linux-kernel - Re: [PATCH v2 0/8] mm/swap: Regular page swap optimizations

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Date:   Fri, 21 Oct 2016 10:40:20 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ying Huang <ying.huang@...el.com>, dave.hansen@...el.com,
        ak@...ux.intel.com, aaron.lu@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
        Shaohua Li <shli@...nel.org>, Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>
Subject: Re: [PATCH v2 0/8] mm/swap: Regular page swap optimizations

On Fri, Oct 21, 2016 at 12:05:19PM +0200, Christian Borntraeger wrote:
> On 10/21/2016 10:16 AM, Christian Borntraeger wrote:
> > [  308.206297] Call Trace:
> > [  308.206299] ([<000000000025d3ec>] __alloc_pages_nodemask+0x134/0xdf8)
> > [  308.206303] ([<0000000000280d6a>] kmalloc_order+0x42/0x70)
> > [  308.206305] ([<0000000000280dd8>] kmalloc_order_trace+0x40/0xf0)
> > [  308.206310] ([<00000000002a7090>] init_swap_address_space+0x68/0x138)
> > [  308.206312] ([<00000000002ac858>] SyS_swapon+0xbd0/0xf80)
> > [  308.206317] ([<0000000000785476>] system_call+0xd6/0x264)
> > [  308.206318] Last Breaking-Event-Address:
> > [  308.206319]  [<000000000025db38>] __alloc_pages_nodemask+0x880/0xdf8
> > [  308.206320] ---[ end trace aaeca736f47ac05b ]---
> > 
> 
> Looks like that 1TB of swap is just too big for your logic (you try kmalloc without checking the size).
> 

Thanks for giving this patch series a spin.
Let's use vzalloc instead.  Can you try the following change.

Thanks.

Tim

--->8---
diff --git a/mm/swap_state.c b/mm/swap_state.c
index af4ed5f..0f84526 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -526,11 +526,9 @@ int init_swap_address_space(unsigned int type, unsigned long nr_pages)
 	unsigned int i, nr;
 
 	nr = DIV_ROUND_UP(nr_pages, SWAP_ADDRESS_SPACE_PAGES);
-	spaces = kzalloc(sizeof(struct address_space) * nr, GFP_KERNEL);
+	spaces = vzalloc(sizeof(struct address_space) * nr);
 	if (!spaces) {
-		spaces = vzalloc(sizeof(struct address_space) * nr);
-		if (!spaces)
-			return -ENOMEM;
+		return -ENOMEM;
 	}
 	for (i = 0; i < nr; i++) {
 		space = spaces + i;