{"id":38149,"date":"2019-10-31T22:21:56","date_gmt":"2019-10-31T19:21:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/yadro-linux-5-3-uvidelo-svet\/"},"modified":"2019-10-31T22:21:56","modified_gmt":"2019-10-31T19:21:56","slug":"yadro-linux-5-3-uvidelo-svet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/yadro-linux-5-3-uvidelo-svet","title":{"rendered":"Il kernel Linux 5.3 \u00e8 stato rilasciato!","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><b>Novit\u00e0 principali<\/b><br \/>\n<noindex><\/p>\n<ul>\n<li>Meccanismo pidfd che consente di legare un PID specifico a un dato processo. Il legame rimane attivo anche dopo la terminazione del processo, per permettere di riutilizzare il PID al suo successivo avvio. <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/789023\/\">Dettagli<\/a>.<\/noindex>\n<\/li>\n<li>Limitazioni delle bande di frequenza nel pianificatore dei processi. Ad esempio, i processi critici possono essere avviati con una soglia minima di frequenza (ad esempio, non inferiore a 3 GHz), mentre quelli a bassa priorit\u00e0 con una soglia massima di frequenza (per esempio, non superiore a 2 GHz). <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/762043\/\">Dettagli<\/a>.\n<\/li>\n<li>Supporto per le GPU della famiglia AMD Navi (RX5700) nel driver amdgpu. Sono implementate tutte le funzionalit\u00e0 necessarie, compresi codifica\/decodifica video e gestione energetica.\n<\/li>\n<li>Funzionamento completo sui processori compatibili x86 Zhaoxin, sviluppati in collaborazione tra VIA e il governo di Shanghai.\n<\/li>\n<li>Sottosistema di gestione dell'alimentazione basato sulla tecnologia Intel Speed Select, tipica di alcuni processori della famiglia Xeon. Questa tecnologia \u00e8 nota per la possibilit\u00e0 di personalizzare dettagliatamente la performance per ciascun core della CPU.\n<\/li>\n<li>Meccanismo energeticamente efficiente per la modalit\u00e0 di attesa dei processi nello spazio utente, che utilizza le istruzioni umwait per i processori Intel Tremont. <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/790920\/\">Dettagli<\/a>.\n<\/li>\n<li>\u00c8 stato autorizzato l'uso dell'intervallo 0.0.0.0\/8, fornendo cos\u00ec 16 milioni di nuovi indirizzi IPv4. <a rel=\"nofollow\" href=\"https:\/\/netdevconf.org\/0x13\/session.html?talk-ipv4-unicast-expansions\">Dettagli<\/a>.\n<\/li>\n<li>Hypervisor flessibile e leggero ACRN, particolarmente adatto per la gestione dei sistemi IoT (Internet delle cose). <a rel=\"nofollow\" href=\"https:\/\/projectacrn.org\/\">Dettagli<\/a>.\n<\/li>\n<\/ul>\n<p>\nDi seguito sono elencate alcune altre modifiche.<\/p>\n<p><b>Parte principale del kernel<\/b>\n<\/p>\n<ul>\n<li>Supporto per la compressione dei firmware nel formato xz, permettendo di ridurre la directory \/lib\/firmware da ~420 MB a ~130 MB.\n<\/li>\n<li>Nuova variante della chiamata di sistema clone() con la possibilit\u00e0 di specificare un numero maggiore di flag. <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/792628\/\">Dettagli<\/a>.\n<\/li>\n<li>Selezione automatica di un carattere di dimensione maggiore per risoluzioni elevate nella console.\n<\/li>\n<li>Opzione CONFIG_PREEMPT_RT, che segna l'imminente integrazione del set di patch RT nel ramo principale del kernel.\n<\/li>\n<\/ul>\n<p><b>Sottosistema file<\/b>\n<\/p>\n<ul>\n<li>Chiamate di sistema BULKSTAT e INUMBERS per XFS v5, inoltre sono stati avviati i lavori per l'implementazione del percorso multithreaded degli inode.\n<\/li>\n<li>Btrfs ora utilizza checksum rapidi (crc32c) su tutte le architetture.