its user-level registers until it resumes, and the underlying kernel thread must also store its own kernel-level registers.

Performance

LWPs are slower and more expensive to create than user threads. Whenever an LWP is created, a system call must first be made to create a corresponding kernel thread, causing a switch to kernel mode. These mode switches would typically involve copying parameters between kernel and user space, also the kernel may need to have extra steps to verify the parameters

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