From patchwork Mon Feb 12 18:12:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 872246 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3zgDND0bBKz9s7f for ; Tue, 13 Feb 2018 05:14:52 +1100 (AEDT) Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3zgDNC6VjPzF0rK for ; Tue, 13 Feb 2018 05:14:51 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=c-s.fr (client-ip=93.17.236.30; helo=pegase1.c-s.fr; envelope-from=christophe.leroy@c-s.fr; receiver=) Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3zgDKS42BgzF0r8 for ; Tue, 13 Feb 2018 05:12:27 +1100 (AEDT) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 3zgDKF07kkz9tvMq; Mon, 12 Feb 2018 19:12:17 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id ZpYZ6N3WX2lW; Mon, 12 Feb 2018 19:12:16 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 3zgDKD6cH8z9tvMh; Mon, 12 Feb 2018 19:12:16 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 206FD8B96C; Mon, 12 Feb 2018 19:12:23 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id QEURn1Qe6ilc; Mon, 12 Feb 2018 19:12:23 +0100 (CET) Received: from po15720vm.idsi0.si.c-s.fr (unknown [192.168.232.3]) by messagerie.si.c-s.fr (Postfix) with ESMTP id B8E4A8B962; Mon, 12 Feb 2018 19:12:22 +0100 (CET) Received: by po15720vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 7318C67B0B; Mon, 12 Feb 2018 19:12:22 +0100 (CET) Message-Id: <02a62db83282b5ef3e0e8281fdc46fa91beffc86.1518382747.git.christophe.leroy@c-s.fr> From: Christophe Leroy Subject: [RFC REBASED 1/5] powerpc/mm/slice: pass pointers to struct slice_mask where possible To: Nicholas Piggin Date: Mon, 12 Feb 2018 19:12:22 +0100 (CET) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Pass around const pointers to struct slice_mask where possible, rather than copies of slice_mask, to reduce stack and call overhead. checkstack.pl gives, before: 0x00000de4 slice_get_unmapped_area [slice.o]: 656 0x00001b4c is_hugepage_only_range [slice.o]: 512 0x0000075c slice_find_area_topdown [slice.o]: 416 0x000004c8 slice_find_area_bottomup.isra.1 [slice.o]: 272 0x00001aa0 slice_set_range_psize [slice.o]: 240 0x00000a64 slice_find_area [slice.o]: 176 0x00000174 slice_check_fit [slice.o]: 112 after: 0x00000bd4 slice_get_unmapped_area [slice.o]: 496 0x000017cc is_hugepage_only_range [slice.o]: 352 0x00000758 slice_find_area [slice.o]: 144 0x00001750 slice_set_range_psize [slice.o]: 144 0x00000180 slice_check_fit [slice.o]: 128 0x000005b0 slice_find_area_bottomup.isra.2 [slice.o]: 128 Signed-off-by: Nicholas Piggin Signed-off-by: Christophe Leroy --- rebased on top of "[v4,3/5] powerpc/mm/slice: Fix hugepage allocation at hint address on 8xx" (https://patchwork.ozlabs.org/patch/871675/) arch/powerpc/mm/slice.c | 81 +++++++++++++++++++++++++++---------------------- 1 file changed, 44 insertions(+), 37 deletions(-) diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c index 549704dfa777..db1278ac21c2 100644 --- a/arch/powerpc/mm/slice.c +++ b/arch/powerpc/mm/slice.c @@ -50,19 +50,21 @@ struct slice_mask { #ifdef DEBUG int _slice_debug = 1; -static void slice_print_mask(const char *label, struct slice_mask mask) +static void slice_print_mask(const char *label, const struct slice_mask *mask) { if (!_slice_debug) return; - pr_devel("%s low_slice: %*pbl\n", label, (int)SLICE_NUM_LOW, &mask.low_slices); - pr_devel("%s high_slice: %*pbl\n", label, (int)SLICE_NUM_HIGH, mask.high_slices); + pr_devel("%s low_slice: %*pbl\n", label, + (int)SLICE_NUM_LOW, &mask->low_slices); + pr_devel("%s high_slice: %*pbl\n", label, + (int)SLICE_NUM_HIGH, mask->high_slices); } #define slice_dbg(fmt...) do { if (_slice_debug) pr_devel(fmt); } while (0) #else -static void slice_print_mask(const char *label, struct slice_mask mask) {} +static void slice_print_mask(const char *label, const struct slice_mask *mask) {} #define slice_dbg(fmt...) #endif @@ -145,7 +147,8 @@ static void slice_mask_for_free(struct mm_struct *mm, struct slice_mask *ret, __set_bit(i, ret->high_slices); } -static void slice_mask_for_size(struct mm_struct *mm, int psize, struct slice_mask *ret, +static void slice_mask_for_size(struct