linux-kernel - Re: [PATCH] mm/vmscan: Remove sysctl_vfs_cache

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Date:	Mon, 11 Jul 2011 09:51:43 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	raghu.prabhu13@...il.com
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, keithp@...thp.com,
	viro@...iv.linux.org.uk, riel@...hat.com, swhiteho@...hat.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, jack@...e.cz,
	Raghavendra D Prabhu <rprabhu@...hang.net>
Subject: Re: [PATCH] mm/vmscan: Remove sysctl_vfs_cache_pressure from
 non-vfs shrinkers

On Mon, 11 Jul 2011 02:56:24 +0530
raghu.prabhu13@...il.com wrote:

> From: Raghavendra D Prabhu <rprabhu@...hang.net>
> 
> sysctl_vfs_cache_pressure is meant to only affect the dentries and inodes slab
> caches. However, it has been used shrinkers elsewhere to trim the number of
> slabs returned to shrink_slab. So, this patch removes it from those places.
> 
> Signed-off-by: Raghavendra D Prabhu <rprabhu@...hang.net>

Hmm, which is better to fix the code or to fix the Document ?

Thanks,
-Kame



> ---
>  drivers/gpu/drm/i915/i915_gem.c |    2 +-
>  fs/gfs2/glock.c                 |    2 +-
>  fs/gfs2/quota.c                 |    2 +-
>  fs/mbcache.c                    |    2 +-
>  fs/nfs/dir.c                    |    2 +-
>  fs/quota/dquot.c                |    3 +--
>  net/sunrpc/auth.c               |    2 +-
>  7 files changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 5c0d124..ca4f6b5 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4146,5 +4146,5 @@ rescan:
>  			goto rescan;
>  	}
>  	mutex_unlock(&dev->struct_mutex);
> -	return cnt / 100 * sysctl_vfs_cache_pressure;
> +	return cnt;
>  }
> diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
> index 1c1336e..68872ed 100644
> --- a/fs/gfs2/glock.c
> +++ b/fs/gfs2/glock.c
> @@ -1400,7 +1400,7 @@ static int gfs2_shrink_glock_memory(struct shrinker *shrink,
>  	atomic_add(nr_skipped, &lru_count);
>  	spin_unlock(&lru_lock);
>  out:
> -	return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure;
> +	return atomic_read(&lru_count);
>  }
>  
>  static struct shrinker glock_shrinker = {
> diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
> index 42e8d23..30ac1fa 100644
> --- a/fs/gfs2/quota.c
> +++ b/fs/gfs2/quota.c
> @@ -117,7 +117,7 @@ int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
>  	spin_unlock(&qd_lru_lock);
>  
>  out:
> -	return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
> +	return atomic_read(&qd_lru_count);
>  }
>  
>  static u64 qd2offset(struct gfs2_quota_data *qd)
> diff --git a/fs/mbcache.c b/fs/mbcache.c
> index 8c32ef3..2a51c51 100644
> --- a/fs/mbcache.c
> +++ b/fs/mbcache.c
> @@ -189,7 +189,7 @@ mb_cache_shrink_fn(struct shrinker *shrink, struct shrink_control *sc)
>  	list_for_each_entry_safe(entry, tmp, &free_list, e_lru_list) {
>  		__mb_cache_entry_forget(entry, gfp_mask);
>  	}
> -	return (count / 100) * sysctl_vfs_cache_pressure;
> +	return count;
>  }
>  
>  
> diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
> index ededdbd..700806e 100644
> --- a/fs/nfs/dir.c
> +++ b/fs/nfs/dir.c
> @@ -2077,7 +2077,7 @@ remove_lru_entry:
>  	}
>  	spin_unlock(&nfs_access_lru_lock);
>  	nfs_access_free_list(&head);
> -	return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure;
> +	return atomic_long_read(&nfs_access_nr_entries);
>  }
>  
>  static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
> index 5b572c8..97dd902 100644
> --- a/fs/quota/dquot.c
> +++ b/fs/quota/dquot.c
> @@ -702,8 +702,7 @@ static int shrink_dqcache_memory(struct shrinker *shrink,
>  		spin_unlock(&dq_list_lock);
>  	}
>  	return ((unsigned)
> -		percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
> -		/100) * sysctl_vfs_cache_pressure;
> +		percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]));
>  }
>  
>  static struct shrinker dqcache_shrinker = {
> diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
> index cd6e4aa..8f53697 100644
> --- a/net/sunrpc/auth.c
> +++ b/net/sunrpc/auth.c
> @@ -319,7 +319,7 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
>  		}
>  		spin_unlock(cache_lock);
>  	}
> -	return (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
> +	return number_cred_unused;
>  }
>  
>  /*
> -- 
> 1.7.6
> 
> 

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