On Thu, Mar 19, 2015 at 06:36:54PM +0300, Konstantin Khlebnikov wrote: > > Assme process has vma in region 4096-8192, one page size, mapped to > > a file's first 4096 bytes, then a new map want to create vma in range > > 0-8192 to map 4096-1288 in file, please tell me what's your meaning: > > "so everything what was here before is unmapped in process"? > > > > Why we can just delete old vma for first 4096 size in file which reside > > in range 4096-8192 without notify user process? And create the new vma > > to occupy range 0-8192, do you think "everything" is really the same? > > Old and new vmas are intersects? Then that means userpace asked to > create new mapping at fixed address, so it tells kernel to unmap > everything in that range. Without MAP_FIXED kernel always choose free area. > Thanks, Konstantin Khlebnikov, you cure my headache :) I haven't notice MAP_FIXED. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>