fe896d1878
The success of CMA allocation largely depends on the success of migration and key factor of it is page reference count. Until now, page reference is manipulated by direct calling atomic functions so we cannot follow up who and where manipulate it. Then, it is hard to find actual reason of CMA allocation failure. CMA allocation should be guaranteed to succeed so finding offending place is really important. In this patch, call sites where page reference is manipulated are converted to introduced wrapper function. This is preparation step to add tracepoint to each page reference manipulation function. With this facility, we can easily find reason of CMA allocation failure. There is no functional change in this patch. In addition, this patch also converts reference read sites. It will help a second step that renames page._count to something else and prevents later attempt to direct access to it (Suggested by Andrew). Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Minchan Kim <minchan@kernel.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
158 lines
4.0 KiB
C
158 lines
4.0 KiB
C
/*
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* mm/debug.c
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*
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* mm/ specific debug routines.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/trace_events.h>
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#include <linux/memcontrol.h>
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#include <trace/events/mmflags.h>
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#include <linux/migrate.h>
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#include <linux/page_owner.h>
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#include "internal.h"
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char *migrate_reason_names[MR_TYPES] = {
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"compaction",
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"memory_failure",
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"memory_hotplug",
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"syscall_or_cpuset",
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"mempolicy_mbind",
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"numa_misplaced",
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"cma",
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};
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const struct trace_print_flags pageflag_names[] = {
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__def_pageflag_names,
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{0, NULL}
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};
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const struct trace_print_flags gfpflag_names[] = {
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__def_gfpflag_names,
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{0, NULL}
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};
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const struct trace_print_flags vmaflag_names[] = {
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__def_vmaflag_names,
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{0, NULL}
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};
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void __dump_page(struct page *page, const char *reason)
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{
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pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
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page, page_ref_count(page), page_mapcount(page),
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page->mapping, page->index);
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if (PageCompound(page))
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pr_cont(" compound_mapcount: %d", compound_mapcount(page));
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pr_cont("\n");
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BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
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pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
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if (reason)
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pr_alert("page dumped because: %s\n", reason);
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#ifdef CONFIG_MEMCG
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if (page->mem_cgroup)
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pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
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#endif
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}
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void dump_page(struct page *page, const char *reason)
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{
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__dump_page(page, reason);
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dump_page_owner(page);
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}
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EXPORT_SYMBOL(dump_page);
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#ifdef CONFIG_DEBUG_VM
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void dump_vma(const struct vm_area_struct *vma)
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{
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pr_emerg("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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"flags: %#lx(%pGv)\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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vma->vm_flags, &vma->vm_flags);
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}
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EXPORT_SYMBOL(dump_vma);
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void dump_mm(const struct mm_struct *mm)
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{
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pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
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#ifdef CONFIG_MMU
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"get_unmapped_area %p\n"
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#endif
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"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
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"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
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"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
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"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
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"start_code %lx end_code %lx start_data %lx end_data %lx\n"
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"start_brk %lx brk %lx start_stack %lx\n"
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"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
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"binfmt %p flags %lx core_state %p\n"
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#ifdef CONFIG_AIO
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"ioctx_table %p\n"
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#endif
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#ifdef CONFIG_MEMCG
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"owner %p "
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#endif
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"exe_file %p\n"
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#ifdef CONFIG_MMU_NOTIFIER
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"mmu_notifier_mm %p\n"
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
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#endif
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#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
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"tlb_flush_pending %d\n"
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#endif
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"def_flags: %#lx(%pGv)\n",
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mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
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#ifdef CONFIG_MMU
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mm->get_unmapped_area,
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#endif
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mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
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mm->pgd, atomic_read(&mm->mm_users),
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atomic_read(&mm->mm_count),
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atomic_long_read((atomic_long_t *)&mm->nr_ptes),
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mm_nr_pmds((struct mm_struct *)mm),
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mm->map_count,
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mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
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mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
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mm->start_code, mm->end_code, mm->start_data, mm->end_data,
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mm->start_brk, mm->brk, mm->start_stack,
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mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
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mm->binfmt, mm->flags, mm->core_state,
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#ifdef CONFIG_AIO
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mm->ioctx_table,
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#endif
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#ifdef CONFIG_MEMCG
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mm->owner,
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#endif
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mm->exe_file,
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#ifdef CONFIG_MMU_NOTIFIER
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mm->mmu_notifier_mm,
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
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#endif
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#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
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mm->tlb_flush_pending,
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#endif
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mm->def_flags, &mm->def_flags
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);
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}
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#endif /* CONFIG_DEBUG_VM */
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