{"id":26226,"url":"https://patchwork.libcamera.org/api/patches/26226/?format=json","web_url":"https://patchwork.libcamera.org/patch/26226/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260223160930.27913-2-johannes.goede@oss.qualcomm.com>","date":"2026-02-23T16:09:27","name":"[v2,1/4] software_isp: swstats_cpu: Prepare for multi-threading support","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"842f9bbcb2ad11ee97180241b54704d5223e2ba6","submitter":{"id":242,"url":"https://patchwork.libcamera.org/api/people/242/?format=json","name":"Hans de Goede","email":"johannes.goede@oss.qualcomm.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/26226/mbox/","series":[{"id":5809,"url":"https://patchwork.libcamera.org/api/series/5809/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5809","date":"2026-02-23T16:09:27","name":"software_isp: debayer_cpu: Add multi-threading support","version":2,"mbox":"https://patchwork.libcamera.org/series/5809/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/26226/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/26226/checks/","tags":{},"headers":{"Return-Path":"<libcamera-devel-bounces@lists.libcamera.org>","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 09C29BE175\n\tfor <parsemail@patchwork.libcamera.org>;\n\tMon, 23 Feb 2026 16:09:39 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 061E462293;\n\tMon, 23 Feb 2026 17:09:38 +0100 (CET)","from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com\n\t[205.220.180.131])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 94063621CE\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 23 Feb 2026 17:09:36 +0100 (CET)","from pps.filterd (m0279868.ppops.net [127.0.0.1])\n\tby mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n\t61NAX3F33698602 for <libcamera-devel@lists.libcamera.org>;\n\tMon, 23 Feb 2026 16:09:35 GMT","from mail-vs1-f70.google.com (mail-vs1-f70.google.com\n\t[209.85.217.70])\n\tby mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4cgn8191e0-1\n\t(version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT)\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 23 Feb 2026 16:09:35 +0000 (GMT)","by mail-vs1-f70.google.com with SMTP id\n\tada2fe7eead31-5fdede3f1ceso65109217137.1\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 23 Feb 2026 08:09:35 -0800 (PST)","from t14s.vakwerkhuis.com ([78.108.130.194])\n\tby smtp.gmail.com with ESMTPSA id\n\ta640c23a62f3a-b9084c60b91sm338284066b.14.2026.02.23.08.09.32\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tMon, 23 Feb 2026 08:09:33 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tMon, 23 Feb 2026 08:09:34 -0800 (PST)","by 2002:a05:6102:dca:b0:5f7:24e9:6e91 with SMTP id\n\tada2fe7eead31-5feb30faaebmr4985314137.36.1771862973768; \n\tMon, 23 Feb 2026 08:09:33 -0800 (PST)"],"From":"Hans de Goede <johannes.goede@oss.qualcomm.com>","To":"libcamera-devel@lists.libcamera.org","Cc":"Milan Zamazal <mzamazal@redhat.com>,\n\tHans de Goede <johannes.goede@oss.qualcomm.com>","Subject":"[PATCH v2 1/4] software_isp: swstats_cpu: Prepare for\n\tmulti-threading support","Date":"Mon, 23 Feb 2026 17:09:27 +0100","Message-ID":"<20260223160930.27913-2-johannes.goede@oss.qualcomm.com>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"<20260223160930.27913-1-johannes.goede@oss.qualcomm.com>","References":"<20260223160930.27913-1-johannes.goede@oss.qualcomm.