From: Bruno Faccini <bruno.facc...@intel.com> As part of LU-3848 and LU-4330, it has been discovered that LNET MEs and small MDs (<=128 Bytes) are allocated in <size-128> kmem_cache and thus can suffer quite frequent corruptions, from other modules or Kernel parts, that occur there. To avoid this, MEs and small-MDs specific kmem_cache have been created.
Signed-off-by: Bruno Faccini <bruno.facc...@intel.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4430 Reviewed-on: http://review.whamcloud.com/18586 Reviewed-by: Andreas Dilger <andreas.dil...@intel.com> Reviewed-by: Doug Oucharek <doug.s.oucha...@intel.com> Reviewed-by: Oleg Drokin <oleg.dro...@intel.com> Signed-off-by: James Simmons <jsimm...@infradead.org> --- .../staging/lustre/include/linux/lnet/lib-lnet.h | 36 ++++++++++++++-- drivers/staging/lustre/lnet/lnet/api-ni.c | 45 ++++++++++++++++++++ 2 files changed, 77 insertions(+), 4 deletions(-) diff --git a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h index 513a822..51ad729 100644 --- a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h +++ b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h @@ -178,6 +178,11 @@ lnet_net_lock_current(void) #define MAX_PORTALS 64 +#define LNET_SMALL_MD_SIZE offsetof(lnet_libmd_t, md_iov.iov[1]) +extern struct kmem_cache *lnet_mes_cachep; /* MEs kmem_cache */ +extern struct kmem_cache *lnet_small_mds_cachep;/* <= LNET_SMALL_MD_SIZE bytes + * MDs kmem_cache + */ static inline lnet_eq_t * lnet_eq_alloc(void) { @@ -208,7 +213,19 @@ lnet_md_alloc(lnet_md_t *umd) size = offsetof(lnet_libmd_t, md_iov.iov[niov]); } - LIBCFS_ALLOC(md, size); + if (size <= LNET_SMALL_MD_SIZE) { + md = kmem_cache_alloc(lnet_small_mds_cachep, + GFP_NOFS | __GFP_ZERO); + if (md) { + CDEBUG(D_MALLOC, "slab-alloced 'md' of size %u at %p.\n", + size, md); + } else { + CDEBUG(D_MALLOC, "failed to allocate 'md' of size %u\n", + size); + } + } else { + LIBCFS_ALLOC(md, size); + } if (md) { /* Set here in case of early free */ @@ -230,7 +247,12 @@ lnet_md_free(lnet_libmd_t *md) else size = offsetof(lnet_libmd_t, md_iov.iov[md->md_niov]); - LIBCFS_FREE(md, size); + if (size <= LNET_SMALL_MD_SIZE) { + CDEBUG(D_MALLOC, "slab-freed 'md' at %p.\n", md); + kmem_cache_free(lnet_small_mds_cachep, md); + } else { + LIBCFS_FREE(md, size); + } } static inline lnet_me_t * @@ -238,14 +260,20 @@ lnet_me_alloc(void) { lnet_me_t *me; - LIBCFS_ALLOC(me, sizeof(*me)); + me = kmem_cache_alloc(lnet_mes_cachep, GFP_NOFS | __GFP_ZERO); + if (me) + CDEBUG(D_MALLOC, "slab-alloced 'me' at %p.\n", me); + else + CDEBUG(D_MALLOC, "failed to allocate 'me'\n"); + return me; } static inline void lnet_me_free(lnet_me_t *me) { - LIBCFS_FREE(me, sizeof(*me)); + CDEBUG(D_MALLOC, "slab-freed 'me' at %p.\n", me); + kmem_cache_free(lnet_mes_cachep, me); } static inline lnet_msg_t * diff --git a/drivers/staging/lustre/lnet/lnet/api-ni.c b/drivers/staging/lustre/lnet/lnet/api-ni.c index fe0dbe7..9db0ff1 100644 --- a/drivers/staging/lustre/lnet/lnet/api-ni.c +++ b/drivers/staging/lustre/lnet/lnet/api-ni.c @@ -103,6 +103,46 @@ lnet_init_locks(void) mutex_init(&the_lnet.ln_api_mutex); } +struct kmem_cache *lnet_mes_cachep; /* MEs kmem_cache */ +struct kmem_cache *lnet_small_mds_cachep; /* <= LNET_SMALL_MD_SIZE bytes + * MDs kmem_cache + */ +static int +lnet_descriptor_setup(void) +{ + /* + * create specific kmem_cache for MEs and small MDs (i.e., originally + * allocated in <size-xxx> kmem_cache). + */ + lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(lnet_me_t), + 0, 0, NULL); + if (!lnet_mes_cachep) + return -ENOMEM; + + lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs", + LNET_SMALL_MD_SIZE, 0, 0, + NULL); + if (!lnet_small_mds_cachep) + return -ENOMEM; + + return 0; +} + +static void +lnet_descriptor_cleanup(void) +{ + + if (lnet_small_mds_cachep) { + kmem_cache_destroy(lnet_small_mds_cachep); + lnet_small_mds_cachep = NULL; + } + + if (lnet_mes_cachep) { + kmem_cache_destroy(lnet_mes_cachep); + lnet_mes_cachep = NULL; + } +} + static int lnet_create_remote_nets_table(void) { @@ -553,6 +593,10 @@ lnet_prepare(lnet_pid_t requested_pid) INIT_LIST_HEAD(&the_lnet.ln_drop_rules); INIT_LIST_HEAD(&the_lnet.ln_delay_rules); + rc = lnet_descriptor_setup(); + if (rc) + goto failed; + rc = lnet_create_remote_nets_table(); if (rc) goto failed; @@ -652,6 +696,7 @@ lnet_unprepare(void) the_lnet.ln_counters = NULL; } lnet_destroy_remote_nets_table(); + lnet_descriptor_cleanup(); return 0; } -- 1.7.1 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
