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authorMilosz Tanski <milosz@adfin.com>2014-08-13 12:58:16 -0400
committerDavid Howells <dhowells@redhat.com>2014-08-27 15:24:06 +0100
commit9776de96e51565286da25c74d6f631abc50c63ef (patch)
tree11155ad14b6b1b8942f4d3f49be2d50ecfc1be2c /fs/fscache
parent68e370289c29e3beac99d59c6d840d470af9dfcf (diff)
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FS-Cache: Timeout for releasepage()
This is meant to avoid a recusive hang caused by underlying filesystem trying to grab a free page and causing a write-out. INFO: task kworker/u30:7:28375 blocked for more than 120 seconds. Not tainted 3.15.0-virtual #74 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u30:7 D 0000000000000000 0 28375 2 0x00000000 Workqueue: fscache_operation fscache_op_work_func [fscache] ffff88000b147148 0000000000000046 0000000000000000 ffff88000b1471c8 ffff8807aa031820 0000000000014040 ffff88000b147fd8 0000000000014040 ffff880f0c50c860 ffff8807aa031820 ffff88000b147158 ffff88007be59cd0 Call Trace: [<ffffffff815930e9>] schedule+0x29/0x70 [<ffffffffa018bed5>] __fscache_wait_on_page_write+0x55/0x90 [fscache] [<ffffffff810a4350>] ? __wake_up_sync+0x20/0x20 [<ffffffffa018c135>] __fscache_maybe_release_page+0x65/0x1e0 [fscache] [<ffffffffa02ad813>] ceph_releasepage+0x83/0x100 [ceph] [<ffffffff811635b0>] ? anon_vma_fork+0x130/0x130 [<ffffffff8112cdd2>] try_to_release_page+0x32/0x50 [<ffffffff81140096>] shrink_page_list+0x7e6/0x9d0 [<ffffffff8113f278>] ? isolate_lru_pages.isra.73+0x78/0x1e0 [<ffffffff81140932>] shrink_inactive_list+0x252/0x4c0 [<ffffffff811412b1>] shrink_lruvec+0x3e1/0x670 [<ffffffff8114157f>] shrink_zone+0x3f/0x110 [<ffffffff81141b06>] do_try_to_free_pages+0x1d6/0x450 [<ffffffff8114a939>] ? zone_statistics+0x99/0xc0 [<ffffffff81141e44>] try_to_free_pages+0xc4/0x180 [<ffffffff81136982>] __alloc_pages_nodemask+0x6b2/0xa60 [<ffffffff811c1d4e>] ? __find_get_block+0xbe/0x250 [<ffffffff810a405e>] ? wake_up_bit+0x2e/0x40 [<ffffffff811740c3>] alloc_pages_current+0xb3/0x180 [<ffffffff8112cf07>] __page_cache_alloc+0xb7/0xd0 [<ffffffff8112da6c>] grab_cache_page_write_begin+0x7c/0xe0 [<ffffffff81214072>] ? ext4_mark_inode_dirty+0x82/0x220 [<ffffffff81214a89>] ext4_da_write_begin+0x89/0x2d0 [<ffffffff8112c6ee>] generic_perform_write+0xbe/0x1d0 [<ffffffff811a96b1>] ? update_time+0x81/0xc0 [<ffffffff811ad4c2>] ? mnt_clone_write+0x12/0x30 [<ffffffff8112e80e>] __generic_file_aio_write+0x1ce/0x3f0 [<ffffffff8112ea8e>] generic_file_aio_write+0x5e/0xe0 [<ffffffff8120b94f>] ext4_file_write+0x9f/0x410 [<ffffffff8120af56>] ? ext4_file_open+0x66/0x180 [<ffffffff8118f0da>] do_sync_write+0x5a/0x90 [<ffffffffa025c6c9>] cachefiles_write_page+0x149/0x430 [cachefiles] [<ffffffff812cf439>] ? radix_tree_gang_lookup_tag+0x89/0xd0 [<ffffffffa018c512>] fscache_write_op+0x222/0x3b0 [fscache] [<ffffffffa018b35a>] fscache_op_work_func+0x3a/0x100 [fscache] [<ffffffff8107bfe9>] process_one_work+0x179/0x4a0 [<ffffffff8107d47b>] worker_thread+0x11b/0x370 [<ffffffff8107d360>] ? manage_workers.isra.21+0x2e0/0x2e0 [<ffffffff81083d69>] kthread+0xc9/0xe0 [<ffffffff81010000>] ? ftrace_raw_event_xen_mmu_release_ptpage+0x70/0x90 [<ffffffff81083ca0>] ? flush_kthread_worker+0xb0/0xb0 [<ffffffff8159eefc>] ret_from_fork+0x7c/0xb0 [<ffffffff81083ca0>] ? flush_kthread_worker+0xb0/0xb0 Signed-off-by: Milosz Tanski <milosz@adfin.com> Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/fscache')
-rw-r--r--fs/fscache/page.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 85332b9d19d1..781ac7b0b53e 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -44,6 +44,19 @@ void __fscache_wait_on_page_write(struct fscache_cookie *cookie, struct page *pa
EXPORT_SYMBOL(__fscache_wait_on_page_write);
/*
+ * wait for a page to finish being written to the cache. Put a timeout here
+ * since we might be called recursively via parent fs.
+ */
+static
+bool release_page_wait_timeout(struct fscache_cookie *cookie, struct page *page)
+{
+ wait_queue_head_t *wq = bit_waitqueue(&cookie->flags, 0);
+
+ return wait_event_timeout(*wq, !__fscache_check_page_write(cookie, page),
+ HZ);
+}
+
+/*
* decide whether a page can be released, possibly by cancelling a store to it
* - we're allowed to sleep if __GFP_WAIT is flagged
*/
@@ -115,7 +128,10 @@ page_busy:
}
fscache_stat(&fscache_n_store_vmscan_wait);
- __fscache_wait_on_page_write(cookie, page);
+ if (!release_page_wait_timeout(cookie, page))
+ _debug("fscache writeout timeout page: %p{%lx}",
+ page, page->index);
+
gfp &= ~__GFP_WAIT;
goto try_again;
}