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Proofpoint-GUID":"MM-xm84Y-0IxP98ELwm4l6TJ7sAkBWYR","X-Proofpoint-ORIG-GUID":"MM-xm84Y-0IxP98ELwm4l6TJ7sAkBWYR","X-Authority-Analysis":"v=2.4 cv=CbsFJbrl c=1 sm=1 tr=0 ts=699c7bbf cx=c_pps\n\ta=N1BjEkVkxJi3uNfLdpvX3g==:117 a=rrvG0T/C2D967D07Ol03YQ==:17\n\ta=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n\ta=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8\n\ta=VvikW9XIONpR7lsxkDIA:9 a=crWF4MFLhNY0qMRaF8an:22","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwMjIzMDEzOSBTYWx0ZWRfX647zS9HdaeHr\n\tGejI4lJZIGpr3hqx+0CwoPR/Sgq+PknAIn/3TzY2diPip0ReGnTwQJpIlsXvSQScqKzQKQkiVUB\n\tIcVr8vNKnlGImDFBGzeIAJKZrR2UG20mnlkzymA0y0f5eVB+NIcwMHFAd8c5OfTM+csEewFZb2m\n\tVjzrRL8Nct1FV7pM+cavmfwXyKxuxgqWY8UEmzsddeQvxoFMZiURQfCtXDuDGDrJ4PnzMqEw6uZ\n\tXJZjgrC1RzNcr6gNJUWp8vTrv6UtZ6JP1XXPh76/V6RdjEH2nxnva7i+CHAe9Gl89RUrt7s1+Zx\n\tyOhKlEZuKS7eaCbLZwdmUhReNZaDiKOxOFwAhJChSuboNIuvJC0ReS49ZwRgDxuOf0Ujnocyojf\n\t+yungaeu9oL1Xibw5kjt/U+FYFdNkFAw4ujnWyDc6ujdWDHXl1KNcBzBRSnObxnrHGwnJ1iaTpt\n\tzOBhosGP5GjPnKiwE5g==","X-Proofpoint-Virus-Version":"vendor=baseguard\n\tengine=ICAP:2.0.293, Aquarius:18.0.1121, Hydra:6.1.51,\n\tFMLib:17.12.100.49\n\tdefinitions=2026-02-23_03,2026-02-23_03,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n\tlowpriorityscore=0 adultscore=0 impostorscore=0 priorityscore=1501\n\tsuspectscore=0 phishscore=0 spamscore=0 malwarescore=0 clxscore=1015\n\tbulkscore=0 classifier=typeunknown authscore=0 authtc= authcc=\n\troute=outbound\n\tadjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000\n\tdefinitions=main-2602230139","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"<libcamera-devel.lists.libcamera.org>","List-Unsubscribe":"<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>","List-Archive":"<https://lists.libcamera.org/pipermail/libcamera-devel/>","List-Post":"<mailto:libcamera-devel@lists.libcamera.org>","List-Help":"<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>","List-Subscribe":"<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>"},"content":"Make the storage used to accumulate the RGB sums and the Y histogram\nvalue a vector of SwIspStats objects instead of a single object so\nthat when using multi-threading every thread can use its own storage to\ncollect intermediate stats to avoid cache-line bouncing.\n\nBenchmarking with the GPU-ISP which does separate swstats benchmarking,\non the Arduino Uno-Q which has a weak CPU which is good for performance\ntesting, shows 20ms to generate stats for a 3272x2464 frame both before\nand after this change.