From nobody Wed Dec 17 07:31:27 2025 Received: from mail-pg1-f178.google.com (mail-pg1-f178.google.com [209.85.215.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 06A767D419 for ; Wed, 8 May 2024 07:43:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715154200; cv=none; b=hSux0uXzT3fG2xKTr9tbMa2rbsg13/fMXuhopJXAA2Zd1f81FgNoCKVBPc9lPoR4JQu2Nhs+RmuoUNF5Tv0jhm5mqf/UGijrULs9GfjMBWJjW65+4+7aeWKucz//S3Na1H7l3OynZclG9L7TZNk5/U1WIhjry4O7cXpSjrSZQBo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715154200; c=relaxed/simple; bh=cIuDRIJ4nUfk74gqjSPgbW11lj17tju3W5di3bnGXlI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k9S9zyuGajempKzeXXrqTMvCcsvZBqNFUMnjc+NgAwKrlMM2+eZLE5V04F1Oks1WldhfnkPvuZAdxXTsO8UvCJvXbg8uzNe2pvxDCtat4vhVi1Q92PxRufbsOUmCEuXcNIOIiHxwe0JM1v6ei5HkelmB/u/NszaHg7XsRgBEJp0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=BklmlNhU; arc=none smtp.client-ip=209.85.215.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="BklmlNhU" Received: by mail-pg1-f178.google.com with SMTP id 41be03b00d2f7-5dca1efad59so3173985a12.2 for ; Wed, 08 May 2024 00:43:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1715154198; x=1715758998; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=aM4w/1Tu/L1seDE9eZUHI5/Rr3RZ+Tacd81KpjjZOe8=; b=BklmlNhUbOHzYIwk5uFuRWHwsCkrhaPL1t9eZjF6jIR/z6721CLZJoIlT5yO3IQgJs FSmFsFRXWOmjqfCce2GaSJHPzwcCoh8FHGCXl/R17BdxwiFU1N9bhyeZ4JeZ/Kh5fG4J PiPJVvlEgtZfjebR+C/SGFJ0YS5zCnZdhsjm4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715154198; x=1715758998; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=aM4w/1Tu/L1seDE9eZUHI5/Rr3RZ+Tacd81KpjjZOe8=; b=B0SczKMlbSTPaqyESKjQ7qYFe6TvUzIO/2aCZzN/66HAWesS+rjUI6jRnE2YiZ3eKn 70Ku+FksEzgzDzlQ1luBWBMVMZTDOca+Ylidrb5aRupupQTEHuwV77S4/r8w6J5u+0mh 8E8w0fdw/pTI7NAQmxDVlLqM5mp3D348ce/bNnirKpqPwFGl3QgonqFPiloYlguZwFER idM3Jx7pTzMHzX7bghOiMzx2TKb0IM8D4KNsmG4SRHlRjTcx+uGXNabhRNP/M16MmQoY k060KSDW30ZaWrCvn6gJC+0m+8/p8AEUpXxb8UvbeKko/9+gIJ7/Z2tzk8NNODbtAdGQ AUWw== X-Gm-Message-State: AOJu0YyJWt/Vnyyzsn9AUDV5ILlm4ZtzWrq4xUCyv6hHIzI1X3kBayWn qpmkdVYpZQfxrF0MGoSfrs6V2Z6dyYlDy41BQoE3eXr1SzTTUy+ULW9NHY6hAw== X-Google-Smtp-Source: AGHT+IHEfuikcLcEdzIHPVyHM4RdbcbRmnsyhBsB7pjK11xJlOMqxiCR+jIEf8xqbF0MBD0Ty2IxqA== X-Received: by 2002:a17:90a:f008:b0:2b6:208b:ca8e with SMTP id 98e67ed59e1d1-2b6208bcdc3mr1083278a91.30.1715154198462; Wed, 08 May 2024 00:43:18 -0700 (PDT) Received: from tigerii.tok.corp.google.com ([2401:fa00:8f:203:ad4d:5f6c:6699:2da4]) by smtp.gmail.com with ESMTPSA id l5-20020a17090aec0500b002b328adaa40sm780011pjy.17.2024.05.08.00.43.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 May 2024 00:43:18 -0700 (PDT) From: Sergey Senozhatsky To: Andrew Morton , Minchan Kim Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Sergey Senozhatsky Subject: [PATCHv3 17/19] zram: add dictionary support to lz4 Date: Wed, 8 May 2024 16:42:10 +0900 Message-ID: <20240508074223.652784-18-senozhatsky@chromium.org> X-Mailer: git-send-email 2.45.0.rc1.225.g2a3ae87e7f-goog In-Reply-To: <20240508074223.652784-1-senozhatsky@chromium.org> References: <20240508074223.652784-1-senozhatsky@chromium.org> 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" Support pre-trained dictionary param. lz4 doesn't mandate specific format of the dictionary and even zstd --train can be used to