From: Andrew Morton <akpm@linux-foundation.org>
To: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Linux MM <linux-mm@kvack.org>,
David Hansen <dave@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH 6/9] mm/page_alloc: add informative debugging message in page_outside_zone_boundaries()
Date: Fri, 1 Feb 2013 16:28:48 -0800 [thread overview]
Message-ID: <20130201162848.74bdb2a7.akpm@linux-foundation.org> (raw)
In-Reply-To: <1358463181-17956-7-git-send-email-cody@linux.vnet.ibm.com>
On Thu, 17 Jan 2013 14:52:58 -0800
Cody P Schafer <cody@linux.vnet.ibm.com> wrote:
> Add a debug message which prints when a page is found outside of the
> boundaries of the zone it should belong to. Format is:
> "page $pfn outside zone [ $start_pfn - $end_pfn ]"
>
> Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
> ---
> mm/page_alloc.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f8ed277..f1783cf 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -239,13 +239,20 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
> int ret = 0;
> unsigned seq;
> unsigned long pfn = page_to_pfn(page);
> + unsigned long sp, start_pfn;
>
> do {
> seq = zone_span_seqbegin(zone);
> + start_pfn = zone->zone_start_pfn;
> + sp = zone->spanned_pages;
> if (!zone_spans_pfn(zone, pfn))
> ret = 1;
> } while (zone_span_seqretry(zone, seq));
>
> + if (ret)
> + pr_debug("page %lu outside zone [ %lu - %lu ]\n",
> + pfn, start_pfn, start_pfn + sp);
> +
> return ret;
> }
As this condition leads to a VM_BUG_ON(), "pr_debug" seems rather wimpy
and I doubt if we need to be concerned about flooding the console.
I'll switch it to pr_err.
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next prev parent reply other threads:[~2013-02-02 0:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-17 22:52 [PATCH v2 0/9] mm: zone & pgdat accessors plus some cleanup Cody P Schafer
2013-01-17 22:52 ` [PATCH 1/9] mm: add SECTION_IN_PAGE_FLAGS Cody P Schafer
2013-02-02 0:20 ` Andrew Morton
2013-02-05 22:23 ` Cody P Schafer
2013-01-17 22:52 ` [PATCH 2/9] mm: add & use zone_end_pfn() and zone_spans_pfn() Cody P Schafer
2013-01-17 22:52 ` [PATCH 3/9] mm: add zone_is_empty() and zone_is_initialized() Cody P Schafer
2013-01-17 22:52 ` [PATCH 4/9] mm/page_alloc: add a VM_BUG in __free_one_page() if the zone is uninitialized Cody P Schafer
2013-01-17 22:52 ` [PATCH 5/9] mmzone: add pgdat_{end_pfn,is_empty}() helpers & consolidate Cody P Schafer
2013-02-02 0:23 ` Andrew Morton
2013-01-17 22:52 ` [PATCH 6/9] mm/page_alloc: add informative debugging message in page_outside_zone_boundaries() Cody P Schafer
2013-02-02 0:28 ` Andrew Morton [this message]
2013-02-02 0:29 ` Andrew Morton
2013-02-05 22:20 ` Cody P Schafer
2013-01-17 22:52 ` [PATCH 7/9] mm: add helper ensure_zone_is_initialized() Cody P Schafer
2013-01-17 22:53 ` [PATCH 8/9] mm/memory_hotplug: use ensure_zone_is_initialized() Cody P Schafer
2013-01-17 22:53 ` [PATCH 9/9] mm/memory_hotplug: use pgdat_end_pfn() instead of open coding the same Cody P Schafer
2013-02-02 0:39 ` [PATCH v2 0/9] mm: zone & pgdat accessors plus some cleanup Andrew Morton
2013-02-05 22:59 ` Cody P Schafer
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