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Date: Mon, 10 Apr 2017 13:59:03 +0530
From: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: n-horiguchi@...jp.nec.com, akpm@...ux-foundation.org
Subject: [PATCH] mm/madvise: Clean up MADV_SOFT_OFFLINE and MADV_HWPOISON
This cleans up handling MADV_SOFT_OFFLINE and MADV_HWPOISON called
through madvise() system call.
* madvise_memory_failure() was misleading to accommodate handling of
both memory_failure() as well as soft_offline_page() functions.
Basically it handles memory error injection from user space which
can go either way as memory failure or soft offline. Renamed as
madvise_inject_error() instead.
* Renamed struct page pointer 'p' to 'page'.
* pr_info() was essentially printing PFN value but it said 'page'
which was misleading. Made the process virtual address explicit.
Before the patch:
[97216.813999] Soft offlining page 0x15e3e at 0x3fff8c230000
[97234.670320] Soft offlining page 0x1f3 at 0x3fffa0da0000
[97318.817426] Soft offlining page 0x744 at 0x3fff7d200000
[97319.537899] Soft offlining page 0x1634d at 0x3fff95e20000
[97319.538528] Soft offlining page 0x16349 at 0x3fff95e30000
[97326.714138] Soft offlining page 0x1d6 at 0x3fff9e8b0000
[97327.334351] Soft offlining page 0x5f3 at 0x3fff91bd0000
[97593.860913] Injecting memory failure for page 0x15c8b at 0x3fff83280000
[97593.861757] Injecting memory failure for page 0x16190 at 0x3fff83290000
[97594.430585] Injecting memory failure for page 0x740 at 0x3fff9a2e0000
[97594.431289] Injecting memory failure for page 0x741 at 0x3fff9a2f0000
After the patch:
[ 707.219172] Soft offlining pfn 0x1484e at process virtual address 0x3fff883c0000
[ 707.219178] Soft offlining pfn 0x1484f at process virtual address 0x3fff883d0000
[ 707.219185] Soft offlining pfn 0x14850 at process virtual address 0x3fff883e0000
[ 707.219192] Soft offlining pfn 0x14851 at process virtual address 0x3fff883f0000
[ 707.219199] Soft offlining pfn 0x14852 at process virtual address 0x3fff88400000
[ 707.219207] Soft offlining pfn 0x14853 at process virtual address 0x3fff88410000
[ 707.219214] Soft offlining pfn 0x14854 at process virtual address 0x3fff88420000
[ 710.231938] Soft offlining pfn 0x1521c at process virtual address 0x3fff6bc70000
[ 746.630823] Injecting memory failure for pfn 0x10fcf at process virtual address 0x3fff86310000
[ 746.630832] Injecting memory failure for pfn 0x10fd0 at process virtual address 0x3fff86320000
[ 746.630842] Injecting memory failure for pfn 0x10fd1 at process virtual address 0x3fff86330000
[ 746.630851] Injecting memory failure for pfn 0x10fd2 at process virtual address 0x3fff86340000
[ 746.630861] Injecting memory failure for pfn 0x10fd3 at process virtual address 0x3fff86350000
[ 746.630870] Injecting memory failure for pfn 0x10fd4 at process virtual address 0x3fff86360000
[ 746.630880] Injecting memory failure for pfn 0x10fd5 at process virtual address 0x3fff86370000
Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
mm/madvise.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/mm/madvise.c b/mm/madvise.c
index 7a2abf0..efd4721 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -606,34 +606,40 @@ static long madvise_remove(struct vm_area_struct *vma,
/*
* Error injection support for memory error handling.
*/
-static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
+static int madvise_inject_error(int behavior,
+ unsigned long start, unsigned long end)
{
- struct page *p;
+ struct page *page;
+
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
+
for (; start < end; start += PAGE_SIZE <<
- compound_order(compound_head(p))) {
+ compound_order(compound_head(page))) {
int ret;
- ret = get_user_pages_fast(start, 1, 0, &p);
+ ret = get_user_pages_fast(start, 1, 0, &page);
if (ret != 1)
return ret;
- if (PageHWPoison(p)) {
- put_page(p);
+ if (PageHWPoison(page)) {
+ put_page(page);
continue;
}
- if (bhv == MADV_SOFT_OFFLINE) {
- pr_info("Soft offlining page %#lx at %#lx\n",
- page_to_pfn(p), start);
- ret = soft_offline_page(p, MF_COUNT_INCREASED);
+
+ if (behavior == MADV_SOFT_OFFLINE) {
+ pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n",
+ page_to_pfn(page), start);
+
+ ret = soft_offline_page(page, MF_COUNT_INCREASED);
if (ret)
return ret;
continue;
}
- pr_info("Injecting memory failure for page %#lx at %#lx\n",
- page_to_pfn(p), start);
- ret = memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED);
+ pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
+ page_to_pfn(page), start);
+
+ ret = memory_failure(page_to_pfn(page), 0, MF_COUNT_INCREASED);
if (ret)
return ret;
}
@@ -763,7 +769,7 @@ static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
#ifdef CONFIG_MEMORY_FAILURE
if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
- return madvise_hwpoison(behavior, start, start+len_in);
+ return madvise_inject_error(behavior, start, start + len_in);
#endif
if (!madvise_behavior_valid(behavior))
return error;
--
1.8.5.2
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