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Date: Fri, 11 Mar 2016 16:27:19 +0100 From: Vlastimil Babka <vbabka@...e.cz> To: Michal Hocko <mhocko@...nel.org>, LKML <linux-kernel@...r.kernel.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, Alex Deucher <alexander.deucher@....com>, Alex Thorlton <athorlton@....com>, Andrea Arcangeli <aarcange@...hat.com>, Andy Lutomirski <luto@...capital.net>, Benjamin LaHaise <bcrl@...ck.org>, Christian König <christian.koenig@....com>, Daniel Vetter <daniel.vetter@...el.com>, Dave Hansen <dave.hansen@...ux.intel.com>, David Airlie <airlied@...ux.ie>, Davidlohr Bueso <dave@...olabs.net>, David Rientjes <rientjes@...gle.com>, "H . Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>, Ingo Molnar <mingo@...nel.org>, Johannes Weiner <hannes@...xchg.org>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Konstantin Khlebnikov <koct9i@...il.com>, linux-arch@...r.kernel.org, Mel Gorman <mgorman@...e.de>, Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Petr Cermak <petrcermak@...omium.org>, Thomas Gleixner <tglx@...utronix.de>, Michal Hocko <mhocko@...e.com> Subject: Re: [PATCH 17/18] drm/radeon: make radeon_mn_get wait for mmap_sem killable On 02/29/2016 02:26 PM, Michal Hocko wrote: > From: Michal Hocko <mhocko@...e.com> > > radeon_mn_get which is called during ioct path relies on mmap_sem for > write. If the waiting task gets killed by the oom killer it would block > oom_reaper from asynchronous address space reclaim and reduce the > chances of timely OOM resolving. Wait for the lock in the killable mode > and return with EINTR if the task got killed while waiting. > > Cc: Alex Deucher <alexander.deucher@....com> > Cc: "Christian König" <christian.koenig@....com> > Cc: David Airlie <airlied@...ux.ie> > Signed-off-by: Michal Hocko <mhocko@...e.com> Acked-by: Vlastimil Babka <vbabka@...e.cz> > --- > drivers/gpu/drm/radeon/radeon_mn.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c > index eef006c48584..896f2cf51e4e 100644 > --- a/drivers/gpu/drm/radeon/radeon_mn.c > +++ b/drivers/gpu/drm/radeon/radeon_mn.c > @@ -186,7 +186,9 @@ static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) > struct radeon_mn *rmn; > int r; > > - down_write(&mm->mmap_sem); > + if (down_write_killable(&mm->mmap_sem)) > + return ERR_PTR(-EINTR); > + > mutex_lock(&rdev->mn_lock); > > hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) >
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