Re: [PATCH v2] ext4: fix prefetchw of NULL page

2019-04-07 Thread Theodore Ts'o
On Sun, Mar 31, 2019 at 04:11:34PM +0800, Liu Xiang wrote: > In ext4_mpage_readpages(), if the parameter pages is not NULL, another > parameter page is NULL. At the first time prefetchw(&page->flags) > works on NULL. From second time, prefetchw(&page->flags) always works on > the last consumed page

[PATCH v2] ext4: fix prefetchw of NULL page

2019-03-31 Thread Liu Xiang
In ext4_mpage_readpages(), if the parameter pages is not NULL, another parameter page is NULL. At the first time prefetchw(&page->flags) works on NULL. From second time, prefetchw(&page->flags) always works on the last consumed page. This might do little improvment for handling current page. So pre