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Tue, 30 Jan 2024 11:31:32 -0800 (PST) MIME-Version: 1.0 References: <20240130014208.565554-1-hannes@cmpxchg.org> <20240130014208.565554-11-hannes@cmpxchg.org> In-Reply-To: <20240130014208.565554-11-hannes@cmpxchg.org> From: Nhat Pham Date: Tue, 30 Jan 2024 11:31:21 -0800 Message-ID: Subject: Re: [PATCH 10/20] mm: zswap: function ordering: pool alloc & free To: Johannes Weiner Cc: Andrew Morton , Yosry Ahmed , Chengming Zhou , linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: AE28C1A0020 X-Rspam-User: X-Stat-Signature: h7tsofpgdypz834z8j9791xywx768t1n X-Rspamd-Server: rspam01 X-HE-Tag: 1706643093-432066 X-HE-Meta: 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 kuXuz1vA xLqDTSXwk/GMd1DxnH1AM2Lct5QqIkC6Ancz6q8LAjUCCi+8HHUZelZRV184hT84mVrA2zel69GJynkd/v/LjsWRhsocFSVfbBBEafLB1mx5Wzx6ONpNyrJQDnX6r4ZDLpR6hdgqr0hGVNPA2etvf/fAROrl7iBdXtJdliL/WjfbkyLJw4/qY+Sr165Sp/0ses7fFVjrz+XXT0k45jsVxa7NYcd2Y0tMGtDn5ZaJ9oRiXkjmTHxqgGuY49E/6uMs6lNfZoSK8NpBr8hkDmP+MbO9FikeXXoVX2BVxOPFJoh/PBvpzfgEyif/uqn5rqZpzrbDW+diK7o7R9Cz5PtwyUE1UUHHREqA3HsTikEYNigNaX8rApFiD6it4jw6wNNeG29pGkshnvZ7Nz872o+ZbmSt3fxImmPRepEfYpwTIXSp3Ykcm+wTObwb30w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jan 29, 2024 at 5:42=E2=80=AFPM Johannes Weiner wrote: > > The function ordering in zswap.c is a little chaotic, which requires > jumping in unexpected directions when following related code. This is > a series of patches that brings the file into the following order: > > - pool functions > - lru functions > - rbtree functions > - zswap entry functions > - compression/backend functions > - writeback & shrinking functions > - store, load, invalidate, swapon, swapoff > - debugfs > - init This ordering seems reasonable to me. Then again, we don't have any coherent ordering of functions, so anything would be an improvement :) > > But it has to be split up such the moving still produces halfway > readable diffs. > > In this patch, move pool allocation and freeing functions. > > Signed-off-by: Johannes Weiner Reviewed-by: Nhat Pham > --- > mm/zswap.c | 297 +++++++++++++++++++++++++++-------------------------- > 1 file changed, 152 insertions(+), 145 deletions(-) > > diff --git a/mm/zswap.c b/mm/zswap.c > index 082d076a758d..805d9a35f633 100644 > --- a/mm/zswap.c > +++ b/mm/zswap.c > @@ -320,6 +320,158 @@ static void zswap_update_total_size(void) > zswap_pool_total_size =3D total; > } > > +/********************************* > +* pool functions > +**********************************/ > + > +static void zswap_alloc_shrinker(struct zswap_pool *pool); > +static void shrink_worker(struct work_struct *w); > + > +static struct zswap_pool *zswap_pool_create(char *type, char *compressor= ) > +{ > + int i; > + struct zswap_pool *pool; > + char name[38]; /* 'zswap' + 32 char (max) num + \0 */ > + gfp_t gfp =3D __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM= ; > + int ret; > + > + if (!zswap_has_pool) { > + /* if either are unset, pool initialization failed, and w= e > + * need both params to be set correctly before trying to > + * create a pool. > + */ > + if (!strcmp(type, ZSWAP_PARAM_UNSET)) > + return NULL; > + if (!strcmp(compressor, ZSWAP_PARAM_UNSET)) > + return NULL; > + } > + > + pool =3D kzalloc(sizeof(*pool), GFP_KERNEL); > + if (!pool) > + return NULL; > + > + for (i =3D 0; i < ZSWAP_NR_ZPOOLS; i++) { > + /* unique name for each pool specifically required by zsm= alloc */ > + snprintf(name, 38, "zswap%x", > + atomic_inc_return(&zswap_pools_count)); > + > + pool->zpools[i] =3D zpool_create_pool(type, name, gfp); > + if (!pool->zpools[i]) { > + pr_err("%s zpool not available\n", type); > + goto error; > + } > + } > + pr_debug("using %s zpool\n", zpool_get_type(pool->zpools[0])); > + > + strscpy(pool->tfm_name, compressor, sizeof(pool->tfm_name)); > + > + pool->acomp_ctx =3D