\n\nSigned-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>\n---\nChanges in v2:\n- Move the allocation of the vector of SwIspStats objects to inside\n  the SwStatsCpu class, controlled by a configure() arguments instead\n  of making the caller allocate the objects\n---\n .../internal/software_isp/swstats_cpu.h       | 25 ++++-----\n src/libcamera/software_isp/swstats_cpu.cpp    | 54 +++++++++++++------\n 2 files changed, 50 insertions(+), 29 deletions(-)","diff":"diff --git a/include/libcamera/internal/software_isp/swstats_cpu.h b/include/libcamera/internal/software_isp/swstats_cpu.h\nindex 64b3e23f5..feee92f99 100644\n--- a/include/libcamera/internal/software_isp/swstats_cpu.h\n+++ b/include/libcamera/internal/software_isp/swstats_cpu.h\n@@ -12,6 +12,7 @@\n #pragma once\n \n #include <stdint.h>\n+#include <vector>\n \n #include <libcamera/base/signal.h>\n \n@@ -51,13 +52,13 @@ public:\n \n \tconst Size &patternSize() { return patternSize_; }\n \n-\tint configure(const StreamConfiguration &inputCfg);\n+\tint configure(const StreamConfiguration &inputCfg, unsigned int statsBufferCount = 1);\n \tvoid setWindow(const Rectangle &window);\n \tvoid startFrame(uint32_t frame);\n \tvoid finishFrame(uint32_t frame, uint32_t bufferId);\n \tvoid processFrame(uint32_t frame, uint32_t bufferId, FrameBuffer *input);\n \n-\tvoid processLine0(uint32_t frame, unsigned int y, const uint8_t *src[])\n+\tvoid processLine0(uint32_t frame, unsigned int y, const uint8_t *src[], unsigned int statsBufferIndex = 0)\n \t{\n \t\tif (frame % kStatPerNumFrames)\n \t\t\treturn;\n@@ -66,10 +67,10 @@ public:\n \t\t    y >= (window_.y + window_.height))\n \t\t\treturn;\n \n-\t\t(this->*stats0_)(src);\n+\t\t(this->*stats0_)(src, stats_[statsBufferIndex]);\n \t}\n \n-\tvoid processLine2(uint32_t frame, unsigned int y, const uint8_t *src[])\n+\tvoid processLine2(uint32_t frame, unsigned int y, const uint8_t *src[], unsigned int statsBufferIndex = 0)\n \t{\n \t\tif (frame % kStatPerNumFrames)\n \t\t\treturn;\n@@ -78,25 +79,25 @@ public:\n \t\t    y >= (window_.y + window_.height))\n \t\t\treturn;\n \n-\t\t(this->*stats2_)(src);\n+\t\t(this->*stats2_)(src, stats_[statsBufferIndex]);\n \t}\n \n \tSignal<uint32_t, uint32_t> statsReady;\n \n private:\n-\tusing statsProcessFn = void (SwStatsCpu::*)(const uint8_t *src[]);\n+\tusing statsProcessFn = void (SwStatsCpu::*)(const uint8_t *src[], SwIspStats &stats);\n \tusing processFrameFn = void (SwStatsCpu::*)(MappedFrameBuffer &in);\n \n \tint setupStandardBayerOrder(BayerFormat::Order order);\n \t/* Bayer 8 bpp unpacked */\n-\tvoid statsBGGR8Line0(const uint8_t *src[]);\n+\tvoid statsBGGR8Line0(const uint8_t *src[], SwIspStats &stats);\n \t/* Bayer 10 bpp unpacked */\n-\tvoid statsBGGR10Line0(const uint8_t *src[]);\n+\tvoid statsBGGR10Line0(const uint8_t *src[], SwIspStats &stats);\n \t/* Bayer 12 bpp unpacked */\n-\tvoid statsBGGR12Line0(const uint8_t *src[]);\n+\tvoid statsBGGR12Line0(const uint8_t *src[], SwIspStats &stats);\n \t/* Bayer 10 bpp packed */\n-\tvoid statsBGGR10PLine0(const uint8_t *src[]);\n-\tvoid statsGBRG10PLine0(const uint8_t *src[]);\n+\tvoid statsBGGR10PLine0(const uint8_t *src[], SwIspStats &stats);\n+\tvoid statsGBRG10PLine0(const uint8_t *src[], SwIspStats &stats);\n \n \tvoid processBayerFrame2(MappedFrameBuffer &in);\n \n@@ -116,8 +117,8 @@ private:\n \tunsigned int xShift_;\n \tunsigned int stride_;\n \n+\tstd::vector<SwIspStats> stats_;\n \tSharedMemObject<SwIspStats> sharedStats_;\n-\tSwIspStats stats_;\n \tBenchmark bench_;\n };\n \ndiff --git a/src/libcamera/software_isp/swstats_cpu.cpp b/src/libcamera/software_isp/swstats_cpu.cpp\nindex 1cedcfbc1..7c71aed96 100644\n--- a/src/libcamera/software_isp/swstats_cpu.cpp\n+++ b/src/libcamera/software_isp/swstats_cpu.cpp\n@@ -74,11 +74,12 @@ namespace libcamera {\n  */\n \n /**\n- * \\fn void SwStatsCpu::processLine0(uint32_t frame, unsigned int y, const uint8_t *src[])\n+ * \\fn void SwStatsCpu::processLine0(uint32_t frame, unsigned int y, const uint8_t *src[], unsigned int statsBufferIndex = 0)\n  * \\brief Process line 0\n  * \\param[in] frame The frame number\n  * \\param[in] y The y coordinate.\n  * \\param[in] src The input data.\n+ * \\param[in] statsBufferIndex Index of stats buffer to use for multi-threading.\n  *\n  * This function processes line 0 for input formats with\n  * patternSize height == 1.\n@@ -97,14 +98,18 @@ namespace libcamera {\n  * to the line in plane 0, etc.\n  *\n  * For non Bayer single plane input data only a single src pointer is required.\n+ *\n+ * The statsBufferIndex value must be less than the statsBufferCount value passed\n+ * to configure().\n  */\n \n /**\n- * \\fn void SwStatsCpu::processLine2(uint32_t frame, unsigned int y, const uint8_t *src[])\n+ * \\fn void SwStatsCpu::processLine2(uint32_t frame, unsigned int y, const uint8_t *src[], unsigned int statsBufferIndex = 0)\n  * \\brief Process line 2 and 3\n  * \\param[in] frame The frame number\n  * \\param[in] y The y coordinate.\n  * \\param[in] src The input data.\n+ * \\param[in] statsBufferIndex Index of stats buffer to use for multi-threading.\n  *\n  * This function processes line 2 and 3 for input formats with\n  * patternSize height == 4.\n@@ -182,14 +187,14 @@ static constexpr unsigned int kBlueYMul = 29; /* 0.114 * 256 */\n \tyVal = r * kRedYMul;               \\\n \tyVal += g * kGreenYMul;            \\\n \tyVal += b * kBlueYMul;             \\\n-\tstats_.yHistogram[yVal * SwIspStats::kYHistogramSize / (256 * 256 * (div))]++;\n+\tstats.yHistogram[yVal * SwIspStats::kYHistogramSize / (256 * 256 * (div))]++;\n \n #define SWSTATS_FINISH_LINE_STATS() \\\n-\tstats_.sum_.r() += sumR;    \\\n-\tstats_.sum_.g() += sumG;    \\\n-\tstats_.sum_.b() += sumB;\n+\tstats.sum_.r() += sumR;    \\\n+\tstats.sum_.g() += sumG;    \\\n+\tstats.sum_.b() += sumB;\n \n-void SwStatsCpu::statsBGGR8Line0(const uint8_t *src[])\n+void SwStatsCpu::statsBGGR8Line0(const uint8_t *src[], SwIspStats &stats)\n {\n \tconst uint8_t *src0 = src[1] + window_.x;\n \tconst uint8_t *src1 = src[2] + window_.x;\n@@ -214,7 +219,7 @@ void SwStatsCpu::statsBGGR8Line0(const uint8_t *src[])\n \tSWSTATS_FINISH_LINE_STATS()\n }\n \n-void SwStatsCpu::statsBGGR10Line0(const uint8_t *src[])\n+void SwStatsCpu::statsBGGR10Line0(const uint8_t *src[], SwIspStats &stats)\n {\n \tconst uint16_t *src0 = (const uint16_t *)src[1] + window_.x;\n \tconst uint16_t *src1 = (const uint16_t *)src[2] + window_.x;\n@@ -240,7 +245,7 @@ void SwStatsCpu::statsBGGR10Line0(const uint8_t *src[])\n \tSWSTATS_FINISH_LINE_STATS()\n }\n \n-void SwStatsCpu::statsBGGR12Line0(const uint8_t *src[])\n+void SwStatsCpu::statsBGGR12Line0(const uint8_t *src[], SwIspStats &stats)\n {\n \tconst uint16_t *src0 = (const uint16_t *)src[1] + window_.x;\n \tconst uint16_t *src1 = (const uint16_t *)src[2] + window_.x;\n@@ -266,7 +271,7 @@ void SwStatsCpu::statsBGGR12Line0(const uint8_t *src[])\n \tSWSTATS_FINISH_LINE_STATS()\n }\n \n-void SwStatsCpu::statsBGGR10PLine0(const uint8_t *src[])\n+void SwStatsCpu::statsBGGR10PLine0(const uint8_t *src[], SwIspStats &stats)\n {\n \tconst uint8_t *src0 = src[1] + window_.x * 5 / 4;\n \tconst uint8_t *src1 = src[2] + window_.x * 5 / 4;\n@@ -292,7 +297,7 @@ void SwStatsCpu::statsBGGR10PLine0(const uint8_t *src[])\n \tSWSTATS_FINISH_LINE_STATS()\n }\n \n-void SwStatsCpu::statsGBRG10PLine0(const uint8_t *src[])\n+void SwStatsCpu::statsGBRG10PLine0(const uint8_t *src[], SwIspStats &stats)\n {\n \tconst uint8_t *src0 = src[1] + window_.x * 5 / 4;\n \tconst uint8_t *src1 = src[2] + window_.x * 5 / 4;\n@@ -332,8 +337,10 @@ void SwStatsCpu::startFrame(uint32_t frame)\n \tif (window_.width == 0)\n \t\tLOG(SwStatsCpu, Error) << \"Calling startFrame() without setWindow()\";\n \n-\tstats_.sum_ = RGB<uint64_t>({ 0, 0, 0 });\n-\tstats_.yHistogram.fill(0);\n+\tfor (unsigned int i = 0; i < stats_.size(); i++) {\n+\t\tstats_[i].sum_ = RGB<uint64_t>({ 0, 0, 0 });\n+\t\tstats_[i].yHistogram.fill(0);\n+\t}\n }\n \n /**\n@@ -345,8 +352,19 @@ void SwStatsCpu::startFrame(uint32_t frame)\n  */\n void SwStatsCpu::finishFrame(uint32_t frame, uint32_t bufferId)\n {\n-\tstats_.valid = frame % kStatPerNumFrames == 0;\n-\t*sharedStats_ = stats_;\n+\tbool valid = frame % kStatPerNumFrames == 0;\n+\n+\tif (valid) {\n+\t\tsharedStats_->sum_ = RGB<uint64_t>({ 0, 0, 0 });\n+\t\tsharedStats_->yHistogram.fill(0);\n+\t\tfor (unsigned int i = 0; i < stats_.size(); i++) {\n+\t\t\tsharedStats_->sum_ += stats_[i].sum_;\n+\t\t\tfor (unsigned int j = 0; j < SwIspStats::kYHistogramSize; j++)\n+\t\t\t\tsharedStats_->yHistogram[j] += stats_[i].yHistogram[j];\n+\t\t}\n+\t}\n+\n+\tsharedStats_->valid = valid;\n \tstatsReady.emit(frame, bufferId);\n }\n \n@@ -389,12 +407,14 @@ int SwStatsCpu::setupStandardBayerOrder(BayerFormat::Order order)\n /**\n  * \\brief Configure the statistics object for the passed in input format\n  * \\param[in] inputCfg The input format\n+ * \\param[in] statsBufferCount number of internal stats buffers to use for multi-threading\n  *\n  * \\return 0 on success, a negative errno value on failure\n  */\n-int SwStatsCpu::configure(const StreamConfiguration &inputCfg)\n+int SwStatsCpu::configure(const StreamConfiguration &inputCfg, unsigned int statsBufferCount)\n {\n \tstride_ = inputCfg.stride;\n+\tstats_.resize(statsBufferCount);\n \n \tBayerFormat bayerFormat =\n \t\tBayerFormat::fromPixelFormat(inputCfg.pixelFormat);\n@@ -504,7 +524,7 @@ void SwStatsCpu::processBayerFrame2(MappedFrameBuffer &in)\n \t\t/* linePointers[0] is not used by any stats0_ functions */\n \t\tlinePointers[1] = src;\n \t\tlinePointers[2] = src + stride_;\n-\t\t(this->*stats0_)(linePointers);\n+\t\t(this->*stats0_)(linePointers, stats_[0]);\n \t\tsrc += stride_ * 2;\n \t}\n }\n","prefixes":["v2","1/4"]}