[XFS] Move memory allocations for log tracing out of the critical path

Memory allocations for log->l_grant_trace and iclog->ic_trace are done on
demand when the first event is logged. In xlog_state_get_iclog_space() we
call xlog_trace_iclog() under a spinlock and allocating memory here can
cause us to sleep with a spinlock held and deadlock the system.

For the log grant tracing we use KM_NOSLEEP but that means we can lose
trace entries. Since there is no locking to serialize the log grant
tracing we could race and have multiple allocations and leak memory.

So move the allocations to where we initialize the log/iclog structures.
Use KM_NOFS to avoid recursing into the filesystem and drop log->l_trace
since it's not even used.

SGI-PV: 983738

SGI-Modid: xfs-linux-melb:xfs-kern:31896a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index ccba14eb9dbe373699417a2984eb559854bf5dbb..7812bd036e2b30fe3e5050cdff3b2281d53b464f 100644 (file)
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -124,16 +124,27 @@ STATIC void       xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
 STATIC int     xlog_iclogs_empty(xlog_t *log);
 
 #if defined(XFS_LOG_TRACE)
+
+#define XLOG_TRACE_LOGGRANT_SIZE       2048
+#define XLOG_TRACE_ICLOG_SIZE          256
+
+void
+xlog_trace_loggrant_alloc(xlog_t *log)
+{
+       log->l_grant_trace = ktrace_alloc(XLOG_TRACE_LOGGRANT_SIZE, KM_NOFS);
+}
+
+void
+xlog_trace_loggrant_dealloc(xlog_t *log)
+{
+       ktrace_free(log->l_grant_trace);
+}
+
 void
 xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
 {
        unsigned long cnts;
 
-       if (!log->l_grant_trace) {
-               log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP);
-               if (!log->l_grant_trace)
-                       return;
-       }
        /* ticket counts are 1 byte each */
        cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
 
@@ -156,11 +167,21 @@ xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
                     (void *)((unsigned long)tic->t_unit_res));
 }
 
+void
+xlog_trace_iclog_alloc(xlog_in_core_t *iclog)
+{
+       iclog->ic_trace = ktrace_alloc(XLOG_TRACE_ICLOG_SIZE, KM_NOFS);
+}
+
+void
+xlog_trace_iclog_dealloc(xlog_in_core_t *iclog)
+{
+       ktrace_free(iclog->ic_trace);
+}
+
 void
 xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
 {
-       if (!iclog->ic_trace)
-               iclog->ic_trace = ktrace_alloc(256, KM_NOFS);
        ktrace_enter(iclog->ic_trace,
                     (void *)((unsigned long)state),
                     (void *)((unsigned long)current_pid()),
@@ -170,8 +191,15 @@ xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
                     (void *)NULL, (void *)NULL);
 }
 #else
+
+#define        xlog_trace_loggrant_alloc(log)
+#define        xlog_trace_loggrant_dealloc(log)
 #define        xlog_trace_loggrant(log,tic,string)
+
+#define        xlog_trace_iclog_alloc(iclog)
+#define        xlog_trace_iclog_dealloc(iclog)
 #define        xlog_trace_iclog(iclog,state)
+
 #endif /* XFS_LOG_TRACE */
 
 
@@ -1231,6 +1259,7 @@ xlog_alloc_log(xfs_mount_t        *mp,
        spin_lock_init(&log->l_grant_lock);
        sv_init(&log->l_flush_wait, 0, "flush_wait");
 
+       xlog_trace_loggrant_alloc(log);
        /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
        ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
 
@@ -1285,6 +1314,8 @@ xlog_alloc_log(xfs_mount_t        *mp,
                sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force");
                sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write");
 
+               xlog_trace_iclog_alloc(iclog);
+
                iclogp = &iclog->ic_next;
        }
        *iclogp = log->l_iclog;                 /* complete ring */
@@ -1565,11 +1596,7 @@ xlog_dealloc_log(xlog_t *log)
                sv_destroy(&iclog->ic_force_wait);
                sv_destroy(&iclog->ic_write_wait);
                xfs_buf_free(iclog->ic_bp);
-#ifdef XFS_LOG_TRACE
-               if (iclog->ic_trace != NULL) {
-                       ktrace_free(iclog->ic_trace);
-               }
-#endif
+               xlog_trace_iclog_dealloc(iclog);
                next_iclog = iclog->ic_next;
                kmem_free(iclog);
                iclog = next_iclog;
@@ -1578,14 +1605,7 @@ xlog_dealloc_log(xlog_t *log)
        spinlock_destroy(&log->l_grant_lock);
 
        xfs_buf_free(log->l_xbuf);
-#ifdef XFS_LOG_TRACE
-       if (log->l_trace != NULL) {
-               ktrace_free(log->l_trace);
-       }
-       if (log->l_grant_trace != NULL) {
-               ktrace_free(log->l_grant_trace);
-       }
-#endif
+       xlog_trace_loggrant_dealloc(log);
        log->l_mp->m_log = NULL;
        kmem_free(log);
 }      /* xlog_dealloc_log */

diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index c8a5b22ee3e3b02fa1cd13e639bf2fe9b3f525a7..e7d8f84443fab87ceee83561fb6b1f04685400ff 100644 (file)
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -448,7 +448,6 @@ typedef struct log {
        int                     l_grant_write_bytes;
 
 #ifdef XFS_LOG_TRACE
-       struct ktrace           *l_trace;
        struct ktrace           *l_grant_trace;
 #endif