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Commit bbf58bf3 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4.2/pnfs: Make the layoutstats timer configurable 



Allow advanced users to set the layoutstats timer in order to lengthen
or shorten the period between layoutstat transmissions to the server.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 266d12d4

Documentation/kernel-parameters.txt

+9 −0
Original line number Diff line number Diff line
@@ -2279,6 +2279,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			The default parameter value of '0' causes the kernel

			not to attempt recovery of lost locks.



	nfs4.layoutstats_timer =

			[NFSv4.2] Change the rate at which the kernel sends

			layoutstats to the pNFS metadata server.



			Setting this to value to 0 causes the kernel to use

			whatever value is the default set by the layout

			driver. A non-zero value sets the minimum interval

			in seconds between layoutstats transmissions.



	nfsd.nfs4_disable_idmapping=

			[NFSv4] When set to the default of '1', the NFSv4

			server will return only numeric uids and gids to

fs/nfs/flexfilelayout/flexfilelayout.c

+4 −1
Original line number Diff line number Diff line
@@ -533,14 +533,17 @@ nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 
			    ktime_t now)

{

	static const ktime_t notime = {0};

	s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;



	nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);

	if (ktime_equal(mirror->start_time, notime))

		mirror->start_time = now;

	if (ktime_equal(mirror->last_report_time, notime))

		mirror->last_report_time = now;

	if (layoutstats_timer != 0)

		report_interval = (s64)layoutstats_timer * 1000LL;

	if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=

			FF_LAYOUTSTATS_REPORT_INTERVAL) {

			report_interval) {

		mirror->last_report_time = now;

		return true;

	}

fs/nfs/pnfs.c

+4 −0
Original line number Diff line number Diff line
@@ -2285,3 +2285,7 @@ pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 
}

EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);

#endif



unsigned int layoutstats_timer;

module_param(layoutstats_timer, uint, 0644);

EXPORT_SYMBOL_GPL(layoutstats_timer);

fs/nfs/pnfs.h

+3 −0
Original line number Diff line number Diff line
@@ -528,12 +528,15 @@ pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 
					nfss->pnfs_curr_ld->id == src->l_type);

}



extern unsigned int layoutstats_timer;



#ifdef NFS_DEBUG

void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);

#else

static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)

{

}



#endif /* NFS_DEBUG */

#else  /* CONFIG_NFS_V4_1 */