xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gfs2: Replace gl_revokes with a GLF flag

Browse Source 
The gl_revokes value determines how many outstanding revokes a glock has
on the superblock revokes list; this is used to avoid unnecessary log
flushes.  However, gl_revokes is only ever tested for being zero, and it's
only decremented in revoke_lo_after_commit, which removes all revokes
from the list, so we know that the gl_revoke values of all the glocks on
the list will reach zero.  Therefore, we can replace gl_revokes with a
bit flag. This saves an atomic counter in struct gfs2_glock.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson
2019-04-05 04:41:38 +01:00
committed by Andreas Gruenbacher
parent 9287c6452d
commit 73118ca8ba
6 changed files with 31 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/gfs2/log.c
View File

@@ -606,8 +606,10 @@ void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
gfs2_remove_from_ail(bd); /* drops ref on bh */
bd->bd_bh = NULL;
sdp->sd_log_num_revoke++;
if (atomic_inc_return(&gl->gl_revokes) == 1)
if (!test_bit(GLF_REVOKES, &gl->gl_flags)) {
set_bit(GLF_REVOKES, &gl->gl_flags);
gfs2_glock_hold(gl);
}
set_bit(GLF_LFLUSH, &gl->gl_flags);
list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
}