On Dez 22 2016, Minchan Kim <minchan@xxxxxxxxxx> wrote: > From b3ec95c0df91ad113525968a4a6b53030fd0b48d Mon Sep 17 00:00:00 2001 > From: Minchan Kim <minchan@xxxxxxxxxx> > Date: Thu, 22 Dec 2016 23:43:49 +0900 > Subject: [PATCH v2] mm: pmd dirty emulation in page fault handler > > Andreas reported [1] made a test in jemalloc hang in THP mode in arm64. > http://lkml.kernel.org/r/mvmmvfy37g1.fsf@xxxxxxxxxxxxxxx > > The problem is page fault handler supports only accessed flag emulation > for THP page of SW-dirty/accessed architecture. > > This patch enables dirty-bit emulation for those architectures. > Without it, MADV_FREE makes application hang by repeated fault forever. > > [1] b8d3c4c3009d, mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called Successfully tested a backport to 4.9. Andreas. -- Andreas Schwab, SUSE Labs, schwab@xxxxxxx GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different." -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
