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Date: Thu, 7 Jan 2016 10:57:56 +0100
From: Michal Hocko <mhocko@...nel.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <peterz@...radead.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Minchan Kim <minchan@...nel.org>,
Sasha Levin <sasha.levin@...cle.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH v3 06/14] mm, debug: replace dump_flags() with the new
printk formats
On Fri 18-12-15 10:03:18, Vlastimil Babka wrote:
> With the new printk format strings for flags, we can get rid of dump_flags()
> in mm/debug.c.
>
> This also fixes dump_vma() which used dump_flags() for printing vma flags.
> However dump_flags() did a page-flags specific filtering of bits higher than
> NR_PAGEFLAGS in order to remove the zone id part. For dump_vma() this resulted
> in removing several VM_* flags from the symbolic translation.
>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Sasha Levin <sasha.levin@...cle.com>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Michal Hocko <mhocko@...e.cz>
Nice simplification for sure!
Acked-by: Michal Hocko <mhocko@...e.com>
> ---
> mm/debug.c | 60 ++++++++++++++----------------------------------------------
> 1 file changed, 14 insertions(+), 46 deletions(-)
>
> diff --git a/mm/debug.c b/mm/debug.c
> index 79621a5ce46f..5ea57bc49ef6 100644
> --- a/mm/debug.c
> +++ b/mm/debug.c
> @@ -28,36 +28,6 @@ const struct trace_print_flags vmaflag_names[] = {
> {0, NULL}
> };
>
> -static void dump_flags(unsigned long flags,
> - const struct trace_print_flags *names, int count)
> -{
> - const char *delim = "";
> - unsigned long mask;
> - int i;
> -
> - pr_emerg("flags: %#lx(", flags);
> -
> - /* remove zone id */
> - flags &= (1UL << NR_PAGEFLAGS) - 1;
> -
> - for (i = 0; i < count && flags; i++) {
> -
> - mask = names[i].mask;
> - if ((flags & mask) != mask)
> - continue;
> -
> - flags &= ~mask;
> - pr_cont("%s%s", delim, names[i].name);
> - delim = "|";
> - }
> -
> - /* check for left over flags */
> - if (flags)
> - pr_cont("%s%#lx", delim, flags);
> -
> - pr_cont(")\n");
> -}
> -
> void dump_page_badflags(struct page *page, const char *reason,
> unsigned long badflags)
> {
> @@ -68,15 +38,15 @@ void dump_page_badflags(struct page *page, const char *reason,
> pr_cont(" compound_mapcount: %d", compound_mapcount(page));
> pr_cont("\n");
> BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
> - dump_flags(page->flags, pageflag_names,
> - ARRAY_SIZE(pageflag_names) - 1);
> + pr_emerg("flags: %#lx(%pgp)\n", page->flags, &page->flags);
> +
> if (reason)
> pr_alert("page dumped because: %s\n", reason);
> - if (page->flags & badflags) {
> - pr_alert("bad because of flags:\n");
> - dump_flags(page->flags & badflags, pageflag_names,
> - ARRAY_SIZE(pageflag_names) - 1);
> - }
> +
> + badflags &= page->flags;
> + if (badflags)
> + pr_alert("bad because of flags: %#lx(%pgp)\n", badflags,
> + &badflags);
> #ifdef CONFIG_MEMCG
> if (page->mem_cgroup)
> pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
> @@ -96,13 +66,14 @@ void dump_vma(const struct vm_area_struct *vma)
> pr_emerg("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",
> + "pgoff %lx file %p private_data %p\n"
> + "flags: %#lx(%pgv)\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, vmaflag_names, ARRAY_SIZE(vmaflag_names) - 1);
> + vma->vm_file, vma->vm_private_data,
> + vma->vm_flags, &vma->vm_flags);
> }
> EXPORT_SYMBOL(dump_vma);
>
> @@ -136,7 +107,7 @@ void dump_mm(const struct mm_struct *mm)
> #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
> "tlb_flush_pending %d\n"
> #endif
> - "%s", /* This is here to hold the comma */
> + "def_flags: %#lx(%pgv)\n",
>
> mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
> #ifdef CONFIG_MMU
> @@ -170,11 +141,8 @@ void dump_mm(const struct mm_struct *mm)
> #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
> mm->tlb_flush_pending,
> #endif
> - "" /* This is here to not have a comma! */
> - );
> -
> - dump_flags(mm->def_flags, vmaflag_names,
> - ARRAY_SIZE(vmaflag_names) - 1);
> + mm->def_flags, &mm->def_flags
> + );
> }
>
> #endif /* CONFIG_DEBUG_VM */
> --
> 2.6.3
--
Michal Hocko
SUSE Labs
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