[PATCH v5 12/12] drm/xe: Increase the XE_PL_TT watermark
Thomas Hellström
thomas.hellstrom at linux.intel.com
Tue Jun 18 07:32:03 UTC 2024
The XE_PL_TT watermark was set to 50% of system memory.
The idea behind that was unclear since the net effect is that
TT memory will be evicted to TTM_PL_SYSTEM memory if that
watermark is exceeded, requiring PPGTT rebinds and dma
remapping. But there is no similar watermark for TTM_PL_SYSTEM
memory.
The TTM functionality that tries to swap out system memory to
shmem objects if a 50% limit of total system memory is reached
is orthogonal to this, and with the shrinker added, it's no
longer in effect.
Replace the 50% TTM_PL_TT limit with a 100% limit, in effect
allowing all graphics memory to be bound to the device unless it
has been swapped out by the shrinker.
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
drivers/gpu/drm/xe/xe_ttm_sys_mgr.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
index 9844a8edbfe1..d38b91872da3 100644
--- a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
+++ b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
@@ -108,9 +108,8 @@ int xe_ttm_sys_mgr_init(struct xe_device *xe)
u64 gtt_size;
si_meminfo(&si);
+ /* Potentially restrict amount of TT memory here. */
gtt_size = (u64)si.totalram * si.mem_unit;
- /* TTM limits allocation of all TTM devices by 50% of system memory */
- gtt_size /= 2;
man->use_tt = true;
man->func = &xe_ttm_sys_mgr_func;
--
2.44.0
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