[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>
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@ -124,16 +124,27 @@ STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
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STATIC int xlog_iclogs_empty(xlog_t *log);
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STATIC int xlog_iclogs_empty(xlog_t *log);
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#if defined(XFS_LOG_TRACE)
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#if defined(XFS_LOG_TRACE)
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#define XLOG_TRACE_LOGGRANT_SIZE 2048
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#define XLOG_TRACE_ICLOG_SIZE 256
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void
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xlog_trace_loggrant_alloc(xlog_t *log)
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{
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log->l_grant_trace = ktrace_alloc(XLOG_TRACE_LOGGRANT_SIZE, KM_NOFS);
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}
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void
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xlog_trace_loggrant_dealloc(xlog_t *log)
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{
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ktrace_free(log->l_grant_trace);
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}
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void
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void
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xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
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xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
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{
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{
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unsigned long cnts;
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unsigned long cnts;
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if (!log->l_grant_trace) {
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log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP);
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if (!log->l_grant_trace)
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return;
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}
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/* ticket counts are 1 byte each */
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/* ticket counts are 1 byte each */
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cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
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cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
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@ -156,11 +167,21 @@ xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
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(void *)((unsigned long)tic->t_unit_res));
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(void *)((unsigned long)tic->t_unit_res));
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}
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}
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void
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xlog_trace_iclog_alloc(xlog_in_core_t *iclog)
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{
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iclog->ic_trace = ktrace_alloc(XLOG_TRACE_ICLOG_SIZE, KM_NOFS);
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}
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void
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xlog_trace_iclog_dealloc(xlog_in_core_t *iclog)
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{
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ktrace_free(iclog->ic_trace);
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}
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void
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void
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xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
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xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
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{
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{
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if (!iclog->ic_trace)
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iclog->ic_trace = ktrace_alloc(256, KM_NOFS);
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ktrace_enter(iclog->ic_trace,
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ktrace_enter(iclog->ic_trace,
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(void *)((unsigned long)state),
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(void *)((unsigned long)state),
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(void *)((unsigned long)current_pid()),
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(void *)((unsigned long)current_pid()),
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@ -170,8 +191,15 @@ xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
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(void *)NULL, (void *)NULL);
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(void *)NULL, (void *)NULL);
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}
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}
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#else
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#else
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#define xlog_trace_loggrant_alloc(log)
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#define xlog_trace_loggrant_dealloc(log)
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#define xlog_trace_loggrant(log,tic,string)
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#define xlog_trace_loggrant(log,tic,string)
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#define xlog_trace_iclog_alloc(iclog)
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#define xlog_trace_iclog_dealloc(iclog)
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#define xlog_trace_iclog(iclog,state)
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#define xlog_trace_iclog(iclog,state)
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#endif /* XFS_LOG_TRACE */
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#endif /* XFS_LOG_TRACE */
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@ -1231,6 +1259,7 @@ xlog_alloc_log(xfs_mount_t *mp,
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spin_lock_init(&log->l_grant_lock);
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spin_lock_init(&log->l_grant_lock);
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sv_init(&log->l_flush_wait, 0, "flush_wait");
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sv_init(&log->l_flush_wait, 0, "flush_wait");
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xlog_trace_loggrant_alloc(log);
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/* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
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/* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
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ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
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ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
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@ -1285,6 +1314,8 @@ xlog_alloc_log(xfs_mount_t *mp,
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sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force");
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sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force");
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sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write");
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sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write");
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xlog_trace_iclog_alloc(iclog);
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iclogp = &iclog->ic_next;
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iclogp = &iclog->ic_next;
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}
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}
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*iclogp = log->l_iclog; /* complete ring */
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*iclogp = log->l_iclog; /* complete ring */
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@ -1565,11 +1596,7 @@ xlog_dealloc_log(xlog_t *log)
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sv_destroy(&iclog->ic_force_wait);
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sv_destroy(&iclog->ic_force_wait);
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sv_destroy(&iclog->ic_write_wait);
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sv_destroy(&iclog->ic_write_wait);
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xfs_buf_free(iclog->ic_bp);
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xfs_buf_free(iclog->ic_bp);
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#ifdef XFS_LOG_TRACE
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xlog_trace_iclog_dealloc(iclog);
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if (iclog->ic_trace != NULL) {
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ktrace_free(iclog->ic_trace);
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}
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#endif
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next_iclog = iclog->ic_next;
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next_iclog = iclog->ic_next;
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kmem_free(iclog);
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kmem_free(iclog);
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iclog = next_iclog;
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iclog = next_iclog;
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@ -1578,14 +1605,7 @@ xlog_dealloc_log(xlog_t *log)
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spinlock_destroy(&log->l_grant_lock);
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spinlock_destroy(&log->l_grant_lock);
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xfs_buf_free(log->l_xbuf);
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xfs_buf_free(log->l_xbuf);
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#ifdef XFS_LOG_TRACE
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xlog_trace_loggrant_dealloc(log);
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if (log->l_trace != NULL) {
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ktrace_free(log->l_trace);
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}
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if (log->l_grant_trace != NULL) {
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ktrace_free(log->l_grant_trace);
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}
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#endif
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log->l_mp->m_log = NULL;
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log->l_mp->m_log = NULL;
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kmem_free(log);
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kmem_free(log);
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} /* xlog_dealloc_log */
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} /* xlog_dealloc_log */
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@ -448,7 +448,6 @@ typedef struct log {
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int l_grant_write_bytes;
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int l_grant_write_bytes;
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#ifdef XFS_LOG_TRACE
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#ifdef XFS_LOG_TRACE
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struct ktrace *l_trace;
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struct ktrace *l_grant_trace;
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struct ktrace *l_grant_trace;
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#endif
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#endif
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