alloc_percpu(*pool->acomp_ctx); > + if (!pool->acomp_ctx) { > + pr_err("percpu alloc failed\n"); > + goto error; > + } > + > + ret =3D cpuhp_state_add_instance(CPUHP_MM_ZSWP_POOL_PREPARE, > + &pool->node); > + if (ret) > + goto error; > + > + zswap_alloc_shrinker(pool); > + if (!pool->shrinker) > + goto error; > + > + pr_debug("using %s compressor\n", pool->tfm_name); > + > + /* being the current pool takes 1 ref; this func expects the > + * caller to always add the new pool as the current pool > + */ > + kref_init(&pool->kref); > + INIT_LIST_HEAD(&pool->list); > + if (list_lru_init_memcg(&pool->list_lru, pool->shrinker)) > + goto lru_fail; > + shrinker_register(pool->shrinker); > + INIT_WORK(&pool->shrink_work, shrink_worker); > + atomic_set(&pool->nr_stored, 0); > + > + zswap_pool_debug("created", pool); > + > + return pool; > + > +lru_fail: > + list_lru_destroy(&pool->list_lru); > + shrinker_free(pool->shrinker); > +error: > + if (pool->acomp_ctx) > + free_percpu(pool->acomp_ctx); > + while (i--) > + zpool_destroy_pool(pool->zpools[i]); > + kfree(pool); > + return NULL; > +} > + > +static struct zswap_pool *__zswap_pool_create_fallback(void) > +{ > + bool has_comp, has_zpool; > + > + has_comp =3D crypto_has_acomp(zswap_compressor, 0, 0); > + if (!has_comp && strcmp(zswap_compressor, > + CONFIG_ZSWAP_COMPRESSOR_DEFAULT)) { > + pr_err("compressor %s not available, using default %s\n", > + zswap_compressor, CONFIG_ZSWAP_COMPRESSOR_DEFAULT)= ; > + param_free_charp(&zswap_compressor); > + zswap_compressor =3D CONFIG_ZSWAP_COMPRESSOR_DEFAULT; > + has_comp =3D crypto_has_acomp(zswap_compressor, 0, 0); > + } > + if (!has_comp) { > + pr_err("default compressor %s not available\n", > + zswap_compressor); > + param_free_charp(&zswap_compressor); > + zswap_compressor =3D ZSWAP_PARAM_UNSET; > + } > + > + has_zpool =3D zpool_has_pool(zswap_zpool_type); > + if (!has_zpool && strcmp(zswap_zpool_type, > + CONFIG_ZSWAP_ZPOOL_DEFAULT)) { > + pr_err("zpool %s not available, using default %s\n", > + zswap_zpool_type, CONFIG_ZSWAP_ZPOOL_DEFAULT); > + param_free_charp(&zswap_zpool_type); > + zswap_zpool_type =3D CONFIG_ZSWAP_ZPOOL_DEFAULT; > + has_zpool =3D zpool_has_pool(zswap_zpool_type); > + } > + if (!has_zpool) { > + pr_err("default zpool %s not available\n", > + zswap_zpool_type); > + param_free_charp(&zswap_zpool_type); > + zswap_zpool_type =3D ZSWAP_PARAM_UNSET; > + } > + > + if (!has_comp || !has_zpool) > + return NULL; > + > + return zswap_pool_create(zswap_zpool_type, zswap_compressor); > +} > + > +static void zswap_pool_destroy(struct zswap_pool *pool) > +{ > + int i; > + > + zswap_pool_debug("destroying", pool); > + > + shrinker_free(pool->shrinker); > + cpuhp_state_remove_instance(CPUHP_MM_ZSWP_POOL_PREPARE, &pool->no= de); > + free_percpu(pool->acomp_ctx); > + list_lru_destroy(&pool->list_lru); > + > + spin_lock(&zswap_pools_lock); > + mem_cgroup_iter_break(NULL, pool->next_shrink); > + pool->next_shrink =3D NULL; > + spin_unlock(&zswap_pools_lock); > + > + for (i =3D 0; i < ZSWAP_NR_ZPOOLS; i++) > + zpool_destroy_pool(pool->zpools[i]); > + kfree(pool); > +} > + > /* should be called under RCU */ > #ifdef CONFIG_MEMCG > static inline struct mem_cgroup *mem_cgroup_from_entry(struct zswap_entr= y *entry) > @@ -970,151 +1122,6 @@ static void shrink_worker(struct work_struct *w) > zswap_pool_put(pool); > } > > -static struct zswap_pool *zswap_pool_create(char *type, char *compressor= ) > -{ > - int i; > - struct zswap_pool *pool; > - char name[38]; /* 'zswap' + 32 char (max) num + \0 */ > - gfp_t gfp =3D __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM= ; > - int ret; > - > - if (!zswap_has_pool) { > - /* if either are unset, pool initialization failed, and w= e > - * need both params to be set correctly before trying to > - * create a pool. > - */ > - if (!strcmp(type, ZSWAP_PARAM_UNSET)) > - return NULL; > - if (!strcmp(compressor, ZSWAP_PARAM_UNSET)) > - return NULL; > - } > - > - pool =3D kzalloc(sizeof(*pool), GFP_KERNEL); > - if (!pool) > - return NULL; > - > - for (i =3D 0; i < ZSWAP_NR_ZPOOLS; i++) { > - /* unique name for each pool specifically required by zsm= alloc */ > - snprintf(name, 38, "zswap%x", > - atomic_inc_return(&zswap_pools_count)); > - > - pool->zpools[i] =3D zpool_create_pool(type, name, gfp); > - if (!pool->zpools[i]) { > - pr_err("%s zpool not available\n", type); > - goto error; > - } > - } > - pr_debug("using %s zpool\n", zpool_get_type(pool->zpools[0])); > - > - strscpy(pool->tfm_name, compressor, sizeof(pool->tfm_name)); > - > - pool->acomp_ctx =3D alloc_percpu(*pool->acomp_ctx); > - if (!pool->acomp_ctx) { > - pr_err("percpu alloc failed\n"); > - goto error; > - } > - > - ret =3D cpuhp_state_add_instance(CPUHP_MM_ZSWP_POOL_PREPARE, > - &pool->node); > - if (ret) > - goto error; > - > - zswap_alloc_shrinker(pool); > - if (!pool->shrinker) > - goto error; > - > - pr_debug("using %s compressor\n", pool->tfm_name); > - > - /* being the current pool takes 1 ref; this func expects the > - * caller to always add the new pool as the current pool > - */ > - kref_init(&pool->kref); > - INIT_LIST_HEAD(&pool->list); > - if (list_lru_init_memcg(&pool->list_lru, pool->shrinker)) > - goto lru_fail; > - shrinker_register(pool->shrinker); > - INIT_WORK(&pool->shrink_work, shrink_worker); > - atomic_set(&pool->nr_stored, 0); > - > - zswap_pool_debug("created", pool); > - > - return pool; > - > -lru_fail: > - list_lru_destroy(&pool->list_lru); > - shrinker_free(pool->shrinker); > -error: > - if (pool->acomp_ctx) > - free_percpu(pool->acomp_ctx); > - while (i--) > - zpool_destroy_pool(pool->zpools[i]); > - kfree(pool); > - return NULL; > -} > - > -static struct zswap_pool *__zswap_pool_create_fallback(void) > -{ > - bool has_comp, has_zpool; > - > - has_comp =3D crypto_has_acomp(zswap_compressor, 0, 0); > - if (!has_comp && strcmp(zswap_compressor, > - CONFIG_ZSWAP_COMPRESSOR_DEFAULT)) { > - pr_err("compressor %s not available, using default %s\n", > - zswap_compressor, CONFIG_ZSWAP_COMPRESSOR_DEFAULT)= ; > - param_free_charp(&zswap_compressor); > - zswap_compressor =3D CONFIG_ZSWAP_COMPRESSOR_DEFAULT; > - has_comp =3D crypto_has_acomp(zswap_compressor, 0, 0); > - } > - if (!has_comp) { > - pr_err("default compressor %s not available\n", > - zswap_compressor); > - param_free_charp(&zswap_compressor); > - zswap_compressor =3D ZSWAP_PARAM_UNSET; > - } > - > - has_zpool =3D zpool_has_pool(zswap_zpool_type); > - if (!has_zpool && strcmp(zswap_zpool_type, > - CONFIG_ZSWAP_ZPOOL_DEFAULT)) { > - pr_err("zpool %s not available, using default %s\n", > - zswap_zpool_type, CONFIG_ZSWAP_ZPOOL_DEFAULT); > - param_free_charp(&zswap_zpool_type); > - zswap_zpool_type =3D CONFIG_ZSWAP_ZPOOL_DEFAULT; > - has_zpool =3D zpool_has_pool(zswap_zpool_type); > - } > - if (!has_zpool) { > - pr_err("default zpool %s not available\n", > - zswap_zpool_type); > - param_free_charp(&zswap_zpool_type); > - zswap_zpool_type =3D ZSWAP_PARAM_UNSET; > - } > - > - if (!has_comp || !has_zpool) > - return NULL; > - > - return zswap_pool_create(zswap_zpool_type, zswap_compressor); > -} > - > -static void zswap_pool_destroy(struct zswap_pool *pool) > -{ > - int i; > - > - zswap_pool_debug("destroying", pool); > - > - shrinker_free(pool->shrinker); > - cpuhp_state_remove_instance(CPUHP_MM_ZSWP_POOL_PREPARE, &pool->no= de); > - free_percpu(pool->acomp_ctx); > - list_lru_destroy(&pool->list_lru); > - > - spin_lock(&zswap_pools_lock); > - mem_cgroup_iter_break(NULL, pool->next_shrink); > - pool->next_shrink =3D NULL; > - spin_unlock(&zswap_pools_lock); > - > - for (i =3D 0; i < ZSWAP_NR_ZPOOLS; i++) > - zpool_destroy_pool(pool->zpools[i]); > - kfree(pool); > -} > - > static int __must_check zswap_pool_get(struct zswap_pool *pool) > { > if (!pool) > -- > 2.43.0 >