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nfsd41: use globals for DRC limits

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The version 4.1 DRC memory limit and tracking variables are server wide and
session specific. Replace struct svc_serv fields with globals.
Stop using the svc_serv sv_lock.

Add a spinlock to serialize access to the DRC limit management variables which
change on session creation and deletion (usage counter) or (future)
administrative action to adjust the total DRC memory limit.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Andy Adamson 2009-06-24 15:37:45 -04:00 committed by J. Bruce Fields
parent 7702ce40bc
commit 4bd9b0f4af
4 changed files with 23 additions and 11 deletions
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10
fs/nfsd/nfs4state.c
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@ -430,11 +430,11 @@ static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)
else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
spin_lock(&nfsd_serv->sv_lock);
if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages)
np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used;
nfsd_serv->sv_drc_pages_used += np;
spin_unlock(&nfsd_serv->sv_lock);
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;
spin_unlock(&nfsd_drc_lock);
if (np <= 0) {
status = nfserr_resource;

19
fs/nfsd/nfssvc.c
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@ -67,6 +67,16 @@ struct timeval nfssvc_boot;
DEFINE_MUTEX(nfsd_mutex);
struct svc_serv *nfsd_serv;
/*
* nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
* nfsd_drc_max_pages limits the total amount of memory available for
* version 4.1 DRC caches.
* 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;
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
static struct svc_stat nfsd_acl_svcstats;
static struct svc_version * nfsd_acl_version[] = {
@ -238,11 +248,12 @@ static void set_max_drc(void)
{
/* The percent of nr_free_buffer_pages used by the V4.1 server DRC */
#define NFSD_DRC_SIZE_SHIFT 7
nfsd_serv->sv_drc_max_pages = nr_free_buffer_pages()
nfsd_drc_max_pages = nr_free_buffer_pages()
>> NFSD_DRC_SIZE_SHIFT;
nfsd_serv->sv_drc_pages_used = 0;
dprintk("%s svc_drc_max_pages %u\n", __func__,
nfsd_serv->sv_drc_max_pages);
nfsd_drc_pages_used = 0;
spin_lock_init(&nfsd_drc_lock);
dprintk("%s nfsd_drc_max_pages %u\n", __func__,
nfsd_drc_max_pages);
}
int nfsd_create_serv(void)

3
include/linux/nfsd/nfsd.h
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@ -56,6 +56,9 @@ extern struct svc_version nfsd_version2, nfsd_version3,
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 struct seq_operations nfs_exports_op;

2
include/linux/sunrpc/svc.h
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@ -94,8 +94,6 @@ struct svc_serv {
struct module * sv_module; /* optional module to count when
* adding threads */
svc_thread_fn sv_function; /* main function for threads */
unsigned int sv_drc_max_pages; /* Total pages for DRC */
unsigned int sv_drc_pages_used;/* DRC pages used */
#if defined(CONFIG_NFS_V4_1)
struct list_head sv_cb_list; /* queue for callback requests
* that arrive over the same