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[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>
This commit is contained in:
Lachlan McIlroy 2008-09-17 16:45:37 +10:00 committed by Lachlan McIlroy
parent bc45eb8950
commit 31bd61f2bb
2 changed files with 40 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
fs/xfs/xfs_log.c
View File

@ -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 */

1
fs/xfs/xfs_log_priv.h
View File

@ -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