Вышло новое ядро Linux 3.10

В воскресенье вечером официально вышло новое ядро Linux 3.10. По словам Линуса Торвальдса, ядро получилось самым большим по объему нововведений за последние несколько лет. Первоначально Линус предполагал выпустить еще один релиз-кандидат, но склонился к тому, чтобы выпустить финальный релиз 3.10 — и в своем сообщении он замечает, что новое ядро, как и Linux 3.9, не склонно к проблемам с работоспособностью, и готово к повседневному использованию.

В анонсе RC-версии Торвальдс писал, что обычно он включал список имен людей, которые прислали те или иные части кода, однако на сей раз этот список был столь велик, что его нельзя было привести целиком в одном листе рассылки.

Неполный список внесённых в ядро 3.10 изменений:

  • Можно запретить выполнять скрипты как программы — функционал запуска скриптов, содержащие путь к интерпретатору в заголовке “#!”, теперь может быть собран в виде модуля ядра;
  • Интегрирована разработанная и используемая в Google система Bcache. Bcache позволяет организовать кэширование доступа к медленным жестким дискам на быстрых SSD-накопителях; кэширование при этом ведётся на уровне блочного устройства — и это позволяет ускорить доступ к накопителю, причем независимо от используемых файловых систем на устройстве;
  • Ядро можно собирать компилятором Clang благодаря подготовленным проектом LLVMLinux патчам;
  • Появилась динамическая система управления генерацией прерываний таймером. Теперь можно в зависимости от текущего состояния изменять прерывания в диапазоне от тысяч тиков в секунду до одного прерывания в секунду — это позволяет сводить к минимуму нагрузку на CPU при обработке прерываний в случае неактивности системы. Сейчас эта функция используется для систем реального времени и HPC (высокопроизводительных вычислений), но в следующих выпусках ядра будет задействована и для десктоп-систем тоже;
  • Появилась возможность генерации события с уведомлением приложения о приближении к исчерпанию доступной процессу/системе памяти (в cgroups);
  • Для команды perf стало доступно профилирование доступа к памяти;
  • Появился новый драйвер «sync» (экспериментальный). Он был разработан в рамках платформы Android и используется для синхронизации между другими драйверами;
  • Появился драйвер для виртуальных видеоадаптеров Microsoft Hyper-V (по работе Hyper-V в целом тоже есть улучшения);
  • Теперь поддерживаются новые средства управления питанием, которые появились в процессорах AMD семейства 16h («Jaguar»);
  • Поддержка ускорения декодирования видео с использованием аппаратного декодера UVD, встроенного в современные GPU AMD, была добавлена в DRM-модуль Radeon;
  • Добавлена поддержка протокола RDMA (iSER) в подсистему iSCSI;
  • Выполнение криптографических функций (sha256, sha512, blowfish, twofish, serpent и camellia) оптимизировано с использованием инструкций AVX/AVX2 и SSE.;
  • Был интегрирован драйвер виртуальной графической карты QXL (применяется в системах виртуализации для ускоренного вывода графики при помощи протокола SPICE).

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