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 <sasha.levin@oracle.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Michel Lespinasse <walken@google.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -4,10 +4,12 @@
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#include <linux/stringify.h>
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struct page;
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struct vm_area_struct;
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extern void dump_page(struct page *page, const char *reason);
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extern void dump_page_badflags(struct page *page, const char *reason,
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unsigned long badflags);
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void dump_vma(const struct vm_area_struct *vma);
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#ifdef CONFIG_DEBUG_VM
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#define VM_BUG_ON(cond) BUG_ON(cond)
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@ -6626,27 +6626,26 @@ static const struct trace_print_flags pageflag_names[] = {
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#endif
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};
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static void dump_page_flags(unsigned long flags)
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static void dump_flags(unsigned long flags,
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const struct trace_print_flags *names, int count)
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{
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const char *delim = "";
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unsigned long mask;
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int i;
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BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
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printk(KERN_ALERT "page flags: %#lx(", flags);
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printk(KERN_ALERT "flags: %#lx(", flags);
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/* remove zone id */
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flags &= (1UL << NR_PAGEFLAGS) - 1;
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for (i = 0; i < ARRAY_SIZE(pageflag_names) && flags; i++) {
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for (i = 0; i < count && flags; i++) {
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mask = pageflag_names[i].mask;
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mask = names[i].mask;
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if ((flags & mask) != mask)
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continue;
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flags &= ~mask;
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printk("%s%s", delim, pageflag_names[i].name);
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printk("%s%s", delim, names[i].name);
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delim = "|";
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}
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@ -6664,12 +6663,14 @@ void dump_page_badflags(struct page *page, const char *reason,
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"page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
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page, atomic_read(&page->_count), page_mapcount(page),
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page->mapping, page->index);
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dump_page_flags(page->flags);
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BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
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dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
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if (reason)
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pr_alert("page dumped because: %s\n", reason);
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if (page->flags & badflags) {
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pr_alert("bad because of flags:\n");
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dump_page_flags(page->flags & badflags);
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dump_flags(page->flags & badflags,
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pageflag_names, ARRAY_SIZE(pageflag_names));
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}
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mem_cgroup_print_bad_page(page);
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}
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@ -6679,3 +6680,66 @@ void dump_page(struct page *page, const char *reason)
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dump_page_badflags(page, reason, 0);
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}
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EXPORT_SYMBOL(dump_page);
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#ifdef CONFIG_DEBUG_VM
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static const struct trace_print_flags vmaflags_names[] = {
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{VM_READ, "read" },
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{VM_WRITE, "write" },
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{VM_EXEC, "exec" },
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{VM_SHARED, "shared" },
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{VM_MAYREAD, "mayread" },
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{VM_MAYWRITE, "maywrite" },
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{VM_MAYEXEC, "mayexec" },
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{VM_MAYSHARE, "mayshare" },
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{VM_GROWSDOWN, "growsdown" },
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{VM_PFNMAP, "pfnmap" },
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{VM_DENYWRITE, "denywrite" },
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{VM_LOCKED, "locked" },
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{VM_IO, "io" },
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{VM_SEQ_READ, "seqread" },
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{VM_RAND_READ, "randread" },
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{VM_DONTCOPY, "dontcopy" },
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{VM_DONTEXPAND, "dontexpand" },
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{VM_ACCOUNT, "account" },
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{VM_NORESERVE, "noreserve" },
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{VM_HUGETLB, "hugetlb" },
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{VM_NONLINEAR, "nonlinear" },
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#if defined(CONFIG_X86)
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{VM_PAT, "pat" },
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#elif defined(CONFIG_PPC)
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{VM_SAO, "sao" },
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#elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
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{VM_GROWSUP, "growsup" },
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#elif !defined(CONFIG_MMU)
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{VM_MAPPED_COPY, "mappedcopy" },
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#else
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{VM_ARCH_1, "arch_1" },
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#endif
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{VM_DONTDUMP, "dontdump" },
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#ifdef CONFIG_MEM_SOFT_DIRTY
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{VM_SOFTDIRTY, "softdirty" },
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#endif
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{VM_MIXEDMAP, "mixedmap" },
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{VM_HUGEPAGE, "hugepage" },
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{VM_NOHUGEPAGE, "nohugepage" },
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{VM_MERGEABLE, "mergeable" },
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};
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void dump_vma(const struct vm_area_struct *vma)
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{
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printk(KERN_ALERT
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"vma %p start %p end %p\n"
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"next %p prev %p mm %p\n"
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"prot %lx anon_vma %p vm_ops %p\n"
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"pgoff %lx file %p private_data %p\n",
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vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
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vma->vm_prev, vma->vm_mm,
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(unsigned long)pgprot_val(vma->vm_page_prot),
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vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
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vma->vm_file, vma->vm_private_data);
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dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
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}
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EXPORT_SYMBOL(dump_vma);
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#endif /* CONFIG_DEBUG_VM */
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