+ * smaller page sizes, it can take hundreds of thousands of segments to
+ * reach the above specified per-type memory limits.
+ *
+ * additionally, each type may have multiple memseg lists associated
+ * with it, each limited by either RTE_MAX_MEM_MB_PER_LIST for bigger
+ * page sizes, or RTE_MAX_MEMSEG_PER_LIST segments for smaller ones.
+ *
+ * the number of memseg lists per type is decided based on the above
+ * limits, and also taking number of detected NUMA nodes, to make sure
+ * that we don't run out of memseg lists before we populate all NUMA
+ * nodes with memory.
+ *
+ * we do this in three stages. first, we collect the number of types.
+ * then, we figure out memory constraints and populate the list of
+ * would-be memseg lists. then, we go ahead and allocate the memseg
+ * lists.
+ */
- /* create memseg lists */
+ /* create space for mem types */
+ n_memtypes = internal_config.num_hugepage_sizes * rte_socket_count();
+ memtypes = calloc(n_memtypes, sizeof(*memtypes));
+ if (memtypes == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot allocate space for memory types\n");
+ return -1;
+ }
+
+ /* populate mem types */
+ cur_type = 0;
for (hpi_idx = 0; hpi_idx < (int) internal_config.num_hugepage_sizes;
hpi_idx++) {
struct hugepage_info *hpi;
@@ -2151,59 +2198,107 @@ memseg_primary_init(void)
hpi = &internal_config.hugepage_info[hpi_idx];
hugepage_sz = hpi->hugepage_sz;
- for (i = 0; i < (int) rte_socket_count(); i++) {
- uint64_t max_type_mem, total_type_mem = 0;
- int type_msl_idx, max_segs, total_segs = 0;
-
- socket_id = rte_socket_id_by_idx(i);
+ for (i = 0; i < (int) rte_socket_count(); i++, cur_type++) {
+ int socket_id = rte_socket_id_by_idx(i);
#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
if (socket_id > 0)
break;
#endif
+ memtypes[cur_type].page_sz = hugepage_sz;
+ memtypes[cur_type].socket_id = socket_id;
- if (total_mem >= max_mem)
- break;
-
- max_type_mem = RTE_MIN(max_mem - total_mem,
- (uint64_t)RTE_MAX_MEM_MB_PER_TYPE << 20);
- max_segs = RTE_MAX_MEMSEG_PER_TYPE;
+ RTE_LOG(DEBUG, EAL, "Detected memory type: "
+ "socket_id:%u hugepage_sz:%" PRIu64 "\n",
+ socket_id, hugepage_sz);
+ }
+ }
- type_msl_idx = 0;
- while (total_type_mem < max_type_mem &&
- total_segs < max_segs) {
- uint64_t cur_max_mem, cur_mem;
- unsigned int n_segs;
+ /* set up limits for types */
+ max_mem = (uint64_t)RTE_MAX_MEM_MB << 20;
+ max_mem_per_type = RTE_MIN((uint64_t)RTE_MAX_MEM_MB_PER_TYPE << 20,
+ max_mem / n_memtypes);
+ /*
+ * limit maximum number of segment lists per type to ensure there's
+ * space for memseg lists for all NUMA nodes with all page sizes
+ */
+ max_seglists_per_type = RTE_MAX_MEMSEG_LISTS / n_memtypes;
- if (msl_idx >= RTE_MAX_MEMSEG_LISTS) {
- RTE_LOG(ERR, EAL,
- "No more space in memseg lists, please increase %s\n",
- RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
- return -1;
- }
+ if (max_seglists_per_type == 0) {
+ RTE_LOG(ERR, EAL, "Cannot accommodate all memory types, please increase %s\n",
+ RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
+ return -1;
+ }
- msl = &mcfg->memsegs[msl_idx++];
+ /* go through all mem types and create segment lists */
+ msl_idx = 0;
+ for (cur_type = 0; cur_type < n_memtypes; cur_type++) {
+ unsigned int cur_seglist, n_seglists, n_segs;
+ unsigned int max_segs_per_type, max_segs_per_list;
+ struct memtype *type = &memtypes[cur_type];
+ uint64_t max_mem_per_list, pagesz;
+ int socket_id;
- cur_max_mem = max_type_mem - total_type_mem;
+ pagesz = type->page_sz;
+ socket_id = type->socket_id;
- cur_mem = get_mem_amount(hugepage_sz,
- cur_max_mem);
- n_segs = cur_mem / hugepage_sz;
+ /*
+ * we need to create segment lists for this type. we must take
+ * into account the following things:
+ *
+ * 1. total amount of memory we can use for this memory type
+ * 2. total amount of memory per memseg list allowed
+ * 3. number of segments needed to fit the amount of memory
+ * 4. number of segments allowed per type
+ * 5. number of segments allowed per memseg list
+ * 6. number of memseg lists we are allowed to take up
+ */
- if (alloc_memseg_list(msl, hugepage_sz, n_segs,
- socket_id, type_msl_idx))
- return -1;
+ /* calculate how much segments we will need in total */
+ max_segs_per_type = max_mem_per_type / pagesz;
+ /* limit number of segments to maximum allowed per type */
+ max_segs_per_type = RTE_MIN(max_segs_per_type,
+ (unsigned int)RTE_MAX_MEMSEG_PER_TYPE);
+ /* limit number of segments to maximum allowed per list */
+ max_segs_per_list = RTE_MIN(max_segs_per_type,
+ (unsigned int)RTE_MAX_MEMSEG_PER_LIST);
+
+ /* calculate how much memory we can have per segment list */
+ max_mem_per_list = RTE_MIN(max_segs_per_list * pagesz,
+ (uint64_t)RTE_MAX_MEM_MB_PER_LIST << 20);
+
+ /* calculate how many segments each segment list will have */
+ n_segs = RTE_MIN(max_segs_per_list, max_mem_per_list / pagesz);
+
+ /* calculate how many segment lists we can have */
+ n_seglists = RTE_MIN(max_segs_per_type / n_segs,
+ max_mem_per_type / max_mem_per_list);
+
+ /* limit number of segment lists according to our maximum */
+ n_seglists = RTE_MIN(n_seglists, max_seglists_per_type);
+
+ RTE_LOG(DEBUG, EAL, "Creating %i segment lists: "
+ "n_segs:%i socket_id:%i hugepage_sz:%" PRIu64 "\n",
+ n_seglists, n_segs, socket_id, pagesz);
+
+ /* create all segment lists */
+ for (cur_seglist = 0; cur_seglist < n_seglists; cur_seglist++) {
+ if (msl_idx >= RTE_MAX_MEMSEG_LISTS) {
+ RTE_LOG(ERR, EAL,
+ "No more space in memseg lists, please increase %s\n",
+ RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
+ return -1;
+ }
+ msl = &mcfg->memsegs[msl_idx++];
- total_segs += msl->memseg_arr.len;
- total_type_mem = total_segs * hugepage_sz;
- type_msl_idx++;
+ if (alloc_memseg_list(msl, pagesz, n_segs,
+ socket_id, cur_seglist))
+ return -1;
- if (alloc_va_space(msl)) {
- RTE_LOG(ERR, EAL, "Cannot allocate VA space for memseg list\n");
- return -1;
- }
+ if (alloc_va_space(msl)) {
+ RTE_LOG(ERR, EAL, "Cannot allocate VA space for memseg list\n");
+ return -1;
}
- total_mem += total_type_mem;
}
}
return 0;