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From: Muchun Song In-Reply-To: <20240118123911.88833-8-gang.li@linux.dev> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: B1F4BC000F X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: sfthu67t19g5qa149bjukp7t3i76hywe X-HE-Tag: 1706088245-974024 X-HE-Meta: U2FsdGVkX1+XuR+KITHGtZD+pqQT8ahk8HSfnX+e2Tq/Rcwn4eI1LM0v5hQXwUVGhNFaFkRVu6rwWkPUN/+kGVIBBbK+bkNccazHjPp8P9jUyfUNyuiL+8u/gZcUAqxYLhdOyU+igjRggObZS5BGaMFupJ7WmAdkT1jy/CqRKhD1vqgGjhR21BkwnYBLkmuZ893OiLFRhnWC209p4KA3RCu75Kd5BrI7R1U23vkM1RNnMieoJa21S85yH2Hf+Rgqtv4vlqB5kQcsyFJWbUAyFHvHNltpEjjhI8PmYj/TVu0EcK3Bx7ls12H8oJYI8uyJqDeVR1vVNhzq14vrJXJ9pA3EPouo6XrVH4jggVECJXmNXyrNJpy2hgnvj1S7i6WPc1Ga0CIZOO4anKFwqUG8VytmaipUc8IULexH45HOPjhS7T7GBuSMTZj9tu6UbPeqRGZn1rMK9caIGFk1W0jfW7oFGEdpViNUF7RhtCh1d6UsW2ufVB0OKj1M80j1+NKkdQZJDODT6JaQqv/ows03MV/rNA3q8aqWP89tKYvioRL7n+JxSCly+MY6kW/wT1pdCR78Sw0qQhBu0M3JEpvDnopMRWapTmIEOJChLjC0QPfRWgBzL4qTI7qpEjEJQm+fOFDt3abYI2NZmgpiHaRVJBpKzHGoPQA3Wc49ceetgI55Urb9z8xeg/jTXicPAgQeW0P1fTyC7HzEnpCqHzgZUpV1i/yHH1RgWFOmyG/sOCZecphQfPoeCuWE2fqOxUQV4OT3bd4iDc6aLiqeZM5qFOTzOwb+OXrSf9qvk4F8O09Y42KOQw0b7SF/2AQvPXQqCQpSJxPMdnI6mwVs1dzfsGD0fWAv5fWrrYOzD4fWSIGwgE95FVjWF9Il+ac19pVsm5uc9GZWpIWQCHaXmAjqjiwprAu3Mhn43rLSaVAm7699DmdtjUXKfkP7RuGJZXMvjB8Me+EQeNFA47N7PFV T/qjzFG2 dq0/Px8FM3aiuG8cq+7dBLVOnqtpcX361lXhDDTzuaQRXktk0nFDxSiwLnqOV9+T3o85LRsSfVtxThMn6fFVUbiURnDvT9V6k9kBpgMLSjErEoZZxy1ZIu+dV5Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2024/1/18 20:39, Gang Li wrote: > Optimizing the initialization speed of 1G huge pages through > parallelization. > > 1G hugetlbs are allocated from bootmem, a process that is already > very fast and does not currently require optimization. Therefore, > we focus on parallelizing only the initialization phase in > `gather_bootmem_prealloc`. > > Here are some test results: > test no patch(ms) patched(ms) saved > ------------------- -------------- ------------- -------- > 256c2t(4 node) 1G 4745 2024 57.34% What does "256c2t" mean? > 128c1t(2 node) 1G 3358 1712 49.02% > 12t 1G 77000 18300 76.23% > > Signed-off-by: Gang Li > Tested-by: David Rientjes > --- > include/linux/hugetlb.h | 2 +- > mm/hugetlb.c | 42 +++++++++++++++++++++++++++++++++-------- > 2 files changed, 35 insertions(+), 9 deletions(-) > > diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h > index c1ee640d87b1..77b30a8c6076 100644 > --- a/include/linux/hugetlb.h > +++ b/include/linux/hugetlb.h > @@ -178,7 +178,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma, > struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage); > > extern int sysctl_hugetlb_shm_group; > -extern struct list_head huge_boot_pages; > +extern struct list_head huge_boot_pages[MAX_NUMNODES]; > > /* arch callbacks */ > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 9b348ba418f5..2f4b77630ada 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -69,7 +69,7 @@ static bool hugetlb_cma_folio(struct folio *folio, unsigned int order) > #endif > static unsigned long hugetlb_cma_size __initdata; > > -__initdata LIST_HEAD(huge_boot_pages); > +__initdata struct list_head huge_boot_pages[MAX_NUMNODES]; > > /* for command line parsing */ > static struct hstate * __initdata parsed_hstate; > @@ -3301,7 +3301,7 @@ int alloc_bootmem_huge_page(struct hstate *h, int nid) > int __alloc_bootmem_huge_page(struct hstate *h, int