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Commit 972b044e authored by Andreas Gruenbacher's avatar Andreas Gruenbacher Committed by Bob Peterson
Browse files

gfs2: Don't pack struct lm_lockname 



As per a suggestion by Linus, don't pack struct lm_lockname: we did that
because the struct is used as a rhashtable key, but packing tells the
compiler that the 64-bit fields in the struct may be unaligned, causing
it to generate worse code on some architectures.  Instead, rearrange the
fields in the struct so that there is no padding between fields, and
exclude any tail padding from the hash key size.

Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
parent 92ecd73a

fs/gfs2/glock.c

+1 −1
Original line number Diff line number Diff line
@@ -73,7 +73,7 @@ static DEFINE_SPINLOCK(lru_lock); 


static struct rhashtable_params ht_parms = {

	.nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4,

	.key_len = sizeof(struct lm_lockname),

	.key_len = offsetofend(struct lm_lockname, ln_type),

	.key_offset = offsetof(struct gfs2_glock, gl_name),

	.head_offset = offsetof(struct gfs2_glock, gl_node),

};

fs/gfs2/incore.h

+6 −2
Original line number Diff line number Diff line
@@ -203,11 +203,15 @@ enum { 
	DFL_DLM_RECOVERY	= 6,

};



/*

 * We are using struct lm_lockname as an rhashtable key.  Avoid holes within

 * the struct; padding at the end is fine.

 */

struct lm_lockname {

	struct gfs2_sbd *ln_sbd;

	u64 ln_number;

	struct gfs2_sbd *ln_sbd;

	unsigned int ln_type;

} __packed __aligned(sizeof(int));

};



#define lm_name_equal(name1, name2) \

        (((name1)->ln_number == (name2)->ln_number) &&	\