\n<\/li>\n<li>Per i file aperti su Ext4 viene ora applicato rigidamente il flag di immutabilit\u00e0. Implementato il supporto per i buchi (holes) nelle directory.\n<\/li>\n<li>CEPH ha imparato a lavorare con SELinux.\n<\/li>\n<li>Il meccanismo smbdirect in CIFS non \u00e8 pi\u00f9 considerato sperimentale. Sono stati aggiunti algoritmi crittografici per SMB3.1.1 GCM. \u00c8 stata aumentata la velocit\u00e0 di apertura dei file.\n<\/li>\n<li>\u00c8 possibile posizionare file di swap su F2FS, che funzionano in modalit\u00e0 di accesso diretto. \u00c8 disponibile l'opzione di disabilitare il garbage collector con checkpoint=disable.\n<\/li>\n<li>I client NFS possono stabilire pi\u00f9 connessioni TCP al server attraverso l'opzione di montaggio nconnect=X.\n<\/li>\n<\/ul>\n<p><b>Sottosistema di memoria<\/b>\n<\/p>\n<ul>\n<li>A ciascun dma-buf viene assegnato un inode completo. Dalle directory \/proc\/*\/fd e \/proc\/*\/map_files \u00e8 possibile ottenere molte informazioni dettagliate sull'uso dei buffer shmem.\n<\/li>\n<li>Il meccanismo smaps mostra informazioni separate sulla memoria anonima e condivisa, cos\u00ec come sulla cache di file nel file proc smaps_rollup.\n<\/li>\n<li>L'uso di rbtree per swap_extent ha migliorato le prestazioni in condizioni di utilizzo intensivo della memoria di swap da parte di pi\u00f9 processi.\n<\/li>\n<li>In \/proc\/meminfo viene visualizzato il numero di pagine vmalloc.\n<\/li>\n<li>Le funzionalit\u00e0 di tools\/vm\/slabinfo sono state ampliate in termini di ordinamento delle cache in base al grado di frammentazione.\n<\/li>\n<\/ul>\n<p><b>Virtualizzazione e sicurezza<\/b>\n<\/p>\n<ul>\n<li>Il driver virtio-iommu per dispositivi paravirtualizzati consente di inviare richieste IOMMU senza emulazione delle tabelle degli indirizzi.\n<\/li>\n<li>Il driver virtio-pmem per l'accesso ai dispositivi di archiviazione tramite spazio fisico degli indirizzi.\n<\/li>\n<li>Accelerazione dell'accesso ai metadati per vhost. Per i test TX PPS si osserva un aumento della velocit\u00e0 del 24%.\n<\/li>\n<li>Per vhost_net, zerocopy \u00e8 disabilitato per impostazione predefinita.\n<\/li>\n<li>Le chiavi di crittografia possono essere associate agli spazi dei nomi.\n<\/li>\n<li>Supporto per xxhash \u2014 un algoritmo di hashing non crittografico estremamente veloce, la cui velocit\u00e0 \u00e8 limitata solo dalle prestazioni della memoria.\n<\/li>\n<\/ul>\n<p><b>Sottosistema di rete<\/b>\n<\/p>\n<ul>\n<li>Supporto iniziale per oggetti nexthop, creati per migliorare la scalabilit\u00e0 delle rotte IPv4 e IPv6.\n<\/li>\n<li>Netfilter ha imparato a scaricare la filtrazione su dispositivi hardware di accelerazione. Aggiunto supporto integrato per il tracciamento delle connessioni per i bridge.\n<\/li>\n<li>Nuovo modulo di controllo del traffico, che consente di manipolare le intestazioni dei pacchetti MPLS.\n<\/li>\n<li>Rimossa la sottosistema isdn4linux.\n<\/li>\n<li>LE-ping disponibili per Bluetooth.\n<\/li>\n<\/ul>\n<p><b>Architetture hardware<\/b><\/p>\n<ul>\n<li>Nuove piattaforme e dispositivi ARM: Mediatek mt8183, Amlogic G12B, Kontron SMARC SoM, Google Cheza, devkit per Purism Librem5, Qualcomm Dragonboard 845c, Hugsun X99 TV Box, e altri.\n<\/li>\n<li>Per x86 \u00e8 stato aggiunto meccanismo \/proc\/\/arch_status per visualizzare informazioni architettonicamente specifiche come il tempo dell'ultimo utilizzo di AVX512.\n<\/li>\n<li>Ottimizzato il funzionamento di VMX per KVM, la velocit\u00e0 di vmexit \u00e8 aumentata del 12%.