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hugetlb: allow to free gigantic pages regardless of the configuration 

On systems without CONTIG_ALLOC activated but that support gigantic pages,
boottime reserved gigantic pages can not be freed at all.  This patch
simply enables the possibility to hand back those pages to memory
allocator.

Link: http://lkml.kernel.org/r/20190327063626.18421-5-alex@ghiti.fr
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Acked-by: David S. Miller <davem@davemloft.net> [sparc]
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Andy Lutomirsky <luto@kernel.org>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.2
Alexandre Ghiti 2019-05-13 17:19:04 -07:00 committed by Linus Torvalds
parent 8df995f6bd
commit 4eb0716e86
14 changed files with 61 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/Kconfig
View File

@ -19,7 +19,7 @@ config ARM64
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC
select ARCH_HAS_GIGANTIC_PAGE
select ARCH_HAS_KCOV
select ARCH_HAS_KEEPINITRD
select ARCH_HAS_MEMBARRIER_SYNC_CORE

4
arch/arm64/include/asm/hugetlb.h
View File

@ -70,8 +70,4 @@ extern void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
#include <asm-generic/hugetlb.h>
#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void) { return true; }
#endif
#endif /* __ASM_HUGETLB_H */

5
arch/powerpc/include/asm/book3s/64/hugetlb.h
View File

@ -36,8 +36,8 @@ static inline int hstate_get_psize(struct hstate *hstate)
}
}
#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void)
#define __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED
static inline bool gigantic_page_runtime_supported(void)
{
/*
* We used gigantic page reservation with hypervisor assist in some case.
@ -49,7 +49,6 @@ static inline bool gigantic_page_supported(void)
return true;
}
#endif
/* hugepd entry valid bit */
#define HUGEPD_VAL_BITS (0x8000000000000000UL)

2
arch/powerpc/platforms/Kconfig.cputype
View File

@ -331,7 +331,7 @@ config ARCH_ENABLE_SPLIT_PMD_PTLOCK
config PPC_RADIX_MMU
bool "Radix MMU Support"
depends on PPC_BOOK3S_64 && HUGETLB_PAGE
select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC
select ARCH_HAS_GIGANTIC_PAGE
select PPC_HAVE_KUEP
select PPC_HAVE_KUAP
default y

2
arch/s390/Kconfig
View File

@ -63,7 +63,7 @@ config S390
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC
select ARCH_HAS_GIGANTIC_PAGE
select ARCH_HAS_KCOV
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_MEMORY

8
arch/s390/include/asm/hugetlb.h
View File

@ -116,7 +116,9 @@ static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
return pte_modify(pte, newprot);
}
#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void) { return true; }
#endif
static inline bool gigantic_page_runtime_supported(void)
{
return true;
}
#endif /* _ASM_S390_HUGETLB_H */

2
arch/sh/Kconfig
View File

@ -53,7 +53,7 @@ config SUPERH
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_NMI
select NEED_SG_DMA_LENGTH
select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC
select ARCH_HAS_GIGANTIC_PAGE
help
The SuperH is a RISC processor targeted for use in embedded systems

2
arch/sparc/Kconfig
View File

@ -92,7 +92,7 @@ config SPARC64
select ARCH_CLOCKSOURCE_DATA
select ARCH_HAS_PTE_SPECIAL
select PCI_DOMAINS if PCI
select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC
select ARCH_HAS_GIGANTIC_PAGE
config ARCH_DEFCONFIG
string

2
arch/x86/Kconfig
View File

@ -22,7 +22,7 @@ config X86_64
def_bool y
depends on 64BIT
# Options that are inherently 64-bit kernel only:
select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC
select ARCH_HAS_GIGANTIC_PAGE
select ARCH_SUPPORTS_INT128
select ARCH_USE_CMPXCHG_LOCKREF
select HAVE_ARCH_SOFT_DIRTY

4
arch/x86/include/asm/hugetlb.h
View File

@ -17,8 +17,4 @@ static inline void arch_clear_hugepage_flags(struct page *page)
{
}
#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void) { return true; }
#endif
#endif /* _ASM_X86_HUGETLB_H */

7
include/asm-generic/hugetlb.h
View File

@ -126,4 +126,11 @@ static inline pte_t huge_ptep_get(pte_t *ptep)
}
#endif
#ifndef __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED
static inline bool gigantic_page_runtime_supported(void)
{
return IS_ENABLED(CONFIG_ARCH_HAS_GIGANTIC_PAGE);
}
#endif /* __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED */
#endif /* _ASM_GENERIC_HUGETLB_H */

