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# zephyr
s
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๐Ÿ‘ 1
s
์‹œ์Šคํ…œ ํ‹ฑ์ด ์‹ค์ œ ํ๋ฅธ ์‹œ๊ฐ„๋ณด๋‹ค ๋” ํ๋ฅด์ง€๋Š” ์•Š๊ณ  ๋Œ€์‹  CPU๊ฐ€ wake-upํ•˜์ง€ ์•Š์•„์•ผ๋  ๋•Œ๋„ wakeupํ•˜๋Š” ๋ฌธ์ œ๋Š” ์žˆ์Šต๋‹ˆใ…ใ„ท.
ํ˜„์žฌ Zephyr ์ปค๋„ ์„ค๊ณ„ ๊ตฌ์กฐ์ ์ธ ๋ฌธ์ œ์ด๊ธฐ๋Š” ํ•œ๋ฐ tickless ์ปค๋„์—์„œ timeout์ด ๋ชจ๋“  CPU์— ๊ณตํ†ต์œผ๋กœ ๊ด€๋ฆฌ๋˜๊ธฐ ๋•Œ๋ฌธ์— CPU ๋“ค ์ค‘ ํ•˜๋‚˜๋ผ๋„ wakeup timeout์ด ํ•ด๋‹น๋˜๋Š” ๊ฒƒ์ด ์žˆ๋‹ค๋ฉด ๋ชจ๋“  CPU๊ฐ€ ์ผ๊ด„ wakeupํ•˜๊ฒŒ ๋˜์–ด์žˆ์Šต๋‹ˆ๋‹ค.
๐Ÿ‘ 1
u
์™€, ๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค. ๋•๋ถ„์— ์ดํ•ด๋์Šต๋‹ˆ๋‹ค. โ€˜์‹œ๊ฐ„์ด ๋” ํ๋ฅผ ๊ฒƒ ๊ฐ™๋‹คโ€™ ํ–ˆ๋˜๊ฑด ์ œ๊ฐ€ per-cpu counter ๋กœ ์ƒ๊ฐํ•ด์„œ ๊ทธ๋žฌ์—ˆ์–ด์š”. ๊ทผ๋ฐ PR์— ์ปค๋ฐ‹ ์ด๋ ฅ์ด ๋‚จ์œผ๋ฉด ๋” ์ข‹์„ ๊ฒƒ ๊ฐ™์€๋ฐ, force-push ๋˜๋Š” ๊ฒŒ ์ข€ ์•„์‰ฝ๋„ค์š”.
๐Ÿ‘
๊ทธ๋ฆฌ๊ณ  ์ด๊ฑด ์ค‘์š”ํ•œ ๊ฑด ์•„๋‹Œ๋ฐ,
z_kernel
๊ตฌ์กฐ์ฒด์˜
timeout_q
๋ฅผ ์‚ฌ์šฉํ•˜์ง€ ์•Š๊ณ  timeout.c ๋ชจ๋“ˆ์˜
timeout_list
static ๋ณ€์ˆ˜๋ฅผ ์“ฐ๋Š” ์ด์œ ๊ฐ€ ์žˆ๋Š”์ง€๋„ ๊ถ๊ธˆํ•ฉ๋‹ˆ๋‹ค.
๐Ÿ‘ 1
์ด์ œ๋Š” ๋”์ด์ƒ ์‚ฌ์šฉ๋˜์ง€ ์•Š๋Š” ๊ตฌ์กฐ์ฒด์ž…๋‹ˆ๋‹ค
๋ช‡๋…„์ „์— timeout.c ์ „์— sys_clock.c๋ผ๊ณ  ๋น„์Šทํ•œ ๋งค์ปค๋‹ˆ์ฆ˜์ด ์žˆ์—ˆ๋Š”๋ฐ ๊ทธ ๋•Œ ์‚ฌ์šฉํ–ˆ๋˜ ๊ฒƒ์ด๋„ค์š”
์žŠ๊ณ  ์‚ญ์ œ์•ˆํ•œ๋“ฏ ..
u
๋„ค,
timeout_list
์šฉ๋„๋กœ
timeout_q
๋ฉค๋ฒ„๋ณ€์ˆ˜๋ฅผ
z_kernel
๊ตฌ์กฐ์ฒด์— ์„ ์–ธํ•ด๋‘” ๊ฒƒ ๊ฐ™์€๋ฐ, ๊นŒ๋จน๊ณ 
timeout_list
๋ฅผ ์‚ฌ์šฉํ–ˆ๋‚˜ ์ƒ๊ฐํ–ˆ์—ˆ์–ด์š”.