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Update a comment. The sending process has not mapped the buffer pages

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since before r127501.  Strictly speaking, the buffer pages are not
"wired".  They remain in the paging queues.  However, they are pinned in
memory using vm_page_hold().
This commit is contained in:
Alan Cox 2011-03-20 15:04:43 +00:00
parent e1c9ab494d
commit 09a196a7de
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=219801
1 changed files with 3 additions and 3 deletions
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6
sys/kern/sys_pipe.c
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@ -29,9 +29,9 @@
* write mode. The small write mode acts like conventional pipes with
* a kernel buffer. If the buffer is less than PIPE_MINDIRECT, then the
* "normal" pipe buffering is done. If the buffer is between PIPE_MINDIRECT
* and PIPE_SIZE in size, it is fully mapped and wired into the kernel, and
* the receiving process can copy it directly from the pages in the sending
* process.
* and PIPE_SIZE in size, the sending process pins the underlying pages in
* memory, and the receiving process copies directly from these pinned pages
* in the sending process.
*
* If the sending process receives a signal, it is possible that it will
* go away, and certainly its address space can change, because control