nid) > { > struct huge_bootmem_page *m = NULL; /* initialize for clang */ > - int nr_nodes, node; > + int nr_nodes, node = nid; Why not use nid directly in the following list_add()? > > /* do node specific alloc */ > if (nid != NUMA_NO_NODE) { > @@ -3339,7 +3339,7 @@ int __alloc_bootmem_huge_page(struct hstate *h, int nid) > huge_page_size(h) - PAGE_SIZE); > /* Put them into a private list first because mem_map is not up yet */ > INIT_LIST_HEAD(&m->list); > - list_add(&m->list, &huge_boot_pages); > + list_add(&m->list, &huge_boot_pages[node]); > m->hstate = h; > return 1; > } > @@ -3390,8 +3390,6 @@ static void __init prep_and_add_bootmem_folios(struct hstate *h, > /* Send list for bulk vmemmap optimization processing */ > hugetlb_vmemmap_optimize_folios(h, folio_list); > > - /* Add all new pool pages to free lists in one lock cycle */ > - spin_lock_irqsave(&hugetlb_lock, flags); > list_for_each_entry_safe(folio, tmp_f, folio_list, lru) { > if (!folio_test_hugetlb_vmemmap_optimized(folio)) { > /* > @@ -3404,23 +3402,27 @@ static void __init prep_and_add_bootmem_folios(struct hstate *h, > HUGETLB_VMEMMAP_RESERVE_PAGES, > pages_per_huge_page(h)); > } > + /* Subdivide locks to achieve better parallel performance * > + spin_lock_irqsave(&hugetlb_lock, flags); > __prep_account_new_huge_page(h, folio_nid(folio)); > enqueue_hugetlb_folio(h, folio); > + spin_unlock_irqrestore(&hugetlb_lock, flags); > } > - spin_unlock_irqrestore(&hugetlb_lock, flags); > } > > /* > * Put bootmem huge pages into the standard lists after mem_map is up. > * Note: This only applies to gigantic (order > MAX_PAGE_ORDER) pages. > */ > -static void __init gather_bootmem_prealloc(void) > +static void __init __gather_bootmem_prealloc(unsigned long start, unsigned long end, void *arg) This function name could be gather_bootmem_prealloc_node. > + > { > + int nid = start; > LIST_HEAD(folio_list); > struct huge_bootmem_page *m; > struct hstate *h = NULL, *prev_h = NULL; > > - list_for_each_entry(m, &huge_boot_pages, list) { > + list_for_each_entry(m, &huge_boot_pages[nid], list) { > struct page *page = virt_to_page(m); > struct folio *folio = (void *)page; > > @@ -3453,6 +3455,22 @@ static void __init gather_bootmem_prealloc(void) > prep_and_add_bootmem_folios(h, &folio_list); > } > > +static void __init gather_bootmem_prealloc(void) > +{ > + struct padata_mt_job job = { > + .thread_fn = __gather_bootmem_prealloc, > + .fn_arg = NULL, > + .start = 0, > + .size = num_node_state(N_MEMORY), > + .align = 1, > + .min_chunk = 1, > + .max_threads = num_node_state(N_MEMORY), > + .numa_aware = true, > + }; > + > + padata_do_multithreaded(&job); > +} > + > static void __init hugetlb_hstate_alloc_pages_onenode(struct hstate *h, int nid) > { > unsigned long i; > @@ -3602,6 +3620,14 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h) > return; > } > > + /* hugetlb_hstate_alloc_pages will be called many times, init huge_boot_pages once*/ s/init/initialize/g And you miss a black right before "*/". > + if (huge_boot_pages[0].next == NULL) { It it not intuitive. I'd like to use a 'initialied' variable to indicate whether it has been initialized. BTW, it can be marked as __initdata. > + int i = 0; > + > + for (i = 0; i < MAX_NUMNODES; i++) > + INIT_LIST_HEAD(&huge_boot_pages[i]); > + } > + > /* do node specific alloc */ > if (hugetlb_hstate_alloc_pages_specific_nodes(h)) > return;