[Mesa-dev] [PATCH 2/3] llvmpipe: Cap to 2 GB on 32 bits

[Axel Davy]

On 32 bits system, application memory is quite limited.
llvmpipe uses application memory. To help prevent memory
exhaustion, limit reported memory availability to 2GB.

Some gallium nine apps do check reported memory by allocating
resources until memory is full. Gallium nine refuses allocations
when 80% of the reported memory limit is used. This change
helps some apps to start.

Signed-off-by: Axel Davy <axel.davy at ens.fr>
---
 src/gallium/drivers/llvmpipe/lp_screen.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index 18837a2..9a0a1a2 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -280,6 +280,12 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
       if (!os_get_total_physical_memory(&system_memory))
          return 0;
 
+      if (sizeof(void *) == 4)
+         /* Cap to 2 GB on 32 bits system. We do this because llvmpipe does
+          * eat application memory, which is quite limited on 32 bits. App
+          * shouldn't expect too much available memory. */
+         system_memory = MIN2(system_memory, 2048 << 20);
+
       return (int)(system_memory >> 20);
    }
    case PIPE_CAP_UMA:
-- 
2.10.0