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Commit6638380

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Matthew Wilcox (Oracle)torvalds
Matthew Wilcox (Oracle)
authored andcommitted
mm: fix madvise WILLNEED performance problem
The calculation of the end page index was incorrect, leading to aregression of 70% when running stress-ng.With this fix, we instead see a performance improvement of 3%.Fixes:e6e8871 ("mm: optimise madvise WILLNEED")Reported-by: kernel test robot <rong.a.chen@intel.com>Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Tested-by: Xing Zhengjun <zhengjun.xing@linux.intel.com>Acked-by: Johannes Weiner <hannes@cmpxchg.org>Cc: William Kucharski <william.kucharski@oracle.com>Cc: Feng Tang <feng.tang@intel.com>Cc: "Chen, Rong A" <rong.a.chen@intel.com>Link:https://lkml.kernel.org/r/20201109134851.29692-1-willy@infradead.orgSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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‎mm/madvise.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -226,7 +226,7 @@ static void force_shm_swapin_readahead(struct vm_area_struct *vma,
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structaddress_space*mapping)
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{
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XA_STATE(xas,&mapping->i_pages,linear_page_index(vma,start));
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pgoff_tend_index=end/PAGE_SIZE;
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pgoff_tend_index=linear_page_index(vma,end+PAGE_SIZE-1);
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structpage*page;
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rcu_read_lock();

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