Teknomotor c55k 4-075-01-0813
如果空閑頁數(shù)目min值，則該zone非常缺頁，頁面回收壓力很大，應(yīng)用程序?qū)憙?nèi)存操作就會被阻塞，直接在應(yīng)用程序的進程上下文中進行回收，即direct reclaim。
如果空閑頁數(shù)目小于low值，kswapd線程將被喚醒，并開始釋放回收頁面。
如果空閑頁面的值大于high值，則該zone的狀態(tài)很完美， kswapd線程將重新休眠。
Linux頁框分配器之內(nèi)存碎片化整理什么是內(nèi)存碎片化
Linux物理內(nèi)存碎片化包括兩種：內(nèi)部碎片化和外部碎片化。
內(nèi)部碎片化：
指分配給用戶的內(nèi)存空間中未被使用的部分。例如進程需要使用3K bytes物理內(nèi)存，于是向系統(tǒng)申請了大小等于3Kbytes的內(nèi)存，但是由于Linux內(nèi)核伙伴系統(tǒng)算法最小顆粒是4K bytes，所以分配的是4Kbytes內(nèi)存，那么其中1K bytes未被使用的內(nèi)存就是內(nèi)存內(nèi)碎片。如果您需要訂購產(chǎn)品超過1件，請與我們聯(lián)系，我們可以為您提供折扣。
*我們僅采用快遞方式遞送備件。（順豐）
*如果您發(fā)現(xiàn)其他供貨商為相同產(chǎn)品提供更為低廉的價格，我們也愿意參照其價格向您提供進一步的折扣。
如果還有其他任何問題，請隨時與我們聯(lián)系。
*請讓我們知道您有任何，備品，備件，的需要，我們可以給您進一步的援助，我們等候您的詢盤。
————————廈門光沃自動化設(shè)備有限公司———————————————
· ?person：小歐?
· ?Mobile phone：18030229050 ?
· ?Telephone：0592-5709821?
· ?Fax：0592-5917519
· ?QQ:1878187406?
· ?E-mail:1878187406@qq?
外部碎片化：
指系統(tǒng)中無法利用的小內(nèi)存塊。例如系統(tǒng)剩余內(nèi)存為16K bytes，但是這16K bytes內(nèi)存是由4個4K bytes的頁面組成，即16K內(nèi)存物理頁幀號#1不連續(xù)。在系統(tǒng)剩余16K bytes內(nèi)存的情況下，系統(tǒng)卻無法成功分配大于4K的連續(xù)物理內(nèi)存，該情況就是內(nèi)存外碎片導(dǎo)致。
碎片化整理算法
Linux內(nèi)存對碎片化的整理算法主要應(yīng)用了內(nèi)核的頁面遷移機制，是一種將可移動頁面進行遷移后騰出連續(xù)物理內(nèi)存的方法。
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