From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH 4/9] readahead: tag mmap page fault call sites Date: Tue, 29 Nov 2011 15:41:19 +0100 Message-ID: <20111129144119.GL5635@quack.suse.cz> References: <20111129130900.628549879@intel.com> <20111129131456.405886521@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andrew Morton , Andi Kleen , Linux Memory Management List , linux-fsdevel@vger.kernel.org, LKML To: Wu Fengguang Return-path: Content-Disposition: inline In-Reply-To: <20111129131456.405886521@intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Tue 29-11-11 21:09:04, Wu Fengguang wrote: > Introduce a bit field ra->for_mmap for tagging mmap reads. > The tag will be cleared immediate after submitting the IO. > > Signed-off-by: Wu Fengguang Looks OK. Acked-by: Jan Kara Honza > --- > include/linux/fs.h | 1 + > mm/filemap.c | 6 +++++- > mm/readahead.c | 1 + > 3 files changed, 7 insertions(+), 1 deletion(-) > > --- linux-next.orig/include/linux/fs.h 2011-11-29 10:12:19.000000000 +0800 > +++ linux-next/include/linux/fs.h 2011-11-29 10:13:08.000000000 +0800 > @@ -947,6 +947,7 @@ struct file_ra_state { > unsigned int ra_pages; /* Maximum readahead window */ > u16 mmap_miss; /* Cache miss stat for mmap accesses */ > u8 pattern; /* one of RA_PATTERN_* */ > + unsigned int for_mmap:1; /* readahead for mmap accesses */ > > loff_t prev_pos; /* Cache last read() position */ > }; > --- linux-next.orig/mm/filemap.c 2011-11-29 09:48:49.000000000 +0800 > +++ linux-next/mm/filemap.c 2011-11-29 10:13:08.000000000 +0800 > @@ -1592,6 +1592,7 @@ static void do_sync_mmap_readahead(struc > return; > > if (VM_SequentialReadHint(vma)) { > + ra->for_mmap = 1; > page_cache_sync_readahead(mapping, ra, file, offset, > ra->ra_pages); > return; > @@ -1611,6 +1612,7 @@ static void do_sync_mmap_readahead(struc > /* > * mmap read-around > */ > + ra->for_mmap = 1; > ra->pattern = RA_PATTERN_MMAP_AROUND; > ra_pages = max_sane_readahead(ra->ra_pages); > ra->start = max_t(long, 0, offset - ra_pages / 2); > @@ -1636,9 +1638,11 @@ static void do_async_mmap_readahead(stru > return; > if (ra->mmap_miss > 0) > ra->mmap_miss--; > - if (PageReadahead(page)) > + if (PageReadahead(page)) { > + ra->for_mmap = 1; > page_cache_async_readahead(mapping, ra, file, > page, offset, ra->ra_pages); > + } > } > > /** > --- linux-next.orig/mm/readahead.c 2011-11-29 09:48:49.000000000 +0800 > +++ linux-next/mm/readahead.c 2011-11-29 10:13:08.000000000 +0800 > @@ -267,6 +267,7 @@ unsigned long ra_submit(struct file_ra_s > actual = __do_page_cache_readahead(mapping, filp, > ra->start, ra->size, ra->async_size); > > + ra->for_mmap = 0; > return actual; > } > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Jan Kara SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org