From: Yang Shi Date: Thu, 1 Feb 2018 00:18:28 +0000 (-0800) Subject: mm: thp: use down_read_trylock() in khugepaged to avoid long block X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=3b454ad35043dfbd3b5d2bb92b0991d6342afb44;p=openwrt%2Fstaging%2Fblogic.git mm: thp: use down_read_trylock() in khugepaged to avoid long block In the current design, khugepaged needs to acquire mmap_sem before scanning an mm. But in some corner cases, khugepaged may scan a process which is modifying its memory mapping, so khugepaged blocks in uninterruptible state. But the process might hold the mmap_sem for a long time when modifying a huge memory space and it may trigger the below khugepaged hung issue: INFO: task khugepaged:270 blocked for more than 120 seconds. Tainted: G E 4.9.65-006.ali3000.alios7.x86_64 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. khugepaged D 0 270 2 0x00000000  ffff883f3deae4c0 0000000000000000 ffff883f610596c0 ffff883f7d359440 ffff883f63818000 ffffc90019adfc78 ffffffff817079a5 d67e5aa8c1860a64 0000000000000246 ffff883f7d359440 ffffc90019adfc88 ffff883f610596c0 Call Trace: schedule+0x36/0x80 rwsem_down_read_failed+0xf0/0x150 call_rwsem_down_read_failed+0x18/0x30 down_read+0x20/0x40 khugepaged+0x476/0x11d0 kthread+0xe6/0x100 ret_from_fork+0x25/0x30 So it sounds pointless to just block khugepaged waiting for the semaphore so replace down_read() with down_read_trylock() to move to scan the next mm quickly instead of just blocking on the semaphore so that other processes can get more chances to install THP. Then khugepaged can come back to scan the skipped mm when it has finished the current round full_scan. And it appears that the change can improve khugepaged efficiency a little bit. Below is the test result when running LTP on a 24 cores 4GB memory 2 nodes NUMA VM: pristine w/ trylock full_scan 197 187 pages_collapsed 21 26 thp_fault_alloc 40818 44466 thp_fault_fallback 18413 16679 thp_collapse_alloc 21 150 thp_collapse_alloc_failed 14 16 thp_file_alloc 369 369 [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: tweak comment] [arnd@arndb.de: avoid uninitialized variable use] Link: http://lkml.kernel.org/r/20171215125129.2948634-1-arnd@arndb.de Link: http://lkml.kernel.org/r/1513281203-54878-1-git-send-email-yang.s@alibaba-inc.com Signed-off-by: Yang Shi Acked-by: Kirill A. Shutemov Acked-by: Michal Hocko Cc: Hugh Dickins Cc: Andrea Arcangeli Signed-off-by: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 1cd18e4347fe..b7e2268dfc9a 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1673,10 +1673,14 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, spin_unlock(&khugepaged_mm_lock); mm = mm_slot->mm; - down_read(&mm->mmap_sem); - if (unlikely(khugepaged_test_exit(mm))) - vma = NULL; - else + /* + * Don't wait for semaphore (to avoid long wait times). Just move to + * the next mm on the list. + */ + vma = NULL; + if (unlikely(!down_read_trylock(&mm->mmap_sem))) + goto breakouterloop_mmap_sem; + if (likely(!khugepaged_test_exit(mm))) vma = find_vma(mm, khugepaged_scan.address); progress++;