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author | Pavel Tatashin <pasha.tatashin@oracle.com> | 2017-02-16 15:05:58 -0500 |
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committer | David S. Miller <davem@davemloft.net> | 2017-02-23 08:33:23 -0800 |
commit | 1537b26dab1c1dfd92a116a933143f52b1112a22 (patch) | |
tree | 6555914c573ecb50d8f13efb72f51cc02d0e3a5a /arch/sparc/mm | |
parent | dcd1912d21a02534d1f0a9005d5ba3283f164780 (diff) | |
download | linux-1537b26dab1c1dfd92a116a933143f52b1112a22.tar.gz linux-1537b26dab1c1dfd92a116a933143f52b1112a22.tar.bz2 linux-1537b26dab1c1dfd92a116a933143f52b1112a22.zip |
sparc64: use latency groups to improve add_node_ranges speed
add_node_ranges() takes 2.6s - 3.6s per 1T of boot time. On machine with 6T
memory it takes 15.4s, on 32T it would take 82s-115s of boot time.
This function sets NUMA ids for memory blocks, and scans the whole memory a
page at a time to do so. But, we could use values in latency groups mask
and match to determine the boundaries without checking every single page.
With the fix the add_node_ranges() time is reduced from 15.4s down to 0.2s
on machine with 6T memory.
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Babu Moger <babu.moger@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r-- | arch/sparc/mm/init_64.c | 208 |
1 files changed, 113 insertions, 95 deletions
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 16c1e46e8603..77446eaf1395 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -829,13 +829,23 @@ static void __init find_ramdisk(unsigned long phys_base) struct node_mem_mask { unsigned long mask; - unsigned long val; + unsigned long match; }; static struct node_mem_mask node_masks[MAX_NUMNODES]; static int num_node_masks; #ifdef CONFIG_NEED_MULTIPLE_NODES +struct mdesc_mlgroup { + u64 node; + u64 latency; + u64 match; + u64 mask; +}; + +static struct mdesc_mlgroup *mlgroups; +static int num_mlgroups; + int numa_cpu_lookup_table[NR_CPUS]; cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES]; @@ -846,78 +856,129 @@ struct mdesc_mblock { }; static struct mdesc_mblock *mblocks; static int num_mblocks; -static int find_numa_node_for_addr(unsigned long pa, - struct node_mem_mask *pnode_mask); -static unsigned long __init ra_to_pa(unsigned long addr) +static struct mdesc_mblock * __init addr_to_mblock(unsigned long addr) { + struct mdesc_mblock *m = NULL; int i; for (i = 0; i < num_mblocks; i++) { - struct mdesc_mblock *m = &mblocks[i]; + m = &mblocks[i]; if (addr >= m->base && addr < (m->base + m->size)) { - addr += m->offset; break; } } - return addr; + + return m; } -static int __init find_node(unsigned long addr) +static u64 __init memblock_nid_range_sun4u(u64 start, u64 end, int *nid) { - static bool search_mdesc = true; - static struct node_mem_mask last_mem_mask = { ~0UL, ~0UL }; - static int last_index; - int i; + int prev_nid, new_nid; - addr = ra_to_pa(addr); - for (i = 0; i < num_node_masks; i++) { - struct node_mem_mask *p = &node_masks[i]; + prev_nid = -1; + for ( ; start < end; start += PAGE_SIZE) { + for (new_nid = 0; new_nid < num_node_masks; new_nid++) { + struct node_mem_mask *p = &node_masks[new_nid]; - if ((addr & p->mask) == p->val) - return i; - } - /* The following condition has been observed on LDOM guests because - * node_masks only contains the best latency mask and value. - * LDOM guest's mdesc can contain a single latency group to - * cover multiple address range. Print warning message only if the - * address cannot be found in node_masks nor mdesc. - */ - if ((search_mdesc) && - ((addr & last_mem_mask.mask) != last_mem_mask.val)) { - /* find the available node in the mdesc */ - last_index = find_numa_node_for_addr(addr, &last_mem_mask); - numadbg("find_node: latency group for address 0x%lx is %d\n", - addr, last_index); - if ((last_index < 0) || (last_index >= num_node_masks)) { - /* WARN_ONCE() and use default group 0 */ - WARN_ONCE(1, "find_node: A physical address doesn't match a NUMA node rule. Some physical memory will be owned by node 0."); - search_mdesc = false; - last_index = 0; + if ((start & p->mask) == p->match) { + if (prev_nid == -1) + prev_nid = new_nid; + break; + } } + + if (new_nid == num_node_masks) { + prev_nid = 0; + WARN_ONCE(1, "addr[%Lx] doesn't match a NUMA node rule. Some memory will be owned by node 0.", + start); + break; + } + + if (prev_nid != new_nid) + break; } + *nid = prev_nid; - return last_index; + return start > end ? end : start; } static u64 __init memblock_nid_range(u64 start, u64 end, int *nid) { - *nid = find_node(start); - start += PAGE_SIZE; - while (start < end) { - int n = find_node(start); + u64 ret_end, pa_start, m_mask, m_match, m_end; + struct mdesc_mblock *mblock; + int _nid, i; + + if (tlb_type != hypervisor) + return memblock_nid_range_sun4u(start, end, nid); + + mblock = addr_to_mblock(start); + if (!mblock) { + WARN_ONCE(1, "memblock_nid_range: Can't find mblock addr[%Lx]", + start); + + _nid = 0; + ret_end = end; + goto done; + } + + pa_start = start + mblock->offset; + m_match = 0; + m_mask = 0; + + for (_nid = 0; _nid < num_node_masks; _nid++) { + struct node_mem_mask *const m = &node_masks[_nid]; - if (n != *nid) + if ((pa_start & m->mask) == m->match) { + m_match = m->match; + m_mask = m->mask; break; - start += PAGE_SIZE; + } } - if (start > end) - start = end; + if (num_node_masks == _nid) { + /* We could not find NUMA group, so default to 0, but lets + * search for latency group, so we could calculate the correct + * end address that we return + */ + _nid = 0; - return start; + for (i = 0; i < num_mlgroups; i++) { + struct mdesc_mlgroup *const m = &mlgroups[i]; + + if ((pa_start & m->mask) == m->match) { + m_match = m->match; + m_mask = m->mask; + break; + } + } + + if (i == num_mlgroups) { + WARN_ONCE(1, "memblock_nid_range: Can't find latency group addr[%Lx]", + start); + + ret_end = end; + goto done; + } + } + + /* + * Each latency group has match and mask, and each memory block has an + * offset. An address belongs to a latency group if its address matches + * the following formula: ((addr + offset) & mask) == match + * It is, however, slow to check every single page if it matches a + * particular latency group. As optimization we calculate end value by + * using bit arithmetics. + */ + m_end = m_match + (1ul << __ffs(m_mask)) - mblock->offset; + m_end += pa_start & ~((1ul << fls64(m_mask)) - 1); + ret_end = m_end > end ? end : m_end; + +done: + *nid = _nid; + return ret_end; } #endif @@ -958,7 +1019,8 @@ static void init_node_masks_nonnuma(void) numadbg("Initializing tables for non-numa.\n"); - node_masks[0].mask = node_masks[0].val = 0; + node_masks[0].mask = 0; + node_masks[0].match = 0; num_node_masks = 1; #ifdef CONFIG_NEED_MULTIPLE_NODES @@ -976,15 +1038,6 @@ EXPORT_SYMBOL(numa_cpu_lookup_table); EXPORT_SYMBOL(numa_cpumask_lookup_table); EXPORT_SYMBOL(node_data); -struct mdesc_mlgroup { - u64 node; - u64 latency; - u64 match; - u64 mask; -}; -static struct mdesc_mlgroup *mlgroups; -static int num_mlgroups; - static int scan_pio_for_cfg_handle(struct mdesc_handle *md, u64 pio, u32 cfg_handle) { @@ -1226,41 +1279,6 @@ int __node_distance(int from, int to) return numa_latency[from][to]; } -static int find_numa_node_for_addr(unsigned long pa, - struct node_mem_mask *pnode_mask) -{ - struct mdesc_handle *md = mdesc_grab(); - u64 node, arc; - int i = 0; - - node = mdesc_node_by_name(md, MDESC_NODE_NULL, "latency-groups"); - if (node == MDESC_NODE_NULL) - goto out; - - mdesc_for_each_node_by_name(md, node, "group") { - mdesc_for_each_arc(arc, md, node, MDESC_ARC_TYPE_FWD) { - u64 target = mdesc_arc_target(md, arc); - struct mdesc_mlgroup *m = find_mlgroup(target); - - if (!m) - continue; - if ((pa & m->mask) == m->match) { - if (pnode_mask) { - pnode_mask->mask = m->mask; - pnode_mask->val = m->match; - } - mdesc_release(md); - return i; - } - } - i++; - } - -out: - mdesc_release(md); - return -1; -} - static int __init find_best_numa_node_for_mlgroup(struct mdesc_mlgroup *grp) { int i; @@ -1268,7 +1286,7 @@ static int __init find_best_numa_node_for_mlgroup(struct mdesc_mlgroup *grp) for (i = 0; i < MAX_NUMNODES; i++) { struct node_mem_mask *n = &node_masks[i]; - if ((grp->mask == n->mask) && (grp->match == n->val)) + if ((grp->mask == n->mask) && (grp->match == n->match)) break; } return i; @@ -1323,10 +1341,10 @@ static int __init numa_attach_mlgroup(struct mdesc_handle *md, u64 grp, n = &node_masks[num_node_masks++]; n->mask = candidate->mask; - n->val = candidate->match; + n->match = candidate->match; - numadbg("NUMA NODE[%d]: mask[%lx] val[%lx] (latency[%llx])\n", - index, n->mask, n->val, candidate->latency); + numadbg("NUMA NODE[%d]: mask[%lx] match[%lx] (latency[%llx])\n", + index, n->mask, n->match, candidate->latency); return 0; } @@ -1423,7 +1441,7 @@ static int __init numa_parse_jbus(void) numa_cpu_lookup_table[cpu] = index; cpumask_copy(&numa_cpumask_lookup_table[index], cpumask_of(cpu)); node_masks[index].mask = ~((1UL << 36UL) - 1UL); - node_masks[index].val = cpu << 36UL; + node_masks[index].match = cpu << 36UL; index++; } |