STRUCT DRM_V3D_PERFMON_SET_GLOBAL(9)

💅 NAME 💅

ok so bestie, welcome to struct drm_v3d_perfmon_set_global — this is the ioctl you use to define a global performance monitor. that's it, that's the whole vibe ✨

oh and hey, you're reading the Kernel API Manual rn — welcome to the group chat 🫶

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✨ SYNOPSIS ✨

struct drm_v3d_perfmon_set_global {
    __u32 flags;
    __u32 id;
 };

bestie look at it. two little fields. immaculate. no cap 🎀

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🌸 Members 🌸

ok so this section on the original page is literally just the heading and nothing else — no members listed, no notes, just vibes and open space 💀 i'm not gonna make stuff up for you, so consider this your official "the page says nothing here" moment. go read the DESCRIPTION, that's where the actual tea is 🍓

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👑 DESCRIPTION 👑

ok so the tea: once you define a global performance monitor, it gets used for all jobs. every single one. main character monitor energy fr fr 👑

and here's the part you actually need to remember, bestie, because it's a real gotcha: if a global performance monitor is defined, then jobs that bring their own self-defined performance monitor won't be allowed. not "discouraged", not "mildly frowned upon" — not allowed. periodt. 💅

so like... pick one? global monitor OR per-job self-defined monitors. the kernel is not doing both for you and it is not asking twice 🫶

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🔥 SEE ALSO 🔥

go be nosy, the whole family is here:

• the kernel file ./include/uapi/drm/v3d_drm.h — that's where the source of truth lives
• struct drm_v3d_multi_sync(9)
• struct drm_v3d_submit_cl(9)
• struct drm_v3d_wait_bo(9)
• struct drm_v3d_create_bo(9)
• struct drm_v3d_mmap_bo(9)
• struct drm_v3d_indirect_csd(9)
• struct drm_v3d_timestamp_query(9)
• struct drm_v3d_reset_timestamp_query(9)
• struct drm_v3d_copy_timestamp_query(9)
• struct drm_v3d_reset_performance_query(9)
• struct drm_v3d_copy_performance_query(9)
• struct drm_v3d_perfmon_get_counter(9)

like genuinely obsessed with how long that list is, it's giving "linked in every direction" 🌈

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aaaand that's the whole page, bestie, you ate that 🍓 one last lil sign-off: this one ships from ./include/uapi/drm, dated October 2026, and it goes by the name struct drm_v3d_perfmon_set_global(9) 🎀✨ byeee 💖