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06c6c6616b
24-1-mkql-runtime
add-upcoming-event-1
alexv-smirnov-patch-1
alexv-smirnov-patch-2
alexv-smirnov-patch-3
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bs/vdisk/split-synclog-processing
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cmake2
cmake3
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dev-jinja-html
dev-jinja-html2
dev-night
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AlexSm
6d3e410c45
Remove CMakeLists from main (#2032)
|
9 месяцев назад | |
|---|---|---|
| .. | ||
| README.md | d28c55ab25 Intermediate changes | 1 год назад |
| stockpile.h | d28c55ab25 Intermediate changes | 1 год назад |
| stockpile_linux.cpp | d28c55ab25 Intermediate changes | 1 год назад |
| stockpile_other.cpp | d28c55ab25 Intermediate changes | 1 год назад |
| ya.make | d28c55ab25 Intermediate changes | 1 год назад |
README.md
stockpile
При приближении к лимиту памяти в memory cgroup, linux запускает механизм direct reclaim, чтобы освободить свободную память. По опыту YT, direct reclaim очень сильно замедляет работу всего процесса.
Проблема возникает не только, когда память занята анонимными страницами. 50% памяти контейнера может быть занято не dirty страницами page cache, но проблема всёравно будет проявляться. Например, если процесс активно читает файлы с диска без O_DIRECT, вся память очень быстро будет забита.
Чтобы бороться с этой проблемой, в яндексовом ядре добавлена ручка madvise(MADV_STOCKPILE).
Больше подробностей в https://st.yandex-team.ru/KERNEL-186