140AVI03000 Quantum
用于設(shè)置或顯示當(dāng)前使用的跟蹤器;使用 echo 將跟蹤器名字寫入該文件可以切換到不同的跟蹤器。系統(tǒng)啟動(dòng)后,其缺省值為 nop ,即不做任何跟蹤操作。在執(zhí)行完一段跟蹤任務(wù)后,可以通過(guò)向該文件寫入 nop 來(lái)重置跟蹤器。
available_filter_functions
記錄了當(dāng)前可以跟蹤的內(nèi)核函數(shù)。對(duì)于不在該文件中列出的函數(shù),無(wú)法跟蹤其活動(dòng)。
available_tracers
記錄了當(dāng)前編譯進(jìn)內(nèi)核的跟蹤器的列表,可以通過(guò) cat 查看其內(nèi)容;寫 current_tracer 文件時(shí)用到的跟蹤器名字在該文件列出的跟蹤器名字列表中。
buffer_size_kb
用于設(shè)置單個(gè) CPU 所使用的跟蹤緩存的大小。跟蹤器會(huì)將跟蹤到的信息寫入緩存,每個(gè) CPU 的跟蹤緩存是一樣大的。跟蹤緩存實(shí)現(xiàn)為環(huán)形緩沖區(qū)的形式,如果跟蹤到的信息太多,則舊的信息會(huì)被新的跟蹤信息覆蓋掉。注意,要更改該文件的值需要先將 current_tracer 設(shè)置為 nop 才可以。
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