mm_struct *mm, int psize, + struct slice_mask *ret, unsigned long high_limit) { unsigned char *hpsizes; @@ -174,7 +177,8 @@ static void slice_mask_for_size(struct mm_struct *mm, int psize, struct slice_ma } static int slice_check_fit(struct mm_struct *mm, - struct slice_mask mask, struct slice_mask available) + const struct slice_mask *mask, + const struct slice_mask *available) { DECLARE_BITMAP(result, SLICE_NUM_HIGH); /* @@ -183,11 +187,11 @@ static int slice_check_fit(struct mm_struct *mm, */ unsigned long slice_count = GET_HIGH_SLICE_INDEX(mm->context.slb_addr_limit); - slice_bitmap_and(result, mask.high_slices, available.high_slices, + slice_bitmap_and(result, mask->high_slices, available->high_slices, slice_count); - return (mask.low_slices & available.low_slices) == mask.low_slices && - slice_bitmap_equal(result, mask.high_slices, slice_count); + return (mask->low_slices & available->low_slices) == mask->low_slices && + slice_bitmap_equal(result, mask->high_slices, slice_count); } static void slice_flush_segments(void *parm) @@ -207,7 +211,8 @@ static void slice_flush_segments(void *parm) #endif } -static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psize) +static void slice_convert(struct mm_struct *mm, + const struct slice_mask *mask, int psize) { int index, mask_index; /* Write the new slice psize bits */ @@ -225,7 +230,7 @@ static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psiz lpsizes = mm->context.low_slices_psize; for (i = 0; i < SLICE_NUM_LOW; i++) - if (mask.low_slices & (1u << i)) + if (mask->low_slices & (1u << i)) lpsizes = (lpsizes & ~(0xful << (i * 4))) | (((unsigned long)psize) << (i * 4)); @@ -236,7 +241,7 @@ static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psiz for (i = 0; i < GET_HIGH_SLICE_INDEX(mm->context.slb_addr_limit); i++) { mask_index = i & 0x1; index = i >> 1; - if (test_bit(i, mask.high_slices)) + if (test_bit(i, mask->high_slices)) hpsizes[index] = (hpsizes[index] & ~(0xf << (mask_index * 4))) | (((unsigned long)psize) << (mask_index * 4)); @@ -259,26 +264,25 @@ static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psiz * 'available' slice_mark. */ static bool slice_scan_available(unsigned long addr, - struct slice_mask available, - int end, - unsigned long *boundary_addr) + const struct slice_mask *available, + int end, unsigned long *boundary_addr) { unsigned long slice; if (addr < SLICE_LOW_TOP) { slice = GET_LOW_SLICE_INDEX(addr); *boundary_addr = (slice + end) << SLICE_LOW_SHIFT; - return !!(available.low_slices & (1u << slice)); + return !!(available->low_slices & (1u << slice)); } else { slice = GET_HIGH_SLICE_INDEX(addr); *boundary_addr = (slice + end) ? ((slice + end) << SLICE_HIGH_SHIFT) : SLICE_LOW_TOP; - return !!test_bit(slice, available.high_slices); + return !!test_bit(slice, available->high_slices); } } static unsigned long slice_find_area_bottomup(struct mm_struct *mm, unsigned long len, - struct slice_mask available, + const struct slice_mask *available, int psize, unsigned long high_limit) { int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT); @@ -324,7 +328,7 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm, static unsigned long slice_find_area_topdown(struct mm_struct *mm, unsigned long len, - struct slice_mask available, + const struct slice_mask *available, int psize, unsigned long high_limit) { int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT); @@ -382,7 +386,7 @@ static unsigned long slice_find_area_topdown(struct mm_struct *mm, static unsigned long slice_find_area(struct mm_struct *mm, unsigned long len, - struct slice_mask mask, int psize, + const struct slice_mask *mask, int psize, int topdown, unsigned long high_limit) { if (topdown) @@ -391,14 +395,16 @@ static unsigned long slice_find_area(struct mm_struct *mm, unsigned long len, return slice_find_area_bottomup(mm, len, mask, psize, high_limit); } -static inline void slice_or_mask(struct slice_mask *dst, struct slice_mask *src) +static inline void slice_or_mask(struct slice_mask *dst, + const struct slice_mask *src) { dst->low_slices |= src->low_slices; slice_bitmap_or(dst->high_slices, dst->high_slices, src->high_slices, SLICE_NUM_HIGH); } -static inline void slice_andnot_mask(struct slice_mask *dst, struct slice_mask *src) +static inline void slice_andnot_mask(struct slice_mask *dst, + const struct slice_mask *src) { dst->low_slices &= ~src->low_slices; @@ -483,7 +489,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, * already */ slice_mask_for_size(mm, psize, &good_mask, high_limit); - slice_print_mask(" good_mask", good_mask); + slice_print_mask(" good_mask", &good_mask); /* * Here "good" means slices that are already the right page size, @@ -517,12 +523,12 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, if (addr != 0 || fixed) { /* Build a mask for the requested range */ slice_range_to_mask(addr, len, &mask); - slice_print_mask(" mask", mask); + slice_print_mask(" mask", &mask); /* Check if we fit in the good mask. If we do, we just return, * nothing else to do */ - if (slice_check_fit(mm, mask, good_mask)) { + if (slice_check_fit(mm, &mask, &good_mask)) { slice_dbg(" fits good !\n"); return addr; } @@ -530,7 +536,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, /* Now let's see if we can find something in the existing * slices for that size */ - newaddr = slice_find_area(mm, len, good_mask, + newaddr = slice_find_area(mm, len, &good_mask, psize, topdown, high_limit); if (newaddr != -ENOMEM) { /* Found within the good mask, we don't have to setup, @@ -546,9 +552,10 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, */ slice_mask_for_free(mm, &potential_mask, high_limit); slice_or_mask(&potential_mask, &good_mask); - slice_print_mask(" potential", potential_mask); + slice_print_mask(" potential", &potential_mask); - if ((addr != 0 || fixed) && slice_check_fit(mm, mask, potential_mask)) { + if ((addr != 0 || fixed) && + slice_check_fit(mm, &mask, &potential_mask)) { slice_dbg(" fits potential !\n"); goto convert; } @@ -563,7 +570,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, * anywhere in the good area. */ if (addr) { - addr = slice_find_area(mm, len, good_mask, + addr = slice_find_area(mm, len, &good_mask, psize, topdown, high_limit); if (addr != -ENOMEM) { slice_dbg(" found area at 0x%lx\n", addr); @@ -574,14 +581,14 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, /* Now let's see if we can find something in the existing slices * for that size plus free slices */ - addr = slice_find_area(mm, len, potential_mask, + addr = slice_find_area(mm, len, &potential_mask, psize, topdown, high_limit); #ifdef CONFIG_PPC_64K_PAGES if (addr == -ENOMEM && psize == MMU_PAGE_64K) { /* retry the search with 4k-page slices included */ slice_or_mask(&potential_mask, &compat_mask); - addr = slice_find_area(mm, len, potential_mask, + addr = slice_find_area(mm, len, &potential_mask, psize, topdown, high_limit); } #endif @@ -591,14 +598,14 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, slice_range_to_mask(addr, len, &mask); slice_dbg(" found potential area at 0x%lx\n", addr); - slice_print_mask(" mask", mask); + slice_print_mask(" mask", &mask); convert: slice_andnot_mask(&mask, &good_mask); slice_andnot_mask(&mask, &compat_mask); if (mask.low_slices || !slice_bitmap_empty(mask.high_slices, SLICE_NUM_HIGH)) { - slice_convert(mm, mask, psize); + slice_convert(mm, &mask, psize); if (psize > MMU_PAGE_BASE) on_each_cpu(slice_flush_segments, mm, 1); } @@ -727,7 +734,7 @@ void slice_set_range_psize(struct mm_struct *mm, unsigned long start, VM_BUG_ON(radix_enabled()); slice_range_to_mask(start, len, &mask); - slice_convert(mm, mask, psize); + slice_convert(mm, &mask, psize); } #ifdef CONFIG_HUGETLB_PAGE @@ -774,9 +781,9 @@ int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, #if 0 /* too verbose */ slice_dbg("is_hugepage_only_range(mm=%p, addr=%lx, len=%lx)\n", mm, addr, len); - slice_print_mask(" mask", mask); - slice_print_mask(" available", available); + slice_print_mask(" mask", &mask); + slice_print_mask(" available", &available); #endif - return !slice_check_fit(mm, mask, available); + return !slice_check_fit(mm, &mask, &available); } #endif