Messages in this thread | | | Date | Tue, 1 Sep 2020 17:48:27 +0100 | From | Matthew Wilcox <> | Subject | Re: [RFC PATCH 0/7] mm: Make more use of readahead_control |
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On Tue, Sep 01, 2020 at 05:28:15PM +0100, David Howells wrote: > Here's a set of patches to expand the use of the readahead_control struct, > essentially from do_sync_mmap_readahead() down.
I like this.
> Note that I've been > passing the number of pages to read in rac->_nr_pages, and then saving it > and changing it certain points, e.g. page_cache_readahead_unbounded().
I do not like this. You're essentially mutating the meaning of _nr_pages as the ractl moves down the stack, and that's going to lead to bugs. I'd keep it as a separate argument.
> Also there's an apparent minor bug in khugepaged.c that I've included a > patch for: page_cache_sync_readahead() looks to be given the wrong size in > collapse_file().
This needs to go in as an independent fix. But you didn't actually cc Song.
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