linux-kernel - Re: [PATCH v3 2/2] fadvise: implement POSIX_FADV

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Message-ID: <4E07B709.9010306@redhat.com>
Date:	Sun, 26 Jun 2011 18:47:37 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Righi <andrea@...terlinux.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Jerry James <jamesjer@...terlinux.com>,
	Marcus Sorensen <marcus@...ehost.com>,
	Matt Heaton <matt@...ehost.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Theodore Tso <tytso@....edu>,
	Shaohua Li <shaohua.li@...el.com>,
	Pádraig Brady <P@...igBrady.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] fadvise: implement POSIX_FADV_NOREUSE

On 06/24/2011 09:49 AM, Andrea Righi wrote:

> @@ -114,7 +114,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
>   			ret = 0;
>   		break;
>   	case POSIX_FADV_NOREUSE:
> -		break;
> +		/* Reduce cache eligibility */
> +		force = false;
>   	case POSIX_FADV_DONTNEED:
>   		if (!bdi_write_congested(mapping->backing_dev_info))
>   			filemap_flush(mapping);

And the same is true here.  "force" is just not a very
descriptive name.

> @@ -124,8 +125,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
>   		end_index = (endbyte>>  PAGE_CACHE_SHIFT);
>
>   		if (end_index>= start_index)
> -			invalidate_mapping_pages(mapping, start_index,
> -						end_index);
> +			__invalidate_mapping_pages(mapping, start_index,
> +						end_index, force);
>   		break;
>   	default:
>   		ret = -EINVAL;


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