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mm: make deferred init's max threads arch-specific

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Using padata during deferred init has only been tested on x86, so for now
limit it to this architecture.

If another arch wants this, it can find the max thread limit that's best
for it and override deferred_page_init_max_threads().

Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Josh Triplett <josh@joshtriplett.org>
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Robert Elliott <elliott@hpe.com>
Cc: Shile Zhang <shile.zhang@linux.alibaba.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Steven Sistare <steven.sistare@oracle.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Link: http://lkml.kernel.org/r/20200527173608.2885243-8-daniel.m.jordan@oracle.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Jordan 2020-06-03 15:59:55 -07:00 committed by Linus Torvalds
parent e44431498f
commit ecd0965069
3 changed files with 23 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/mm/init_64.c
View File

@ -1265,6 +1265,18 @@ void __init mem_init(void)
mem_init_print_info(NULL);
}
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask)
{
/*
* More CPUs always led to greater speedups on tested systems, up to
* all the nodes' CPUs. Use all since the system is otherwise idle
* now.
*/
return max_t(int, cpumask_weight(node_cpumask), 1);
}
#endif
int kernel_set_to_readonly;
void mark_rodata_ro(void)

3
include/linux/memblock.h
View File

@ -273,6 +273,9 @@ void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
#define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
for (; i != U64_MAX; \
__next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
/**

13
mm/page_alloc.c
View File

@ -1836,6 +1836,13 @@ deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn,
}
}
/* An arch may override for more concurrency. */
__weak int __init
deferred_page_init_max_threads(const struct cpumask *node_cpumask)
{
return 1;
}
/* Initialise remaining memory on a node */
static int __init deferred_init_memmap(void *data)
{
@ -1884,11 +1891,7 @@ static int __init deferred_init_memmap(void *data)
first_init_pfn))
goto zone_empty;
/*
* More CPUs always led to greater speedups on tested systems, up to
* all the nodes' CPUs. Use all since the system is otherwise idle now.
*/
max_threads = max(cpumask_weight(cpumask), 1u);
max_threads = deferred_page_init_max_threads(cpumask);
while (spfn < epfn) {
unsigned long epfn_align = ALIGN(epfn, PAGES_PER_SECTION);