From: js1304@gmail.com
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Takashi Iwai <tiwai@suse.com>,
Chris Metcalf <cmetcalf@ezchip.com>,
Christoph Lameter <cl@linux.com>,
linux-api@vger.kernel.org, Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: [PATCH v2 4/5] powerpc: query dynamic DEBUG_PAGEALLOC setting
Date: Thu, 11 Feb 2016 13:05:00 +0900 [thread overview]
Message-ID: <1455163501-9341-5-git-send-email-iamjoonsoo.kim@lge.com> (raw)
In-Reply-To: <1455163501-9341-1-git-send-email-iamjoonsoo.kim@lge.com>
From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
We can disable debug_pagealloc processing even if the code is compiled
with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query
whether it is enabled or not in runtime.
v2: fix build failure
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
arch/powerpc/kernel/traps.c | 5 ++---
arch/powerpc/mm/hash_utils_64.c | 36 ++++++++++++++++++++----------------
arch/powerpc/mm/init_32.c | 8 ++++----
3 files changed, 26 insertions(+), 23 deletions(-)
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index b6becc7..33c47fc 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -203,9 +203,8 @@ static int __kprobes __die(const char *str, struct pt_regs *regs, long err)
#ifdef CONFIG_SMP
printk("SMP NR_CPUS=%d ", NR_CPUS);
#endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
- printk("DEBUG_PAGEALLOC ");
-#endif
+ if (debug_pagealloc_enabled())
+ printk("DEBUG_PAGEALLOC ");
#ifdef CONFIG_NUMA
printk("NUMA ");
#endif
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index ba59d59..1005281 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -255,8 +255,10 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
if (ret < 0)
break;
+
#ifdef CONFIG_DEBUG_PAGEALLOC
- if ((paddr >> PAGE_SHIFT) < linear_map_hash_count)
+ if (debug_pagealloc_enabled() &&
+ (paddr >> PAGE_SHIFT) < linear_map_hash_count)
linear_map_hash_slots[paddr >> PAGE_SHIFT] = ret | 0x80;
#endif /* CONFIG_DEBUG_PAGEALLOC */
}
@@ -512,17 +514,17 @@ static void __init htab_init_page_sizes(void)
if (mmu_has_feature(MMU_FTR_16M_PAGE))
memcpy(mmu_psize_defs, mmu_psize_defaults_gp,
sizeof(mmu_psize_defaults_gp));
- found:
-#ifndef CONFIG_DEBUG_PAGEALLOC
- /*
- * Pick a size for the linear mapping. Currently, we only support
- * 16M, 1M and 4K which is the default
- */
- if (mmu_psize_defs[MMU_PAGE_16M].shift)
- mmu_linear_psize = MMU_PAGE_16M;
- else if (mmu_psize_defs[MMU_PAGE_1M].shift)
- mmu_linear_psize = MMU_PAGE_1M;
-#endif /* CONFIG_DEBUG_PAGEALLOC */
+found:
+ if (!debug_pagealloc_enabled()) {
+ /*
+ * Pick a size for the linear mapping. Currently, we only
+ * support 16M, 1M and 4K which is the default
+ */
+ if (mmu_psize_defs[MMU_PAGE_16M].shift)
+ mmu_linear_psize = MMU_PAGE_16M;
+ else if (mmu_psize_defs[MMU_PAGE_1M].shift)
+ mmu_linear_psize = MMU_PAGE_1M;
+ }
#ifdef CONFIG_PPC_64K_PAGES
/*
@@ -721,10 +723,12 @@ static void __init htab_initialize(void)
prot = pgprot_val(PAGE_KERNEL);
#ifdef CONFIG_DEBUG_PAGEALLOC
- linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
- linear_map_hash_slots = __va(memblock_alloc_base(linear_map_hash_count,
- 1, ppc64_rma_size));
- memset(linear_map_hash_slots, 0, linear_map_hash_count);
+ if (debug_pagealloc_enabled()) {
+ linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
+ linear_map_hash_slots = __va(memblock_alloc_base(
+ linear_map_hash_count, 1, ppc64_rma_size));
+ memset(linear_map_hash_slots, 0, linear_map_hash_count);
+ }
#endif /* CONFIG_DEBUG_PAGEALLOC */
/* On U3 based machines, we need to reserve the DART area and
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index a10be66..c2b7716 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -112,10 +112,10 @@ void __init MMU_setup(void)
if (strstr(boot_command_line, "noltlbs")) {
__map_without_ltlbs = 1;
}
-#ifdef CONFIG_DEBUG_PAGEALLOC
- __map_without_bats = 1;
- __map_without_ltlbs = 1;
-#endif
+ if (debug_pagealloc_enabled()) {
+ __map_without_bats = 1;
+ __map_without_ltlbs = 1;
+ }
}
/*
--
1.9.1
--
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next prev parent reply other threads:[~2016-02-11 4:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-11 4:04 [PATCH v2 0/5] follow-up "Optimize CONFIG_DEBUG_PAGEALLOC" js1304
2016-02-11 4:04 ` [PATCH v2 1/5] mm/vmalloc: query dynamic DEBUG_PAGEALLOC setting js1304
2016-02-11 4:04 ` [PATCH v2 2/5] mm/slub: " js1304
2016-02-11 12:17 ` Christian Borntraeger
2016-02-11 4:04 ` [PATCH v2 3/5] sound: " js1304
2016-02-11 4:05 ` js1304 [this message]
2016-02-11 4:05 ` [PATCH v2 5/5] tile: " js1304
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