Support for large PT buffers (>=2G) #36
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Can you please create new ioctls for the 64bit variants and keep the old ones? There might be already existing users outside sptdump of the ioctl ABI/API which would be broken otherwise. Other than that the changes look good. Thanks. |
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This patch allows the use of large PT buffers. E.g., users can now configure 8GB pt buffer per- logical CPU by:
modprobe simple-pt pt_buffer_order=9 pt_num_buffers=4095
This would configure 4095 2MB output regions. We intentionally use 4095 rather than 4096 to save space on the ToPA pages (Last ToPA entry is for the END pointer)