Transparent memory offloading: more memory at a fraction of the cost and power
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Linux Kernel: PSI - Pressure Stall Information /proc/pressure/io 㧠IO å¾…ã¡ã‚’観察ã™ã‚‹ - hibomaã®æ—¥è¨˜
www.kernel.org Linux Kernel 4.20 ã§å°Žå…¥ã•ã‚ŒãŸ PSI - Pressure Stall Information ã® /proc/pressure/io ã«ã¤ã„ã¦æ°—ã«ãªã‚‹ã“ã¨ãŒã‚ã£ãŸã®ã§èª¿ã¹ã¦ã„ã¾ã—㟠イントãƒãƒ€ã‚¯ã‚·ãƒ§ãƒ³ PSI を使ã†ã¨ CPU, メモリ, IO 㧠stall ã—ãŸæ™‚é–“(割åˆ) を計測ã§ãã‚‹ã£ã¦ãªã“ã¨ã§ã™ãŒã€ã©ã†ã„ã£ãŸå®Ÿè£…ã§ã€ŒIO å¾…ã¡ã€ãªã‚¿ã‚¹ã‚¯ã‚’計測ã—ã¦ã„ã‚‹ã®ã‹ã‹ãŒç–‘å•ã§ã€ç¤¾å†…㧠udzula ã•ã‚“ã‚ã‚Œã“れ話をèžã„ã¦ã„ãŸã®ã§ã—㟠ソースをèªã‚€ io_schedule_prepare() ã¨ã„ã†é–¢æ•°ã‚’呼ã³å‡ºã™éš›ã« current->in_iowait = 1 をセットã—ã¦ã„ã¦ã€ã“ã‚ŒãŒãƒã‚¤ãƒ³ãƒˆ int io_schedule_prepare(void) { int old_iowait = current->in_iowait; curre
Linux Kernel: PSI - Pressure Stall Information /proc/pressure/memory 㧠メモリã®ã‚¹ãƒˆãƒ¼ãƒ«ã‚’観察ã™ã‚‹ - hibomaã®æ—¥è¨˜
下記ã®ç¶šãエントリã§ã™ hiboma.hatenadiary.jp 今回㯠PSI - Pressure Stall Information ã® /proc/pressure/memory ã«ã¤ã„ã¦ã®ã‚¨ãƒ³ãƒˆãƒª PSI を使ã†ã¨ CPU, メモリ, IO 㧠stall ã—ãŸæ™‚é–“(割åˆ) を計測ã§ãã‚‹ã£ã¦ãªã“ã¨ã§ã™ãŒã€ã©ã†ã„ã£ãŸå®Ÿè£…ã§ã€Œmemory stall = メモリã®ã‚¹ãƒˆãƒ¼ãƒ«ã€ã‚’èµ·ã“ã—ã¦ã„るタスクを計測ã—ã¦ã„ã‚‹ã®ã‹ã‹ãŒç–‘å•ã§èª¿ã¹ã¦ã„ã¾ã—㟠PSI ã®ãƒ‰ã‚ュメント www.kernel.org æ£ç›´ã€ãƒ‰ã‚ュメントをèªã‚“ã ã ã‘ã§ã¯ /proc/pressure/memory ãŒã©ã†ã„ã£ãŸã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§è¨ˆä¸Šã•ã‚Œã‚‹ã®ã‹åˆ†ã‹ã‚Šã¾ã›ã‚“ã§ã—ãŸ. ソースをèªã‚€ www.kernel.org ./kernel/sched/psi.c ã‚’ã–ーã£ã¨å‘¼ã‚“ã§ã„ã£ã¦ psi_memstall_enter() 㨠p
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