From patchwork Sat Dec 21 06:31:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kanchana P Sridhar X-Patchwork-Id: 852802 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1DC841F2377; Sat, 21 Dec 2024 06:31:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.20 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734762691; cv=none; b=eXDbnYhw3w2BwIvVNJlX5xDrlXuz5HBZbRM8xtQmsyQgBrkxJn8fkvZM647pCWq6dKQhDzPpZmYQiLrcoy/ot0UUru/XCq8yMP/axDKgoF8sxFdtToM254SnTDN1tYL/MwtqB5f/aCPr5JgLwTlU/ffkuJnMrVBZHYXr12wzNAo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734762691; c=relaxed/simple; bh=KPv/lIOr9UJuu1TDwAGjapkWxba0uS6X9GnVkLeTgfc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=WCdWCwAemrGDSqUxnzRb7De1hgnvS6LmgcU1JGVFMveSkpwd38yiDyG4D6QZPXbEA5DHmYOpyanifalHR+E8sl/5bWY0GcOpS3MetWQeO6QZUSqIDRD254vUblMOg2eS/ZksxXEcE+a4+vcriagnWB2F9ppxRBhvFSPyrWeVy4w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=TlnmFjtn; arc=none smtp.client-ip=198.175.65.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="TlnmFjtn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1734762689; x=1766298689; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=KPv/lIOr9UJuu1TDwAGjapkWxba0uS6X9GnVkLeTgfc=; b=TlnmFjtn8LsdEnX4WjcjjREbR4uvbd7UOp9bosxA/YpbJLz/llgpJVF/ h98TnDv5MPouF48G8o9/PUuVW3lLq3Pzkf3pU5/Pswjt25VsJG1eVHhhb QlLjqHtS3KdVwMnHjoMTw7Uqd59VLvcFTJU2IVsEYf5Mu6F2kC1AN/9Yv jrQYNiuHEkyFteADCPNT5I8P2kGHsquiQfx8dALIYJEbDyV9DcCv1m6sy UDolzYlr8OtIwTowbu7sH8ToMIvoI4Y25sQKyLJPxdmKtlljJGKJekOm5 TrIVZOaT9rpwupf5yFJSQRlARQDeteGYNNJwlxpjhmtVR0x1tL1ke7Z4l A==; X-CSE-ConnectionGUID: NrgutftuTUS3Fyy/QVOZow== X-CSE-MsgGUID: vAdh1tWIQPKAdPiI7pgDOg== X-IronPort-AV: E=McAfee;i="6700,10204,11292"; a="35021719" X-IronPort-AV: E=Sophos;i="6.12,253,1728975600"; d="scan'208";a="35021719" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Dec 2024 22:31:21 -0800 X-CSE-ConnectionGUID: 7G/EcktGThmli+QGpElkYQ== X-CSE-MsgGUID: M7yZhvoTT6i5+xSQGaVIsA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="99184607" Received: from jf5300-b11a338t.jf.intel.com ([10.242.51.115]) by orviesa007.jf.intel.com with ESMTP; 20 Dec 2024 22:31:21 -0800 From: Kanchana P Sridhar To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hannes@cmpxchg.org, yosryahmed@google.com, nphamcs@gmail.com, chengming.zhou@linux.dev, usamaarif642@gmail.com, ryan.roberts@arm.com, 21cnbao@gmail.com, akpm@linux-foundation.org, linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net, clabbe@baylibre.com, ardb@kernel.org, ebiggers@google.com, surenb@google.com, kristen.c.accardi@intel.com Cc: wajdi.k.feghali@intel.com, vinodh.gopal@intel.com, kanchana.p.sridhar@intel.com Subject: [PATCH v5 10/12] mm: zswap: Allocate pool batching resources if the crypto_alg supports batching. Date: Fri, 20 Dec 2024 22:31:17 -0800 Message-Id: <20241221063119.29140-11-kanchana.p.sridhar@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20241221063119.29140-1-kanchana.p.sridhar@intel.com> References: <20241221063119.29140-1-kanchana.p.sridhar@intel.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This patch does the following: 1) Defines ZSWAP_MAX_BATCH_SIZE to denote the maximum number of acomp_ctx batching resources (acomp_reqs and buffers) to allocate if the zswap compressor supports batching. Currently, ZSWAP_MAX_BATCH_SIZE is set to 8U. 2) Modifies the definition of "struct crypto_acomp_ctx" to represent a configurable number of acomp_reqs and buffers. Adds a "nr_reqs" to "struct crypto_acomp_ctx" to contain the number of resources that will be allocated in the cpu hotplug onlining code. 3) The zswap_cpu_comp_prepare() cpu onlining code will detect if the crypto_acomp created for the zswap pool (in other words, the zswap compression algorithm) has registered implementations for batch_compress() and batch_decompress(). If so, it will query the crypto_acomp for the maximum batch size supported by the compressor, and set "nr_reqs" to the minimum of this compressor-specific max batch size and ZSWAP_MAX_BATCH_SIZE. Finally, it will allocate "nr_reqs" reqs/buffers, and set the acomp_ctx->nr_reqs accordingly. 