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From: Matthew Wilcox <willy@infradead.org>
To: Qian Cai <cai@redhat.com>
Cc: linux-mm@kvack.org, intel-gfx@lists.freedesktop.org,
	Huang Ying <ying.huang@intel.com>,
	Hugh Dickins <hughd@google.com>,
	linux-kernel@vger.kernel.org,
	Chris Wilson <chris@chris-wilson.co.uk>,
	William Kucharski <william.kucharski@oracle.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	cgroups@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Matthew Auld <matthew.auld@intel.com>
Subject: Re: [PATCH v2 3/8] mm: Optimise madvise WILLNEED
Date: Mon, 14 Sep 2020 17:50:32 +0100
Message-ID: <20200914165032.GS6583@casper.infradead.org> (raw)
In-Reply-To: <c48c5eaa09d1ea5b78b12b545c034d1e937c49ba.camel@redhat.com>

On Mon, Sep 14, 2020 at 12:17:07PM -0400, Qian Cai wrote:
> Reverting the "Return head pages from find_*_entry" patchset [1] up to this
> patch fixed the issue that LTP madvise06 test [2] would trigger endless soft-
> lockups below. It does not help after applied patches fixed other separate
> issues in the patchset [3][4].

Thanks for the report.  Could you try this?

diff --git a/mm/madvise.c b/mm/madvise.c
index 96189acd6969..2d9ceccb338d 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -234,6 +234,7 @@ static void force_shm_swapin_readahead(struct vm_area_struct *vma,
 
 		if (!xa_is_value(page))
 			continue;
+		xas_pause(&xas);
 		rcu_read_unlock();
 
 		swap = radix_to_swp_entry(page);
@@ -243,7 +244,6 @@ static void force_shm_swapin_readahead(struct vm_area_struct *vma,
 			put_page(page);
 
 		rcu_read_lock();
-		xas_reset(&xas);
 	}
 	rcu_read_unlock();
 


  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10 18:33 [PATCH v2 0/8] Return head pages from find_*_entry Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 1/8] mm: Factor find_get_incore_page out of mincore_page Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 2/8] mm: Use find_get_incore_page in memcontrol Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 3/8] mm: Optimise madvise WILLNEED Matthew Wilcox (Oracle)
2020-09-14 16:17   ` Qian Cai
2020-09-14 16:47     ` Qian Cai
2020-09-14 16:50     ` Matthew Wilcox [this message]
2020-09-14 19:44       ` Qian Cai
2020-09-10 18:33 ` [PATCH v2 4/8] proc: Optimise smaps for shmem entries Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 5/8] i915: Use find_lock_page instead of find_lock_entry Matthew Wilcox (Oracle)
2020-09-10 18:33 ` [PATCH v2 6/8] mm: Convert find_get_entry to return the head page Matthew Wilcox (Oracle)
2020-09-14  8:55   ` [mm] 2037ab69a5: BUG:KASAN:null-ptr-deref_in_t kernel test robot
2020-09-14 11:27     ` Matthew Wilcox
2020-09-10 18:33 ` [PATCH v2 7/8] mm/shmem: Return head page from find_lock_entry Matthew Wilcox (Oracle)
2020-09-12  3:20   ` Matthew Wilcox
2020-09-10 18:33 ` [PATCH v2 8/8] mm: Add find_lock_head Matthew Wilcox (Oracle)
2020-09-15  8:10 ` [PATCH v2 0/8] Return head pages from find_*_entry Hugh Dickins
2020-09-15 12:53   ` Naresh Kamboju
2020-09-15 13:08     ` Matthew Wilcox

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