2
include/linux/gfp.h
View File

@ -589,8 +589,8 @@ static inline bool pm_suspended_storage(void)
/* The below functions must be run on a range from a single zone. */
extern int alloc_contig_range(unsigned long start, unsigned long end,
unsigned migratetype, gfp_t gfp_mask);
extern void free_contig_range(unsigned long pfn, unsigned nr_pages);
#endif
void free_contig_range(unsigned long pfn, unsigned int nr_pages);
#ifdef CONFIG_CMA
/* CMA stuff */

54
mm/hugetlb.c
View File

@ -1059,6 +1059,7 @@ static void free_gigantic_page(struct page *page, unsigned int order)
free_contig_range(page_to_pfn(page), 1 << order);
}
#ifdef CONFIG_CONTIG_ALLOC
static int __alloc_gigantic_page(unsigned long start_pfn,
unsigned long nr_pages, gfp_t gfp_mask)
{
@ -1143,11 +1144,20 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid);
static void prep_compound_gigantic_page(struct page *page, unsigned int order);
#else /* !CONFIG_CONTIG_ALLOC */
static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nodemask)
{
return NULL;
}
#endif /* CONFIG_CONTIG_ALLOC */
#else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE */
static inline bool gigantic_page_supported(void) { return false; }
static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nodemask) { return NULL; }
int nid, nodemask_t *nodemask)
{
return NULL;
}
static inline void free_gigantic_page(struct page *page, unsigned int order) { }
static inline void destroy_compound_gigantic_page(struct page *page,
unsigned int order) { }
@ -1157,7 +1167,7 @@ static void update_and_free_page(struct hstate *h, struct page *page)
{
int i;
if (hstate_is_gigantic(h) && !gigantic_page_supported())
if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
return;
h->nr_huge_pages--;
@ -2278,13 +2288,27 @@ found:
}
#define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)
static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
nodemask_t *nodes_allowed)
static int set_max_huge_pages(struct hstate *h, unsigned long count,
nodemask_t *nodes_allowed)
{
unsigned long min_count, ret;
if (hstate_is_gigantic(h) && !gigantic_page_supported())
return h->max_huge_pages;
spin_lock(&hugetlb_lock);
/*
* Gigantic pages runtime allocation depend on the capability for large
* page range allocation.
* If the system does not provide this feature, return an error when
* the user tries to allocate gigantic pages but let the user free the
* boottime allocated gigantic pages.
*/
if (hstate_is_gigantic(h) && !IS_ENABLED(CONFIG_CONTIG_ALLOC)) {
if (count > persistent_huge_pages(h)) {
spin_unlock(&hugetlb_lock);
return -EINVAL;
}
/* Fall through to decrease pool */
}
/*
* Increase the pool size
@ -2297,7 +2321,6 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
* pool might be one hugepage larger than it needs to be, but
* within all the constraints specified by the sysctls.
*/
spin_lock(&hugetlb_lock);
while (h->surplus_huge_pages && count > persistent_huge_pages(h)) {
if (!adjust_pool_surplus(h, nodes_allowed, -1))
break;
@ -2352,9 +2375,10 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
break;
}
out:
ret = persistent_huge_pages(h);
h->max_huge_pages = persistent_huge_pages(h);
spin_unlock(&hugetlb_lock);
return ret;
return 0;
}
#define HSTATE_ATTR_RO(_name) \
@ -2406,7 +2430,7 @@ static ssize_t __nr_hugepages_store_common(bool obey_mempolicy,
int err;
NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY);
if (hstate_is_gigantic(h) && !gigantic_page_supported()) {
if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported()) {
err = -EINVAL;
goto out;
}
@ -2430,15 +2454,13 @@ static ssize_t __nr_hugepages_store_common(bool obey_mempolicy,
} else
nodes_allowed = &node_states[N_MEMORY];
h->max_huge_pages = set_max_huge_pages(h, count, nodes_allowed);
err = set_max_huge_pages(h, count, nodes_allowed);
out:
if (nodes_allowed != &node_states[N_MEMORY])
NODEMASK_FREE(nodes_allowed);
return len;
out:
NODEMASK_FREE(nodes_allowed);
return err;
return err ? err : len;
}
static ssize_t nr_hugepages_store_common(bool obey_mempolicy,

4
mm/page_alloc.c
View File

@ -8346,8 +8346,9 @@ done:
pfn_max_align_up(end), migratetype);
return ret;
}
#endif /* CONFIG_CONTIG_ALLOC */
void free_contig_range(unsigned long pfn, unsigned nr_pages)
void free_contig_range(unsigned long pfn, unsigned int nr_pages)
{
unsigned int count = 0;
@ -8359,7 +8360,6 @@ void free_contig_range(unsigned long pfn, unsigned nr_pages)
}
WARN(count != 0, "%d pages are still in use!\n", count);
}
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
/*