train a dictionary for lz4, according to [1]. TEST =3D=3D=3D=3D - default lz4 /sys/block/zram0/mm_stat 1750323200 664258735 676990976 0 676990976 2 0 3428= 8 34288 - lz4 dict=3D/etc/dictionary /sys/block/zram0/mm_stat 1750310912 620608254 632852480 0 632852480 1 0 3428= 8 34288 [1] https://github.com/lz4/lz4/issues/557 Signed-off-by: Sergey Senozhatsky --- drivers/block/zram/backend_lz4.c | 77 +++++++++++++++++++++++++++++--- 1 file changed, 71 insertions(+), 6 deletions(-) diff --git a/drivers/block/zram/backend_lz4.c b/drivers/block/zram/backend_= lz4.c index 560fcf139301..2c3b64058adf 100644 --- a/drivers/block/zram/backend_lz4.c +++ b/drivers/block/zram/backend_lz4.c @@ -1,9 +1,20 @@ #include #include +#include #include =20 #include "backend_lz4.h" =20 +struct lz4_ctx { + void *mem; + LZ4_streamDecode_t *dstrm; + LZ4_stream_t *cstrm; + + /* Shared between C/D streams */ + void *dict; + size_t dict_sz; +}; + static int lz4_init_config(struct zcomp_config *config) { return 0; @@ -13,22 +24,65 @@ static void lz4_release_config(struct zcomp_config *con= fig) { } =20 -static void *lz4_create(struct zcomp_config *config) +static void lz4_destroy(void *ctx) { - return vmalloc(LZ4_MEM_COMPRESS); + struct lz4_ctx *zctx =3D ctx; + + kfree(zctx->dstrm); + kfree(zctx->cstrm); + vfree(zctx->mem); + kfree(zctx); } =20 -static void lz4_destroy(void *ctx) +static void *lz4_create(struct zcomp_config *config) { - vfree(ctx); + struct lz4_ctx *ctx; + + ctx =3D kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return NULL; + + if (!config->dict) { + ctx->mem =3D vmalloc(LZ4_MEM_COMPRESS); + if (!ctx->mem) + goto error; + } else { + ctx->dstrm =3D kzalloc(sizeof(*ctx->dstrm), GFP_KERNEL); + if (!ctx->dstrm) + goto error; + + ctx->cstrm =3D kzalloc(sizeof(*ctx->cstrm), GFP_KERNEL); + if (!ctx->cstrm) + goto error; + + ctx->dict =3D config->dict; + ctx->dict_sz =3D config->dict_sz; + } + + return ctx; +error: + lz4_destroy(ctx); + return NULL; } =20 static int lz4_compress(void *ctx, const unsigned char *src, unsigned char *dst, size_t *dst_len) { + struct lz4_ctx *zctx =3D ctx; int ret; =20 - ret =3D LZ4_compress_default(src, dst, PAGE_SIZE, *dst_len, ctx); + if (!zctx->cstrm) { + ret =3D LZ4_compress_default(src, dst, PAGE_SIZE, *dst_len, + zctx->mem); + } else { + /* Cstrm needs to be reset */ + ret =3D LZ4_loadDict(zctx->cstrm, zctx->dict, zctx->dict_sz); + if (ret !=3D zctx->dict_sz) + return -EINVAL; + ret =3D LZ4_compress_fast_continue(zctx->cstrm, src, dst, + PAGE_SIZE, *dst_len, + LZ4_ACCELERATION_DEFAULT); + } if (!ret) return -EINVAL; *dst_len =3D ret; @@ -38,10 +92,21 @@ static int lz4_compress(void *ctx, const unsigned char = *src, static int lz4_decompress(void *ctx, const unsigned char *src, size_t src_len, unsigned char *dst) { + struct lz4_ctx *zctx =3D ctx; int dst_len =3D PAGE_SIZE; int ret; =20 - ret =3D LZ4_decompress_safe(src, dst, src_len, dst_len); + if (!zctx->dstrm) { + ret =3D LZ4_decompress_safe(src, dst, src_len, dst_len); + } else { + /* Dstrm needs to be reset */ + ret =3D LZ4_setStreamDecode(zctx->dstrm, zctx->dict, + zctx->dict_sz); + if (!ret) + return -EINVAL; + ret =3D LZ4_decompress_safe_continue(zctx->dstrm, src, dst, + src_len, dst_len); + } if (ret < 0) return -EINVAL; return 0; --=20 2.45.0.rc1.225.g2a3ae87e7f-goog