From nobody Tue Dec 16 05:58:00 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) (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 A58431F130C; Mon, 3 Mar 2025 08:47:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.14 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740991666; cv=none; b=TG0jEB7PH6NjUE6TBeM4kTTYPXGBmCmkLbrks8f76pymuy+1+sU8goPgVUBKZfkOFATN2aITUSTbHRka57mKZpziUv4bsrVX+kv84R3/YoSSu2LLk3DSZGC4y6tdtTfs7CFxHYOuHj3c+OU9QJmeA24IJlPJOmqef1ibvV+nnxM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740991666; c=relaxed/simple; bh=mzM5ALTaJ0aweiEptVLygcT+eKuMHDddBO1cMIOmY5c=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nDi5o6rLMuDc4m0fns7tE2zE03l/Lcm23YaltNxVe6jVqe2QELuDNjGmfLzsp1B9rR3dJEnxtt1cbt3rbZjmCXv03KgUPvDARBBOWWFKa2uDcD8cBrhyQl8UH4LRohZr5iEMX3TvxzV4Y4obOejhkMOHaqzfPajW4NoeaT0lnyE= 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=m1B/AgcL; arc=none smtp.client-ip=192.198.163.14 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="m1B/AgcL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1740991665; x=1772527665; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=mzM5ALTaJ0aweiEptVLygcT+eKuMHDddBO1cMIOmY5c=; b=m1B/AgcLtUhvYbpJE1+UVl1vgFgConOvdEPX1imXuGUpeLb6kjCDhOFK 5qoSNwf60Ju1coNTezJl4ixH0KdGfvz7bZtdcVurzfPNd51VuP1IYULsa L2/SsVyvE/F2WJFGtmzHLzTZNGU4cU7jVSmHsTOOKApIK7FHQu9iNhqmw mFmvWnaCT5IfoaVGG55KxInTrrR4rS0U8GdaBpiMv6VcROKONPJJQtAiZ A5uu5DifFBPffwpVYLKKKTft2b298y6srS8HO1eXgi22mK0NRHVf/DdmC hRVblSDY6yMhIAN1mZ5UeuA39EPU7YfQryuHMg3QFCLg/w+BMv6KbochF A==; X-CSE-ConnectionGUID: WwZyvSgxT66VPjEjUhmlVg== X-CSE-MsgGUID: DZLNIhyPSXul57FF91Ppxw== X-IronPort-AV: E=McAfee;i="6700,10204,11361"; a="42112018" X-IronPort-AV: E=Sophos;i="6.13,329,1732608000"; d="scan'208";a="42112018" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2025 00:47:40 -0800 X-CSE-ConnectionGUID: ehvg2B31TRqs9zpVgL56/w== X-CSE-MsgGUID: pKsO428nSeatt0KiCUhTdQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,329,1732608000"; d="scan'208";a="118426829" Received: from jf5300-b11a338t.jf.intel.com ([10.242.51.115]) by fmviesa010.fm.intel.com with ESMTP; 03 Mar 2025 00:47:38 -0800 From: Kanchana P Sridhar To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hannes@cmpxchg.org, yosry.ahmed@linux.dev, nphamcs@gmail.com, chengming.zhou@linux.dev, usamaarif642@gmail.com, ryan.roberts@arm.com, 21cnbao@gmail.com, ying.huang@linux.alibaba.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 v8 13/14] mm: zswap: Allocate pool batching resources if the compressor supports batching. Date: Mon, 3 Mar 2025 00:47:23 -0800 Message-Id: <20250303084724.6490-14-kanchana.p.sridhar@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20250303084724.6490-1-kanchana.p.sridhar@intel.com> References: <20250303084724.6490-1-kanchana.p.sridhar@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This patch adds support for the per-CPU acomp_ctx to track multiple compression/decompression requests and multiple compression destination buffers. The zswap_cpu_comp_prepare() CPU onlining code will get the maximum batch-size the compressor supports. If so, it will allocate the necessary batching resources. However, zswap does not use more than one request yet. Follow-up patches will actually utilize the multiple acomp_ctx requests/buffers for batch compression/decompression of multiple pages. The newly added ZSWAP_MAX_BATCH_SIZE limits the amount of extra memory used for batching. There is a small extra memory overhead of allocating the "reqs" and "buffers" arrays for compressors that do not support batching. Signed-off-by: Kanchana P Sridhar --- mm/zswap.c | 99 +++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 69 insertions(+), 30 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index cff96df1df8b..fae59d6d5147 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -78,6 +78,16 @@ static bool zswap_pool_reached_full; =20 #define ZSWAP_PARAM_UNSET "" =20 +/* + * 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. + * This limit exists because we preallocate enough requests and buffers + * in the per-cpu acomp_ctx accordingly. Hence, a higher limit means higher + * memory usage. + */ +#define ZSWAP_MAX_BATCH_SIZE 8U + static int zswap_setup(void); =20 /* Enable/disable zswap */ @@ -143,8 +153,8 @@ bool zswap_never_enabled(void) =20 struct crypto_acomp_ctx { struct crypto_acomp *acomp; - struct acomp_req *req; - u8 *buffer; + struct acomp_req **reqs; + u8 **buffers; u8 nr_reqs; struct crypto_wait wait; struct mutex mutex; @@ -251,13 +261,22 @@ static void __zswap_pool_empty(struct percpu_ref *ref= ); static void