4) If the crypto_acomp does not support batching, "nr_reqs" defaults to 1. Signed-off-by: Kanchana P Sridhar --- mm/zswap.c | 122 +++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 90 insertions(+), 32 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index 9718c33f8192..99cd78891fd0 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -78,6 +78,13 @@ static bool zswap_pool_reached_full; #define ZSWAP_PARAM_UNSET "" +/* + * For compression batching of large folios: + * Maximum number of acomp compress requests that will be processed + * in a batch, iff the zswap compressor supports batching. + */ +#define ZSWAP_MAX_BATCH_SIZE 8U + static int zswap_setup(void); /* Enable/disable zswap */ @@ -143,9 +150,10 @@ bool zswap_never_enabled(void) struct crypto_acomp_ctx { struct crypto_acomp *acomp; - struct acomp_req *req; + struct acomp_req **reqs; + u8 **buffers; + unsigned int nr_reqs; struct crypto_wait wait; - u8 *buffer; struct mutex mutex; bool is_sleepable; }; @@ -818,49 +826,88 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node) struct zswap_pool *pool = hlist_entry(node, struct zswap_pool, node); struct crypto_acomp_ctx *acomp_ctx = per_cpu_ptr(pool->acomp_ctx, cpu); struct crypto_acomp *acomp; - struct acomp_req *req; - int ret; + unsigned int nr_reqs = 1; + int ret = -ENOMEM; + int i, j; mutex_init(&acomp_ctx->mutex); - - acomp_ctx->buffer = kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, cpu_to_node(cpu)); - if (!acomp_ctx->buffer) - return -ENOMEM; + acomp_ctx->nr_reqs = 0; acomp = crypto_alloc_acomp_node(pool->tfm_name, 0, 0, cpu_to_node(cpu)); if (IS_ERR(acomp)) { pr_err("could not alloc crypto acomp %s : %ld\n", pool->tfm_name, PTR_ERR(acomp)); - ret = PTR_ERR(acomp); - goto acomp_fail; + return PTR_ERR(acomp); } acomp_ctx->acomp = acomp; acomp_ctx->is_sleepable = acomp_is_async(acomp); - req = acomp_request_alloc(acomp_ctx->acomp); - if (!req) { - pr_err("could not alloc crypto acomp_request %s\n", - pool->tfm_name); - ret = -ENOMEM; + /* + * Create the necessary batching resources if the crypto acomp alg + * implements the batch_compress and batch_decompress API. + */ + if (acomp_has_async_batching(acomp)) { + nr_reqs = min(ZSWAP_MAX_BATCH_SIZE, crypto_acomp_batch_size(acomp)); + pr_info_once("Creating acomp_ctx with %d reqs/buffers for batching since crypto acomp\n%s has registered batch_compress() and batch_decompress().\n", + nr_reqs, pool->tfm_name); + } + + acomp_ctx->buffers = kmalloc_node(nr_reqs * sizeof(u8 *), GFP_KERNEL, cpu_to_node(cpu)); + if (!acomp_ctx->buffers) + goto buf_fail; + + for (i = 0; i < nr_reqs; ++i) { + acomp_ctx->buffers[i] = kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, cpu_to_node(cpu)); + if (!acomp_ctx->buffers[i]) { + for (j = 0; j < i; ++j) + kfree(acomp_ctx->buffers[j]); + kfree(acomp_ctx->buffers); + ret = -ENOMEM; + goto buf_fail; + } + } + + acomp_ctx->reqs = kmalloc_node(nr_reqs * sizeof(struct acomp_req *), GFP_KERNEL, cpu_to_node(cpu)); + if (!acomp_ctx->reqs) goto req_fail; + + for (i = 0; i < nr_reqs; ++i) { + acomp_ctx->reqs[i] = acomp_request_alloc(acomp_ctx->acomp); + if (!acomp_ctx->reqs[i]) { + pr_err("could not alloc crypto acomp_request reqs[%d] %s\n", + i, pool->tfm_name); + for (j = 0; j < i; ++j) + acomp_request_free(acomp_ctx->reqs[j]); + kfree(acomp_ctx->reqs); + ret = -ENOMEM; + goto req_fail; + } } - acomp_ctx->req = req; + /* + * The crypto_wait is used only in fully synchronous, i.e., with scomp + * or non-poll mode of acomp, hence