From: Bob Peterson Date: Thu, 20 Aug 2020 13:59:28 +0000 (-0500) Subject: gfs2: enhance log_blocks trace point to show log blocks free X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=97c5e43d51a44bffdc0eb3c4b40c8d2d4cbe1a73;p=linux.git gfs2: enhance log_blocks trace point to show log blocks free This patch adds some code to enhance the log_blocks trace point. It reports the number of free log blocks. This makes the trace point much more useful, especially for debugging performance problems when we can tell when the journal gets full and needs to wait for flushes, etc. Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher --- diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h index e0025258107a8..fe140ceef74de 100644 --- a/fs/gfs2/trace_gfs2.h +++ b/fs/gfs2/trace_gfs2.h @@ -388,15 +388,17 @@ TRACE_EVENT(gfs2_log_blocks, TP_STRUCT__entry( __field( dev_t, dev ) __field( int, blocks ) + __field( int, blks_free ) ), TP_fast_assign( __entry->dev = sdp->sd_vfs->s_dev; __entry->blocks = blocks; + __entry->blks_free = atomic_read(&sdp->sd_log_blks_free); ), - TP_printk("%u,%u log reserve %d", MAJOR(__entry->dev), - MINOR(__entry->dev), __entry->blocks) + TP_printk("%u,%u log reserve %d %d", MAJOR(__entry->dev), + MINOR(__entry->dev), __entry->blocks, __entry->blks_free) ); /* Writing back the AIL */