\n<\/li>\n<li>Informazioni aggiornate sui processori Intel KabyLake, AmberLake, WhiskeyLake e Ice Lake sono state aggiunte.\n<\/li>\n<li>Compressione lzma e lzo per uImage su PowerPC.\n<\/li>\n<li>Virtualizzazione virtio protetta per S390.\n<\/li>\n<li>Supporto per pagine di memoria grandi per RISCV.\n<\/li>\n<li>Modalit\u00e0 di viaggio nel tempo per User-mode Linux (rallentamento e accelerazione del tempo).\n<\/li>\n<\/ul>\n<p><b>Driver per dispositivi<\/b>\n<\/p>\n<ul>\n<li>Riconoscimento dei metadati HDR per i driver amdgpu e i915.\n<\/li>\n<li>Estensioni funzionali per le schede grafiche Vega12 e Vega20 in amdgpu.\n<\/li>\n<li>Correzione gamma multisegmintaria per i915, insieme a disattivazione asincrona dell'alimentazione dello schermo e una serie di nuovi firmware.\n<\/li>\n<li>Il driver video Nouveau ha imparato a riconoscere i chip della famiglia TU116.\n<\/li>\n<li>Nuovi protocolli Bluetooth MediaTek MT7663U e MediaTek MT7668U.\n<\/li>\n<li>Scarico TLS TX HW per Infiniband, oltre a monitoraggio hardware e di temperatura ampliato.\n<\/li>\n<li>Riconoscimento di Elkhart Lake nel driver HD Audio.\n<\/li>\n<li>Nuovi dispositivi audio e codec: Conexant CX2072X, Cirrus Logic CS47L35\/85\/90, Cirrus Logic Madera, RT1011\/1308.\n<\/li>\n<li>Driver Apple SPI per tastiera e trackpad.\n<\/li>\n<li>Nel sottosistema watchdog \u00e8 possibile impostare un tempo limite per l'apertura di \/dev\/watchdogN.\n<\/li>\n<li>Il meccanismo di gestione della frequenza cpufreq ha ricevuto supporto per imx-cpufreq-dt e Raspberry Pi.\n<\/li>\n<\/ul>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/kernel\/15227621\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u043b\u0430\u0432\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430 \u041c\u0435\u0445\u0430\u043d\u0438\u0437\u043c pidfd, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0437\u0430\u043a\u0440\u0435\u043f\u0438\u0442\u044c \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u044b\u0439 PID \u0437\u0430 \u043a\u0430\u043a\u0438\u043c-\u043b\u0438\u0431\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u043c. \u0417\u0430\u043a\u0440\u0435\u043f\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u0442 \u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0438 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430, \u0447\u0442\u043e\u0431\u044b PID \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0432\u044b\u0434\u0430\u0442\u044c \u0435\u043c\u0443 \u043f\u0440\u0438 \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u043e\u043c \u0437\u0430\u043f\u0443\u0441\u043a\u0435. \u041f\u043e\u0434\u0440\u043e\u0431\u043d\u043e\u0441\u0442\u0438. \u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0447\u0430\u0441\u0442\u043e\u0442\u043d\u044b\u0445 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d\u043e\u0432 \u0432 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u044b \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0442\u044c \u0441 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u043c \u043f\u043e\u0440\u043e\u0433\u043e\u043c \u0447\u0430\u0441\u0442\u043e\u0442\u044b (\u0441\u043a\u0430\u0436\u0435\u043c, \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 3 \u0413\u0413\u0446), \u0430 \u043d\u0438\u0437\u043a\u0440\u043e\u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442\u043d\u044b\u0435 \u2014 \u0441 \u0432\u0435\u0440\u0445\u043d\u0438\u043c \u043f\u043e\u0440\u043e\u0433\u043e\u043c \u0447\u0430\u0441\u0442\u043e\u0442\u044b 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