Commit 0c193054 authored by Andy Adamson's avatar Andy Adamson Committed by J. Bruce Fields
Browse files

nfsd41: hange from page to memory based drc limits 



NFSD_SLOT_CACHE_SIZE is the size of all encoded operation responses
(excluding the sequence operation) that we want to cache.

For now, keep NFSD_SLOT_CACHE_SIZE at PAGE_SIZE. It will be reduced
when the DRC is changed from page based to memory based.

Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
parent 6a14dd1a

fs/nfsd/nfs4state.c

+13 −15
Original line number Diff line number Diff line
@@ -414,31 +414,31 @@ gen_sessionid(struct nfsd4_session *ses) 


/*

 * Give the client the number of slots it requests bound by

 * NFSD_MAX_SLOTS_PER_SESSION and by sv_drc_max_pages.

 * NFSD_MAX_SLOTS_PER_SESSION and by nfsd_drc_max_mem.

 *

 * If we run out of pages (sv_drc_pages_used == sv_drc_max_pages) we

 * should (up to a point) re-negotiate active sessions and reduce their

 * slot usage to make rooom for new connections. For now we just fail the

 * create session.

 * If we run out of reserved DRC memory we should (up to a point) re-negotiate

 * active sessions and reduce their slot usage to make rooom for new

 * connections. For now we just fail the create session.

 */

static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)

{

	int np;

	int mem;



	if (fchan->maxreqs < 1)

		return nfserr_inval;

	else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)

		fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;



	np = fchan->maxreqs * NFSD_PAGES_PER_SLOT;

	mem = fchan->maxreqs * NFSD_SLOT_CACHE_SIZE;



	spin_lock(&nfsd_drc_lock);

	if (np + nfsd_drc_pages_used > nfsd_drc_max_pages)

		np = nfsd_drc_max_pages - nfsd_drc_pages_used;

	nfsd_drc_pages_used += np;

	if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem)

		mem = ((nfsd_drc_max_mem - nfsd_drc_mem_used) /

				NFSD_SLOT_CACHE_SIZE) * NFSD_SLOT_CACHE_SIZE;

	nfsd_drc_mem_used += mem;

	spin_unlock(&nfsd_drc_lock);



	fchan->maxreqs = np / NFSD_PAGES_PER_SLOT;

	fchan->maxreqs = mem / NFSD_SLOT_CACHE_SIZE;

	if (fchan->maxreqs == 0)

		return nfserr_resource;

	return 0;
@@ -465,9 +465,7 @@ static int init_forechannel_attrs(struct svc_rqst *rqstp, 
		fchan->maxresp_sz = maxcount;

	session_fchan->maxresp_sz = fchan->maxresp_sz;



	/* Set the max response cached size our default which is

	 * a multiple of PAGE_SIZE and small */

	session_fchan->maxresp_cached = NFSD_PAGES_PER_SLOT * PAGE_SIZE;

	session_fchan->maxresp_cached = NFSD_SLOT_CACHE_SIZE;

	fchan->maxresp_cached = session_fchan->maxresp_cached;



	/* Use the client's maxops if possible */
@@ -585,7 +583,7 @@ free_session(struct kref *kref) 
		nfsd4_release_respages(e->ce_respages, e->ce_resused);

	}

	spin_lock(&nfsd_drc_lock);

	nfsd_drc_pages_used -= ses->se_fchannel.maxreqs * NFSD_PAGES_PER_SLOT;

	nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;

	spin_unlock(&nfsd_drc_lock);

	kfree(ses);

}

fs/nfsd/nfssvc.c

+6 −7
Original line number Diff line number Diff line
@@ -74,8 +74,8 @@ struct svc_serv *nfsd_serv; 
 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.

 */

spinlock_t	nfsd_drc_lock;

unsigned int	nfsd_drc_max_pages;

unsigned int	nfsd_drc_pages_used;

unsigned int	nfsd_drc_max_mem;

unsigned int	nfsd_drc_mem_used;



#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)

static struct svc_stat	nfsd_acl_svcstats;
@@ -247,12 +247,11 @@ void nfsd_reset_versions(void) 
static void set_max_drc(void)

{

	#define NFSD_DRC_SIZE_SHIFT	10

	nfsd_drc_max_pages = nr_free_buffer_pages()

						>> NFSD_DRC_SIZE_SHIFT;

	nfsd_drc_pages_used = 0;

	nfsd_drc_max_mem = (nr_free_buffer_pages()

					>> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;

	nfsd_drc_mem_used = 0;

	spin_lock_init(&nfsd_drc_lock);

	dprintk("%s nfsd_drc_max_pages %u\n", __func__,

		nfsd_drc_max_pages);

	dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);

}



int nfsd_create_serv(void)

include/linux/nfsd/nfsd.h

+2 −2
Original line number Diff line number Diff line
@@ -57,8 +57,8 @@ extern u32 nfsd_supported_minorversion; 
extern struct mutex		nfsd_mutex;

extern struct svc_serv		*nfsd_serv;

extern spinlock_t		nfsd_drc_lock;

extern unsigned int		nfsd_drc_max_pages;

extern unsigned int		nfsd_drc_pages_used;

extern unsigned int		nfsd_drc_max_mem;

extern unsigned int		nfsd_drc_mem_used;



extern struct seq_operations nfs_exports_op;

include/linux/nfsd/state.h

+1 −0
Original line number Diff line number Diff line
@@ -96,6 +96,7 @@ struct nfs4_cb_conn { 
#define NFSD_MAX_SLOTS_PER_SESSION	128

/* Maximum number of pages per slot cache entry */

#define NFSD_PAGES_PER_SLOT	1

#define NFSD_SLOT_CACHE_SIZE		PAGE_SIZE

/* Maximum number of operations per session compound */

#define NFSD_MAX_OPS_PER_COMPOUND	16

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