On 07/29/2014 05:38, Slawa Olhovchenkov wrote: > On Sat, Jul 26, 2014 at 06:10:18PM +0000, Alan Cox wrote: > >> Author: alc >> Date: Sat Jul 26 18:10:18 2014 >> New Revision: 269134 >> URL: http://svnweb.freebsd.org/changeset/base/269134 >> >> Log: >> When unwiring a region of an address space, do not assume that the >> underlying physical pages are mapped by the pmap. If, for example, the >> application has performed an mprotect(..., PROT_NONE) on any part of the >> wired region, then those pages will no longer be mapped by the pmap. >> So, using the pmap to lookup the wired pages in order to unwire them >> doesn't always work, and when it doesn't work wired pages are leaked. >> >> To avoid the leak, introduce and use a new function vm_object_unwire() >> that locates the wired pages by traversing the object and its backing >> objects. > MFC planed?
At some point, yes. However, I'm not sure that it will be MFCed in time for 10.1. >> At the same time, switch from using pmap_change_wiring() to the recently >> introduced function pmap_unwire() for unwiring the region's mappings. >> pmap_unwire() is faster, because it operates a range of virtual addresses >> rather than a single virtual page at a time. Moreover, by operating on >> a range, it is superpage friendly. It doesn't waste time performing >> unnecessary demotions. >> >> Reported by: markj >> Reviewed by: kib >> Tested by: pho, jmg (arm) >> Sponsored by: EMC / Isilon Storage Division > _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
