lkml.org 
[lkml]   [2018]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[POC 08/12] fs/dcache.c: access dentry_cache via rai_load
    Date
    This avoids a cacheline access to get the value of the dentry_cache
    pointer in the places that do a kmem_cache_*(dentry_cache, ...);

    Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
    ---
    fs/dcache.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    diff --git a/fs/dcache.c b/fs/dcache.c
    index 2e7e8d85e9b4..1d54dfb38c9d 100644
    --- a/fs/dcache.c
    +++ b/fs/dcache.c
    @@ -30,6 +30,7 @@
    #include <linux/bit_spinlock.h>
    #include <linux/rculist_bl.h>
    #include <linux/list_lru.h>
    +#include <linux/rai.h>
    #include "internal.h"
    #include "mount.h"

    @@ -76,7 +77,8 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock);

    EXPORT_SYMBOL(rename_lock);

    -static struct kmem_cache *dentry_cache __read_mostly;
    +static struct kmem_cache *__dentry_cache __read_mostly;
    +#define dentry_cache rai_load(__dentry_cache)

    const struct qstr empty_name = QSTR_INIT("", 0);
    EXPORT_SYMBOL(empty_name);
    @@ -3088,7 +3090,7 @@ static void __init dcache_init(void)
    * but it is probably not worth it because of the cache nature
    * of the dcache.
    */
    - dentry_cache = KMEM_CACHE_USERCOPY(dentry,
    + __dentry_cache = KMEM_CACHE_USERCOPY(dentry,
    SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
    d_iname);

    --
    2.19.1.6.gbde171bbf5
    \
     
     \ /
      Last update: 2018-10-18 00:35    [W:2.344 / U:0.304 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site