From 0bf55139782db1fa96af66e37cc84afde18443ef Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Thu, 9 Oct 2014 15:28:06 -0700 Subject: [PATCH] mm: introduce dump_vma Introduce a helper to dump information about a VMA, this also makes dump_page_flags more generic and re-uses that so the output looks very similar to dump_page: [ 61.903437] vma ffff88070f88be00 start 00007fff25970000 end 00007fff25992000 [ 61.903437] next ffff88070facd600 prev ffff88070face400 mm ffff88070fade000 [ 61.903437] prot 8000000000000025 anon_vma ffff88070fa1e200 vm_ops (null) [ 61.903437] pgoff 7ffffffdd file (null) private_data (null) [ 61.909129] flags: 0x100173(read|write|mayread|maywrite|mayexec|growsdown|account) [akpm@linux-foundation.org: make dump_vma() require CONFIG_DEBUG_VM] [swarren@nvidia.com: fix dump_vma() compilation] Signed-off-by: Sasha Levin Reviewed-by: Naoya Horiguchi Cc: Kirill A. Shutemov Cc: Konstantin Khlebnikov Cc: Rik van Riel Cc: Mel Gorman Cc: Michal Hocko Cc: Hugh Dickins Cc: Vlastimil Babka Cc: Michel Lespinasse Cc: Minchan Kim Signed-off-by: Stephen Warren Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mmdebug.h | 2 + mm/page_alloc.c | 82 ++++++++++++++++++++++++++++++++++++----- 2 files changed, 75 insertions(+), 9 deletions(-) diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h index 2f348d02f640..dfb93333fc62 100644 --- a/include/linux/mmdebug.h +++ b/include/linux/mmdebug.h @@ -4,10 +4,12 @@ #include struct page; +struct vm_area_struct; extern void dump_page(struct page *page, const char *reason); extern void dump_page_badflags(struct page *page, const char *reason, unsigned long badflags); +void dump_vma(const struct vm_area_struct *vma); #ifdef CONFIG_DEBUG_VM #define VM_BUG_ON(cond) BUG_ON(cond) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f07588b11d59..3a950144f80b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6626,27 +6626,26 @@ static const struct trace_print_flags pageflag_names[] = { #endif }; -static void dump_page_flags(unsigned long flags) +static void dump_flags(unsigned long flags, + const struct trace_print_flags *names, int count) { const char *delim = ""; unsigned long mask; int i; - BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS); - - printk(KERN_ALERT "page flags: %#lx(", flags); + printk(KERN_ALERT "flags: %#lx(", flags); /* remove zone id */ flags &= (1UL << NR_PAGEFLAGS) - 1; - for (i = 0; i < ARRAY_SIZE(pageflag_names) && flags; i++) { + for (i = 0; i < count && flags; i++) { - mask = pageflag_names[i].mask; + mask = names[i].mask; if ((flags & mask) != mask) continue; flags &= ~mask; - printk("%s%s", delim, pageflag_names[i].name); + printk("%s%s", delim, names[i].name); delim = "|"; } @@ -6664,12 +6663,14 @@ void dump_page_badflags(struct page *page, const char *reason, "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n", page, atomic_read(&page->_count), page_mapcount(page), page->mapping, page->index); - dump_page_flags(page->flags); + BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS); + dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names)); if (reason) pr_alert("page dumped because: %s\n", reason); if (page->flags & badflags) { pr_alert("bad because of flags:\n"); - dump_page_flags(page->flags & badflags); + dump_flags(page->flags & badflags, + pageflag_names, ARRAY_SIZE(pageflag_names)); } mem_cgroup_print_bad_page(page); } @@ -6679,3 +6680,66 @@ void dump_page(struct page *page, const char *reason) dump_page_badflags(page, reason, 0); } EXPORT_SYMBOL(dump_page); + +#ifdef CONFIG_DEBUG_VM + +static const struct trace_print_flags vmaflags_names[] = { + {VM_READ, "read" }, + {VM_WRITE, "write" }, + {VM_EXEC, "exec" }, + {VM_SHARED, "shared" }, + {VM_MAYREAD, "mayread" }, + {VM_MAYWRITE, "maywrite" }, + {VM_MAYEXEC, "mayexec" }, + {VM_MAYSHARE, "mayshare" }, + {VM_GROWSDOWN, "growsdown" }, + {VM_PFNMAP, "pfnmap" }, + {VM_DENYWRITE, "denywrite" }, + {VM_LOCKED, "locked" }, + {VM_IO, "io" }, + {VM_SEQ_READ, "seqread" }, + {VM_RAND_READ, "randread" }, + {VM_DONTCOPY, "dontcopy" }, + {VM_DONTEXPAND, "dontexpand" }, + {VM_ACCOUNT, "account" }, + {VM_NORESERVE, "noreserve" }, + {VM_HUGETLB, "hugetlb" }, + {VM_NONLINEAR, "nonlinear" }, +#if defined(CONFIG_X86) + {VM_PAT, "pat" }, +#elif defined(CONFIG_PPC) + {VM_SAO, "sao" }, +#elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64) + {VM_GROWSUP, "growsup" }, +#elif !defined(CONFIG_MMU) + {VM_MAPPED_COPY, "mappedcopy" }, +#else + {VM_ARCH_1, "arch_1" }, +#endif + {VM_DONTDUMP, "dontdump" }, +#ifdef CONFIG_MEM_SOFT_DIRTY + {VM_SOFTDIRTY, "softdirty" }, +#endif + {VM_MIXEDMAP, "mixedmap" }, + {VM_HUGEPAGE, "hugepage" }, + {VM_NOHUGEPAGE, "nohugepage" }, + {VM_MERGEABLE, "mergeable" }, +}; + +void dump_vma(const struct vm_area_struct *vma) +{ + printk(KERN_ALERT + "vma %p start %p end %p\n" + "next %p prev %p mm %p\n" + "prot %lx anon_vma %p vm_ops %p\n" + "pgoff %lx file %p private_data %p\n", + vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, + vma->vm_prev, vma->vm_mm, + (unsigned long)pgprot_val(vma->vm_page_prot), + vma->anon_vma, vma->vm_ops, vma->vm_pgoff, + vma->vm_file, vma->vm_private_data); + dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names)); +} +EXPORT_SYMBOL(dump_vma); + +#endif /* CONFIG_DEBUG_VM */ -- 2.20.1