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Date: Mon, 20 Apr 2015 07:26:28 +0200 (CEST) From: Christophe Leroy <christophe.leroy@....fr> To: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Michael Ellerman <mpe@...erman.id.au>, scottwood@...escale.com CC: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, Joakim Tjernlund <joakim.tjernlund@...nsmode.se> Subject: [PATCH 03/11] powerpc32: Use kmem_cache memory for PGDIR When pages are not 4K, PGDIR table is allocated with kmalloc(). In order to optimise TLB handlers, aligned memory is needed. kmalloc() doesn't provide aligned memory blocks, so lets use a kmem_cache pool instead. Signed-off-by: Christophe Leroy <christophe.leroy@....fr> --- arch/powerpc/include/asm/pgtable-ppc32.h | 4 ++++ arch/powerpc/mm/pgtable_32.c | 16 ++++++++++++++-- 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/pgtable-ppc32.h b/arch/powerpc/include/asm/pgtable-ppc32.h index 543bb8e..d323e8b 100644 --- a/arch/powerpc/include/asm/pgtable-ppc32.h +++ b/arch/powerpc/include/asm/pgtable-ppc32.h @@ -346,10 +346,14 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry) #define pte_to_pgoff(pte) (pte_val(pte) >> 3) #define pgoff_to_pte(off) ((pte_t) { ((off) << 3) | _PAGE_FILE }) +#ifndef CONFIG_PPC_4K_PAGES +void pgtable_cache_init(void); +#else /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) +#endif extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp); diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index cf11342..730dc2d 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -73,13 +73,25 @@ extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa); #define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT) +#ifndef CONFIG_PPC_4K_PAGES +static struct kmem_cache *pgtable_cache; + +void pgtable_cache_init(void) +{ + pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER, + 1 << PGDIR_ORDER, 0, NULL); + if (pgtable_cache == NULL) + panic("Couldn't allocate pgtable caches"); +} +#endif + pgd_t *pgd_alloc(struct mm_struct *mm) { pgd_t *ret; /* pgdir take page or two with 4K pages and a page fraction otherwise */ #ifndef CONFIG_PPC_4K_PAGES - ret = kzalloc(1 << PGDIR_ORDER, GFP_KERNEL); + ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO); #else ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, PGDIR_ORDER - PAGE_SHIFT); @@ -90,7 +102,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm) void pgd_free(struct mm_struct *mm, pgd_t *pgd) { #ifndef CONFIG_PPC_4K_PAGES - kfree((void *)pgd); + kmem_cache_free(pgtable_cache, (void *)pgd); #else free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT); #endif -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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