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staging/lustre/ptlrpc: convert to new shrinker API 

Convert sptlrpc encode pool shrinker to use scan/count API.

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Peng Tao 2013-08-28 10:18:20 +10:00 committed by Al Viro
parent fe92a0557a
commit 3bb22ec53e
1 changed files with 44 additions and 36 deletions
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80
drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c
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@ -120,13 +120,6 @@ static struct ptlrpc_enc_page_pool {
struct page ***epp_pools;
} page_pools;
/*
* memory shrinker
*/
const int pools_shrinker_seeks = DEFAULT_SEEKS;
static struct shrinker *pools_shrinker = NULL;
/*
* /proc/fs/lustre/sptlrpc/encrypt_page_pools
*/
@ -226,30 +219,11 @@ static void enc_pools_release_free_pages(long npages)
}
/*
* could be called frequently for query (@nr_to_scan == 0).
* we try to keep at least PTLRPC_MAX_BRW_PAGES pages in the pool.
*/
static int enc_pools_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
static unsigned long enc_pools_shrink_count(struct shrinker *s,
struct shrink_control *sc)
{
if (unlikely(shrink_param(sc, nr_to_scan) != 0)) {
spin_lock(&page_pools.epp_lock);
shrink_param(sc, nr_to_scan) = min_t(unsigned long,
shrink_param(sc, nr_to_scan),
page_pools.epp_free_pages -
PTLRPC_MAX_BRW_PAGES);
if (shrink_param(sc, nr_to_scan) > 0) {
enc_pools_release_free_pages(shrink_param(sc,
nr_to_scan));
CDEBUG(D_SEC, "released %ld pages, %ld left\n",
(long)shrink_param(sc, nr_to_scan),
page_pools.epp_free_pages);
page_pools.epp_st_shrinks++;
page_pools.epp_last_shrink = cfs_time_current_sec();
}
spin_unlock(&page_pools.epp_lock);
}
/*
* if no pool access for a long time, we consider it's fully idle.
* a little race here is fine.
@ -266,6 +240,40 @@ static int enc_pools_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
(IDLE_IDX_MAX - page_pools.epp_idle_idx) / IDLE_IDX_MAX;
}
/*
* we try to keep at least PTLRPC_MAX_BRW_PAGES pages in the pool.
*/
static unsigned long enc_pools_shrink_scan(struct shrinker *s,
struct shrink_control *sc)
{
spin_lock(&page_pools.epp_lock);
sc->nr_to_scan = min_t(unsigned long, sc->nr_to_scan,
page_pools.epp_free_pages - PTLRPC_MAX_BRW_PAGES);
if (sc->nr_to_scan > 0) {
enc_pools_release_free_pages(sc->nr_to_scan);
CDEBUG(D_SEC, "released %ld pages, %ld left\n",
(long)sc->nr_to_scan, page_pools.epp_free_pages);
page_pools.epp_st_shrinks++;
page_pools.epp_last_shrink = cfs_time_current_sec();
}
spin_unlock(&page_pools.epp_lock);
/*
* if no pool access for a long time, we consider it's fully idle.
* a little race here is fine.
*/
if (unlikely(cfs_time_current_sec() - page_pools.epp_last_access >
CACHE_QUIESCENT_PERIOD)) {
spin_lock(&page_pools.epp_lock);
page_pools.epp_idle_idx = IDLE_IDX_MAX;
spin_unlock(&page_pools.epp_lock);
}
LASSERT(page_pools.epp_idle_idx <= IDLE_IDX_MAX);
return sc->nr_to_scan;
}
static inline
int npages_to_npools(unsigned long npages)
{
@ -699,6 +707,12 @@ static inline void enc_pools_free(void)
sizeof(*page_pools.epp_pools));
}
static struct shrinker pools_shrinker = {
.count_objects = enc_pools_shrink_count,
.scan_objects = enc_pools_shrink_scan,
.seeks = DEFAULT_SEEKS,
};
int sptlrpc_enc_pool_init(void)
{
/*
@ -736,12 +750,7 @@ int sptlrpc_enc_pool_init(void)
if (page_pools.epp_pools == NULL)
return -ENOMEM;
pools_shrinker = set_shrinker(pools_shrinker_seeks,
enc_pools_shrink);
if (pools_shrinker == NULL) {
enc_pools_free();
return -ENOMEM;
}
register_shrinker(&pools_shrinker);
return 0;
}
@ -750,11 +759,10 @@ void sptlrpc_enc_pool_fini(void)
{
unsigned long cleaned, npools;
LASSERT(pools_shrinker);
LASSERT(page_pools.epp_pools);
LASSERT(page_pools.epp_total_pages == page_pools.epp_free_pages);
remove_shrinker(pools_shrinker);
unregister_shrinker(&pools_shrinker);
npools = npages_to_npools(page_pools.epp_total_pages);
cleaned = enc_pools_cleanup(page_pools.epp_pools, npools);