Date: Fri, 23 Feb 2001 15:37:34 -0500 From: "Sue Wainer" <wainer@sandgate.com> To: <hackers@freebsd.org> Subject: RE: Memory Alloation from kernel loadable driver Message-ID: <NDBBLIBAPKIAHMINJJNFOEJFCEAA.wainer@sandgate.com> In-Reply-To: <NDBBLIBAPKIAHMINJJNFIEJFCEAA.wainer@sandgate.com>
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[-- Attachment #1 --] I have a pci driver which is loaded using kldload. It is allocating a no. of pages by calling vm_page_alloc_contig. This convention is used by other pci drivers, though not necessarily loadable ones. On machines without much memory, or ones with more memory but having done compilations prior to kldloading, contigmalloc1 gets stuck in a continuous loop looping from the first "goto again1." There is a comment above configmalloc1 which might imply that this contiguous allocation does not work after initialization. For locked-down memory, what allocation routines should loadable drivers be calling? Is there any source of documentation of memory allocation which could be of value? Thanks. Sue Wainer wainer@sandgate.com [-- Attachment #2 --] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META content="MSHTML 5.00.2722.2800" name=GENERATOR></HEAD> <BODY> <DIV> </DIV> <BLOCKQUOTE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"> <DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma size=2> </DIV></FONT> <DIV><FONT size=2><SPAN class=395142517-23022001>I have a pci driver which is loaded using kldload. It is allocating a no. of pages by calling </SPAN></FONT><FONT size=2><SPAN class=395142517-23022001>vm_page_alloc_contig.</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>This convention is used by other pci drivers, though not necessarily loadable ones.</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001></SPAN></FONT> </DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>On machines without much memory, or ones with more memory but having done compilations prior to kldloading,</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>contigmalloc1 gets stuck in a continuous loop looping from the first "goto again1." There is a comment</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>above configmalloc1 which might imply that this contiguous allocation does not work after initialization.</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001></SPAN></FONT> </DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>For locked-down memory, what allocation routines should loadable drivers be calling? Is there any source of</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>documentation of memory allocation which could be of value?</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001></SPAN></FONT> </DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>Thanks.</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001></SPAN></FONT> </DIV> <DIV><FONT size=2><SPAN class=395142517-23022001>Sue Wainer</SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001><A href="mailto:wainer@sandgate.com">wainer@sandgate.com</A> </SPAN></FONT></DIV> <DIV><FONT size=2><SPAN class=395142517-23022001></SPAN></FONT> </DIV> <DIV><FONT size=2><SPAN class=395142517-23022001></SPAN></FONT> </DIV></BLOCKQUOTE></BODY></HTML>help
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