Date: Mon, 22 Jun 1998 14:45:46 -0400 (EDT) From: zhihuizhang <bf20761@binghamton.edu> To: hackers <freebsd-hackers@FreeBSD.ORG> Subject: Questions concerning cache buffer Message-ID: <Pine.SOL.L3.93.980622143355.20549A-100000@bingsun1>
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I am reading the source code of brelse() in file kern/vfs_bio.c and have three questions to ask (I can not find relevant information in the 4.4 BSD book and the buffer management in FreeBSD is somewhat different from that in 4.4BSD): (1) What is a bogus page? How it is used? (2) Does the paged I/O array b_pages[] of a buffer alway have *contiguous* pages? (3) A page can be partially valid and/or dirty. What is the relationship between being valid and being dirty? Thanks a lot. ------------------------------------------------- Zhihui Zhang Department of Computer Science State University of New York at Binghamton Web Site: http://cs.binghamton.edu/~zzhang ------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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