there is only one "wait" per + * acomp_ctx, with callback set to reqs[0], under the assumption that + * there is at least 1 request per acomp_ctx. + */ crypto_init_wait(&acomp_ctx->wait); /* * if the backend of acomp is async zip, crypto_req_done() will wakeup * crypto_wait_req(); if the backend of acomp is scomp, the callback * won't be called, crypto_wait_req() will return without blocking. */ - acomp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, + acomp_request_set_callback(acomp_ctx->reqs[0], CRYPTO_TFM_REQ_MAY_BACKLOG, crypto_req_done, &acomp_ctx->wait); + acomp_ctx->nr_reqs = nr_reqs; return 0; req_fail: + for (i = 0; i < nr_reqs; ++i) + kfree(acomp_ctx->buffers[i]); + kfree(acomp_ctx->buffers); +buf_fail: crypto_free_acomp(acomp_ctx->acomp); -acomp_fail: - kfree(acomp_ctx->buffer); return ret; } @@ -870,11 +917,22 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node) struct crypto_acomp_ctx *acomp_ctx = per_cpu_ptr(pool->acomp_ctx, cpu); if (!IS_ERR_OR_NULL(acomp_ctx)) { - if (!IS_ERR_OR_NULL(acomp_ctx->req)) - acomp_request_free(acomp_ctx->req); + int i; + + for (i = 0; i < acomp_ctx->nr_reqs; ++i) + if (!IS_ERR_OR_NULL(acomp_ctx->reqs[i])) + acomp_request_free(acomp_ctx->reqs[i]); + kfree(acomp_ctx->reqs); + + for (i = 0; i < acomp_ctx->nr_reqs; ++i) + kfree(acomp_ctx->buffers[i]); + kfree(acomp_ctx->buffers); + if (!IS_ERR_OR_NULL(acomp_ctx->acomp)) crypto_free_acomp(acomp_ctx->acomp); - kfree(acomp_ctx->buffer); + + acomp_ctx->nr_reqs = 0; + acomp_ctx = NULL; } return 0; @@ -897,7 +955,7 @@ static bool zswap_compress(struct page *page, struct zswap_entry *entry, mutex_lock(&acomp_ctx->mutex); - dst = acomp_ctx->buffer; + dst = acomp_ctx->buffers[0]; sg_init_table(&input, 1); sg_set_page(&input, page, PAGE_SIZE, 0); @@ -907,7 +965,7 @@ static bool zswap_compress(struct page *page, struct zswap_entry *entry, * giving the dst buffer with enough length to avoid buffer overflow. */ sg_init_one(&output, dst, PAGE_SIZE * 2); - acomp_request_set_params(acomp_ctx->req, &input, &output, PAGE_SIZE, dlen); + acomp_request_set_params(acomp_ctx->reqs[0], &input, &output, PAGE_SIZE, dlen); /* * it maybe looks a little bit silly that we send an asynchronous request, @@ -921,8 +979,8 @@ static bool zswap_compress(struct page *page, struct zswap_entry *entry, * but in different threads running on different cpu, we have different * acomp instance, so multiple threads can do (de)compression in parallel. */ - comp_ret = crypto_wait_req(crypto_acomp_compress(acomp_ctx->req), &acomp_ctx->wait); - dlen = acomp_ctx->req->dlen; + comp_ret = crypto_wait_req(crypto_acomp_compress(acomp_ctx->reqs[0]), &acomp_ctx->wait); + dlen = acomp_ctx->reqs[0]->dlen; if (comp_ret) goto unlock; @@ -975,20 +1033,20 @@ static void zswap_decompress(struct zswap_entry *entry, struct folio *folio) */ if ((acomp_ctx->is_sleepable && !zpool_can_sleep_mapped(zpool)) || !virt_addr_valid(src)) { - memcpy(acomp_ctx->buffer, src, entry->length); - src = acomp_ctx->buffer; + memcpy(acomp_ctx->buffers[0], src, entry->length); + src = acomp_ctx->buffers[0]; zpool_unmap_handle(zpool, entry->handle); } sg_init_one(&input, src, entry->length); sg_init_table(&output, 1); sg_set_folio(&output, folio, PAGE_SIZE, 0); - acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, PAGE_SIZE); - BUG_ON(crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait)); - BUG_ON(acomp_ctx->req->dlen != PAGE_SIZE); + acomp_request_set_params(acomp_ctx->reqs[0], &input, &output, entry->length, PAGE_SIZE); + BUG_ON(crypto_wait_req(crypto_acomp_decompress(acomp_ctx->reqs[0]), &acomp_ctx->wait)); + BUG_ON(acomp_ctx->reqs[0]->dlen != PAGE_SIZE); mutex_unlock(&acomp_ctx->mutex); - if (src != acomp_ctx->buffer) + if (src != acomp_ctx->buffers[0]) zpool_unmap_handle(zpool, entry->handle); }