From: Johann Lombardi <johann.lomba...@intel.com> Use at_max in osc_enter_cache() to bound how long we wait for grant space before switching to synchronous I/Os. Do not print a message on the console when the timeout is hit since such long wait can be legitimate with flaky network (i.e. BRW is resent multiple times).
Signed-off-by: Johann Lombardi <johann.lomba...@intel.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5521 Reviewed-on: http://review.whamcloud.com/12146 Reviewed-by: Niu Yawei <yawei....@intel.com> Reviewed-by: Jinshan Xiong <jinshan.xi...@intel.com> Reviewed-by: Oleg Drokin <oleg.dro...@intel.com> Signed-off-by: James Simmons <jsimm...@infradead.org> --- drivers/staging/lustre/lustre/osc/osc_cache.c | 61 ++++++++++++++++--------- 1 files changed, 40 insertions(+), 21 deletions(-) diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c index 8152cc7..6b7677f 100644 --- a/drivers/staging/lustre/lustre/osc/osc_cache.c +++ b/drivers/staging/lustre/lustre/osc/osc_cache.c @@ -1536,7 +1536,7 @@ static int osc_enter_cache_try(struct client_obd *cli, { int rc; - OSC_DUMP_GRANT(D_CACHE, cli, "need:%d.\n", bytes); + OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes); rc = osc_reserve_grant(cli, bytes); if (rc < 0) @@ -1581,11 +1581,13 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli, struct osc_object *osc = oap->oap_obj; struct lov_oinfo *loi = osc->oo_oinfo; struct osc_cache_waiter ocw; - struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL, - LWI_ON_SIGNAL_NOOP, NULL); + struct l_wait_info lwi; int rc = -EDQUOT; - OSC_DUMP_GRANT(D_CACHE, cli, "need:%d.\n", bytes); + lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(AT_OFF ? obd_timeout : at_max), + NULL, LWI_ON_SIGNAL_NOOP, NULL); + + OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes); spin_lock(&cli->cl_loi_list_lock); @@ -1595,12 +1597,14 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli, if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) || !cli->cl_dirty_max_pages || cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) { + OSC_DUMP_GRANT(D_CACHE, cli, "forced sync i/o\n"); rc = -EDQUOT; goto out; } /* Hopefully normal case - cache space and write credits available */ if (osc_enter_cache_try(cli, oap, bytes, 0)) { + OSC_DUMP_GRANT(D_CACHE, cli, "granted from cache\n"); rc = 0; goto out; } @@ -1629,32 +1633,49 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli, spin_lock(&cli->cl_loi_list_lock); - /* l_wait_event is interrupted by signal, or timed out */ if (rc < 0) { - if (rc == -ETIMEDOUT) { - OSC_DUMP_GRANT(D_ERROR, cli, - "try to reserve %d.\n", bytes); - osc_extent_tree_dump(D_ERROR, osc); - rc = -EDQUOT; - } - + /* l_wait_event is interrupted by signal, or timed out */ list_del_init(&ocw.ocw_entry); - goto out; + break; } - LASSERT(list_empty(&ocw.ocw_entry)); rc = ocw.ocw_rc; if (rc != -EDQUOT) - goto out; + break; if (osc_enter_cache_try(cli, oap, bytes, 0)) { rc = 0; - goto out; + break; } } + + switch (rc) { + case 0: + OSC_DUMP_GRANT(D_CACHE, cli, "finally got grant space\n"); + break; + case -ETIMEDOUT: + OSC_DUMP_GRANT(D_CACHE, cli, + "timeout, fall back to sync i/o\n"); + osc_extent_tree_dump(D_CACHE, osc); + /* fall back to synchronous I/O */ + rc = -EDQUOT; + break; + case -EINTR: + /* Ensures restartability - LU-3581 */ + OSC_DUMP_GRANT(D_CACHE, cli, "interrupted\n"); + rc = -ERESTARTSYS; + break; + case -EDQUOT: + OSC_DUMP_GRANT(D_CACHE, cli, + "no grant space, fall back to sync i/o\n"); + break; + default: + CDEBUG(D_CACHE, "%s: event for cache space @ %p never arrived due to %d, fall back to sync i/o\n", + cli->cl_import->imp_obd->obd_name, &ocw, rc); + break; + } out: spin_unlock(&cli->cl_loi_list_lock); - OSC_DUMP_GRANT(D_CACHE, cli, "returned %d.\n", rc); return rc; } @@ -1679,10 +1700,8 @@ void osc_wake_cache_waiters(struct client_obd *cli) goto wakeup; } - ocw->ocw_rc = 0; - if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0)) - ocw->ocw_rc = -EDQUOT; - + if (osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0)) + ocw->ocw_rc = 0; wakeup: CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld, %d\n", ocw, ocw->ocw_oap, cli->cl_avail_grant, ocw->ocw_rc); -- 1.7.1 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
