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AJvYcCUoPilh/j3il++8x/aM5Jx/3oEK63zsBP7p9x3ZA7XqZ8mS9dhAArvT+viR872gUeD1WZVW0fqqVH0KYmGcGJDej6L1uhS5jJnS0/hvlcsc4mnIADc5+/7s4Gr0Eajgl4njYoxMxlYkCMkc X-Gm-Message-State: AOJu0YwmO9H0cM0ovuKrS5RA65sDrh+8QGuKeyOoEyZSjeg/6nH07OLh cKTAyojN1zDThOQ1ynxUCQFau2RmX0SkgLSsGdDt+Mz/L+ttbsX0 X-Received: by 2002:a05:6e02:13e2:b0:363:c63a:7975 with SMTP id w2-20020a056e0213e200b00363c63a7975mr6639713ilj.24.1708145500701; Fri, 16 Feb 2024 20:51:40 -0800 (PST) Received: from barry-desktop.hub ([2407:7000:8942:5500:e82e:22f2:1bdb:989f]) by smtp.gmail.com with ESMTPSA id n14-20020a635c4e000000b005dc2ca5b667sm610703pgm.10.2024.02.16.20.51.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Feb 2024 20:51:40 -0800 (PST) From: Barry Song <21cnbao@gmail.com> To: akpm@linux-foundation.org, davem@davemloft.net, hannes@cmpxchg.org, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-mm@kvack.org, nphamcs@gmail.com, yosryahmed@google.com, zhouchengming@bytedance.com Cc: chriscli@google.com, chrisl@kernel.org, ddstreet@ieee.org, linux-kernel@vger.kernel.org, sjenning@redhat.com, vitaly.wool@konsulko.com, Barry Song Subject: [PATCH v3 3/3] crypto: scompress: remove memcpy if sg_nents is 1 Date: Sat, 17 Feb 2024 17:51:02 +1300 Message-Id: <20240217045102.55339-4-21cnbao@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240217045102.55339-1-21cnbao@gmail.com> References: <20240217045102.55339-1-21cnbao@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791120417739166971 X-GMAIL-MSGID: 1791120417739166971 From: Barry Song while sg_nents is 1 which is always true for the current kernel as the only user - zswap is the case, we should remove two big memcpy. Signed-off-by: Barry Song Tested-by: Chengming Zhou --- crypto/scompress.c | 36 +++++++++++++++++++++++++++++------- 1 file changed, 29 insertions(+), 7 deletions(-) diff --git a/crypto/scompress.c b/crypto/scompress.c index b108a30a7600..50a487eac792 100644 --- a/crypto/scompress.c +++ b/crypto/scompress.c @@ -117,6 +117,7 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir) struct crypto_scomp *scomp = *tfm_ctx; void **ctx = acomp_request_ctx(req); struct scomp_scratch *scratch; + void *src, *dst; unsigned int dlen; int ret; @@ -134,13 +135,25 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir) scratch = raw_cpu_ptr(&scomp_scratch); spin_lock(&scratch->lock); - scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0); + if (sg_nents(req->src) == 1) { + src = kmap_local_page(sg_page(req->src)) + req->src->offset; + } else { + scatterwalk_map_and_copy(scratch->src, req->src, 0, + req->slen, 0); + src = scratch->src; + } + + if (req->dst && sg_nents(req->dst) == 1) + dst = kmap_local_page(sg_page(req->dst)) + req->dst->offset; + else + dst = scratch->dst; + if (dir) - ret = crypto_scomp_compress(scomp, scratch->src, req->slen, - scratch->dst, &req->dlen, *ctx); + ret = crypto_scomp_compress(scomp, src, req->slen, + dst, &req->dlen, *ctx); else - ret = crypto_scomp_decompress(scomp, scratch->src, req->slen, - scratch->dst, &req->dlen, *ctx); + ret = crypto_scomp_decompress(scomp, src, req->slen, + dst, &req->dlen, *ctx); if (!ret) { if (!req->dst) { req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL); @@ -152,10 +165,19 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir) ret = -ENOSPC; goto out; } - scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen, - 1); + if (dst == scratch->dst) { + scatterwalk_map_and_copy(scratch->dst, req->dst, 0, + req->dlen, 1); + } else { + flush_dcache_page(sg_page(req->dst)); + } } out: + if (src != scratch->src) + kunmap_local(src); + if (dst != scratch->dst) + kunmap_local(dst); + spin_unlock(&scratch->lock); return ret; }