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Fix zfs_txg_timeout module parameter

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Allow the zfs_txg_timeout variable to be dynamically tuned at run
time.  By pulling it down out of the variable declaration it will
be evaluted each time through the loop.

The zfs_txg_timeout variable is now declared extern in a the common
sys/txg.h header rather than locally in dsl_scan.c.  This prevents
potential type mismatches if the global variable needs to be used
elsewhere.

Move the module_param() code in to the same source file where
zfs_txg_timeout is declared.  This is the most logical location.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2012-10-11 13:56:32 -07:00
parent 7df05a4266
commit 87d98efe9e
3 changed files with 9 additions and 6 deletions
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3
include/sys/txg.h
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@ -130,6 +130,9 @@ extern int txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
/* Global tuning */
extern int zfs_txg_timeout;
#ifdef __cplusplus
}
#endif

5
module/zfs/dsl_scan.c
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@ -71,8 +71,6 @@ int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */
((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
(scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
extern int zfs_txg_timeout;
/* the order has to match pool_scan_type */
static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = {
NULL,
@ -1813,7 +1811,4 @@ MODULE_PARM_DESC(zfs_no_scrub_io, "Set to disable scrub I/O");
module_param(zfs_no_scrub_prefetch, int, 0644);
MODULE_PARM_DESC(zfs_no_scrub_prefetch, "Set to disable scrub prefetching");
module_param(zfs_txg_timeout, int, 0644);
MODULE_PARM_DESC(zfs_txg_timeout, "Max seconds worth of delta per txg");
#endif

7
module/zfs/txg.c
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@ -395,9 +395,11 @@ txg_sync_thread(dsl_pool_t *dp)
start = delta = 0;
for (;;) {
uint64_t timer, timeout = zfs_txg_timeout * hz;
uint64_t timer, timeout;
uint64_t txg;
timeout = zfs_txg_timeout * hz;
/*
* We sync when we're scanning, there's someone waiting
* on us, or the quiesce thread has handed off a txg to
@ -773,4 +775,7 @@ EXPORT_SYMBOL(txg_wait_open);
EXPORT_SYMBOL(txg_wait_callbacks);
EXPORT_SYMBOL(txg_stalled);
EXPORT_SYMBOL(txg_sync_waiting);
module_param(zfs_txg_timeout, int, 0644);
MODULE_PARM_DESC(zfs_txg_timeout, "Max seconds worth of delta per txg");
#endif