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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"">
kernelnewbies-bounces+jharan=bytemobile.com@kernelnewbies.org [mailto:kernelnewbies-bounces+jharan=bytemobile.com@kernelnewbies.org]
<b><span style="font-weight:bold">On Behalf Of </span></b>Manavendra Nath Manav<br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, September 09, 2014 6:24 AM<br>
<b><span style="font-weight:bold">To:</span></b> kernelnewbies@kernelnewbies.org; feedback@elinuxdd.com<br>
<b><span style="font-weight:bold">Subject:</span></b> Page fault in kernel code<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">While reading the book Essential Linux device drivers it says "user mode code is allowed to page fault, however, whereas kernel mode code isn't".<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Why is it so? Why can't kernel mode code handle the page fault and reload the page from swap? Also, can page fault occur when kernel is executing in process context and/or interrupt context?<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">-- <span class="SpellE">
manav</span> m-n<o:p></o:p></span></font></p>
<p><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">Think about handling the case where a page fault has occurred but the code that handles the
page fault is itself not already in RAM, which leads to another page fault. Gets complicated. That complexity can be avoided by keeping all the kernel code in RAM all the time. Same applies to the kernel data that is needed to handle a page fault.<o:p></o:p></span></font></p>
<p><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">Jeff Haran<o:p></o:p></span></font></p>
<p><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
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