acomp_ctx_dealloc(struct crypto_acomp_ctx *acomp_ctx) { if (!IS_ERR_OR_NULL(acomp_ctx) && acomp_ctx->nr_reqs) { + u8 i; + + if (acomp_ctx->reqs) { + for (i =3D 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); + acomp_ctx->reqs =3D NULL; + } =20 - if (!IS_ERR_OR_NULL(acomp_ctx->req)) - acomp_request_free(acomp_ctx->req); - acomp_ctx->req =3D NULL; - - kfree(acomp_ctx->buffer); - acomp_ctx->buffer =3D NULL; + if (acomp_ctx->buffers) { + for (i =3D 0; i < acomp_ctx->nr_reqs; ++i) + kfree(acomp_ctx->buffers[i]); + kfree(acomp_ctx->buffers); + acomp_ctx->buffers =3D NULL; + } =20 if (!IS_ERR_OR_NULL(acomp_ctx->acomp)) crypto_free_acomp(acomp_ctx->acomp); @@ -271,6 +290,7 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, str= uct hlist_node *node) struct zswap_pool *pool =3D hlist_entry(node, struct zswap_pool, node); struct crypto_acomp_ctx *acomp_ctx =3D per_cpu_ptr(pool->acomp_ctx, cpu); int ret =3D -ENOMEM; + u8 i; =20 /* * Just to be even more fail-safe against changes in assumptions and/or @@ -292,22 +312,41 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, s= truct hlist_node *node) goto fail; } =20 - acomp_ctx->nr_reqs =3D 1; + acomp_ctx->nr_reqs =3D min(ZSWAP_MAX_BATCH_SIZE, + crypto_acomp_batch_size(acomp_ctx->acomp)); =20 - acomp_ctx->req =3D acomp_request_alloc(acomp_ctx->acomp); - if (!acomp_ctx->req) { - pr_err("could not alloc crypto acomp_request %s\n", - pool->tfm_name); - ret =3D -ENOMEM; + acomp_ctx->reqs =3D kcalloc_node(acomp_ctx->nr_reqs, sizeof(struct acomp_= req *), + GFP_KERNEL, cpu_to_node(cpu)); + if (!acomp_ctx->reqs) goto fail; + + for (i =3D 0; i < acomp_ctx->nr_reqs; ++i) { + acomp_ctx->reqs[i] =3D 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); + goto fail; + } } =20 - acomp_ctx->buffer =3D kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, cpu_to_node= (cpu)); - if (!acomp_ctx->buffer) { - ret =3D -ENOMEM; + acomp_ctx->buffers =3D kcalloc_node(acomp_ctx->nr_reqs, sizeof(u8 *), + GFP_KERNEL, cpu_to_node(cpu)); + if (!acomp_ctx->buffers) goto fail; + + for (i =3D 0; i < acomp_ctx->nr_reqs; ++i) { + acomp_ctx->buffers[i] =3D kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, + cpu_to_node(cpu)); + if (!acomp_ctx->buffers[i]) + goto fail; } =20 + /* + * 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); =20 /* @@ -315,7 +354,7 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, str= uct hlist_node *node) * 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(acomp_ctx->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); =20 acomp_ctx->is_sleepable =3D acomp_is_async(acomp_ctx->acomp); @@ -407,8 +446,8 @@ static struct zswap_pool *zswap_pool_create(char *type,= char *compressor) struct crypto_acomp_ctx *acomp_ctx =3D per_cpu_ptr(pool->acomp_ctx, cpu); =20 acomp_ctx->acomp =3D NULL; - acomp_ctx->req =3D NULL; - acomp_ctx->buffer =3D NULL; + acomp_ctx->reqs =3D NULL; + acomp_ctx->buffers =3D NULL; acomp_ctx->__online =3D false; acomp_ctx->nr_reqs =3D 0; mutex_init(&acomp_ctx->mutex); @@ -1026,7 +1065,7 @@ static bool zswap_compress(struct page *page, struct = zswap_entry *entry, u8 *dst; =20 acomp_ctx =3D acomp_ctx_get_cpu_lock(pool); - dst =3D acomp_ctx->buffer; + dst =3D acomp_ctx->buffers[0]; sg_init_table(&input, 1); sg_set_page(&input, page, PAGE_SIZE, 0); =20 @@ -1036,7 +1075,7 @@ 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); =20 /* * it maybe looks a little bit silly that we send an asynchronous request, @@ -1050,8 +1089,8 @@ 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 =3D crypto_wait_req(crypto_acomp_compress(acomp_ctx->req), &acom= p_ctx->wait); - dlen =3D acomp_ctx->req->dlen; + comp_ret =3D crypto_wait_req(crypto_acomp_compress(acomp_ctx->reqs[0]), &= acomp_ctx->wait); + dlen =3D acomp_ctx->reqs[0]->dlen; if (comp_ret) goto unlock; =20 @@ -1102,19 +1141,19 @@ static void zswap_decompress(struct zswap_entry *en= try, 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 =3D acomp_ctx->buffer; + memcpy(acomp_ctx->buffers[0], src, entry->length); + src =3D acomp_ctx->buffers[0]; zpool_unmap_handle(zpool, entry->handle); } =20 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_ct= x->wait)); - BUG_ON(acomp_ctx->req->dlen !=3D PAGE_SIZE); + acomp_request_set_params(acomp_ctx->reqs[0], &input, &output, entry->leng= th, PAGE_SIZE); + BUG_ON(crypto_wait_req(crypto_acomp_decompress(acomp_ctx->reqs[0]), &acom= p_ctx->wait)); + BUG_ON(acomp_ctx->reqs[0]->dlen !=3D PAGE_SIZE); =20 - if (src !=3D acomp_ctx->buffer) + if (src !=3D acomp_ctx->buffers[0]) zpool_unmap_handle(zpool, entry->handle); acomp_ctx_put_unlock(acomp_ctx); } --=20 2.27.0