{"id":52100,"date":"2019-10-31T00:00:00","date_gmt":"2019-10-30T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/microsoft-realizoval-v-wsl2-windows-subsystem-for-linux-vozvrashhenie-pamyati-sisteme"},"modified":"2020-02-18T13:59:46","modified_gmt":"2020-02-18T10:59:46","slug":"microsoft-realizoval-v-wsl2-windows-subsystem-for-linux-vozvrashhenie-pamyati-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/microsoft-realizoval-v-wsl2-windows-subsystem-for-linux-vozvrashhenie-pamyati-sisteme","title":{"rendered":"A Microsoft implementou no WSL2 (Windows Subsystem for Linux) a recupera\u00e7\u00e3o de mem\u00f3ria para o sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Empresa Microsoft anunciou<\/a><\/noindex> sobre a expans\u00e3o das capacidades da camada WSL2 (Windows Subsystem for Linux), que permite a execu\u00e7\u00e3o de arquivos execut\u00e1veis do Linux no Windows. Nas compila\u00e7\u00f5es experimentais Windows Insider<\/a><\/noindex> (build 19013) na camada WSL2, o suporte para recupera\u00e7\u00e3o de mem\u00f3ria (Memory Reclamation) foi adicionado, permitindo que a mem\u00f3ria liberada por processos que operam em um ambiente baseado no kernel do Linux seja devolvida ao sistema. <\/p>\n

Anteriormente, em caso de aumento do consumo de mem\u00f3ria por aplicativos ou pelo n\u00facleo, a mem\u00f3ria era alocada na m\u00e1quina virtual WSL2, mas permanecia fixada e n\u00e3o era devolvida ao sistema, mesmo ap\u00f3s a conclus\u00e3o de um processo intensivo e sem necessidade adicional da mem\u00f3ria alocada. O mecanismo de Memory Reclamation permite devolver a mem\u00f3ria liberada ao sistema operacional principal e reduzir automaticamente o tamanho da mem\u00f3ria da m\u00e1quina virtual. Com isso, \u00e9 devolvida n\u00e3o apenas a mem\u00f3ria liberada pelos processos do usu\u00e1rio, mas tamb\u00e9m a mem\u00f3ria utilizada para cache no n\u00facleo Linux. Por exemplo, em alta atividade de disco, o tamanho do cache de p\u00e1gina aumenta, onde o conte\u00fado dos arquivos se acumula ao trabalhar com o sistema de arquivos. Ap\u00f3s a execu\u00e7\u00e3o de 'echo 1 > \/proc\/sys\/vm\/drop_caches', o cache pode ser limpo e a mem\u00f3ria devolvida ao sistema operacional principal.<\/p>\n

A implementa\u00e7\u00e3o do Memory Reclamation \u00e9 baseada em
\num patch<\/a><\/noindex>, proposto pelos engenheiros da Intel para ser inclu\u00eddo no kernel principal do Linux, com o objetivo de expandir as capacidades do driver virtio-balloon e do sistema de gerenciamento de mem\u00f3ria. O patch \u00e9 projetado para uso em qualquer sistema convidado para devolver p\u00e1ginas de mem\u00f3ria n\u00e3o utilizadas ao sistema host e pode ser aplicado com diversos hypervisores. No caso do WSL2, o patch foi adaptado para devolver mem\u00f3ria ao hypervisor Hyper-V.<\/p>\n

Vale lembrar que a segunda edi\u00e7\u00e3o do WSL caracteriza-se<\/a><\/noindex> traz um n\u00facleo Linux completo em vez de um emulador que traduz chamadas de sistema do Linux em chamadas de sistema do Windows. O n\u00facleo fornecido no WSL2 baseado na vers\u00e3o 4.19<\/a><\/noindex> \u00e9 executado em um ambiente Windows por meio de uma m\u00e1quina virtual j\u00e1 utilizada no Azure. Atualiza\u00e7\u00f5es para o n\u00facleo Linux s\u00e3o entregues por meio do mecanismo Windows Update e s\u00e3o testadas na infraestrutura de integra\u00e7\u00e3o cont\u00ednua da Microsoft. Os patches espec\u00edficos para o WSL2 aplicados no n\u00facleo incluem otimiza\u00e7\u00f5es para reduzir o tempo de inicializa\u00e7\u00e3o do n\u00facleo, diminuir o consumo de mem\u00f3ria e manter no n\u00facleo o conjunto m\u00ednimo necess\u00e1rio de drivers e subsistemas.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Microsoft \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439 \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0438 WSL2 (Windows Subsystem for Linux), \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0439 \u0437\u0430\u043f\u0443\u0441\u043a \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432 Linux \u0432 Windows. \u0412 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 Windows Insider (build 19013) \u0432 \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0435 WSL2 \u043f\u043e\u044f\u0432\u0438\u043b\u0430\u0441\u044c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 (Memory Reclamation), \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u043c\u0438 \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u043d\u0430 \u0431\u0430\u0437\u0435 \u044f\u0434\u0440\u0430 Linux. \u0420\u0430\u043d\u0435\u0435 \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u0440\u043e\u0441\u0442\u0430 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u043c\u0438 \u0438\u043b\u0438 \u044f\u0434\u0440\u043e\u043c, \u043f\u0430\u043c\u044f\u0442\u044c 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