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authorHaifeng Xu <haifeng.xu@shopee.com>2023-05-08 09:44:58 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-06-10 03:44:13 +0300
commit4e2f6342ccaf9d8beb33b398cc2862769c7d2a3b (patch)
tree040886ae0f0b89c4c81c0aed89f69c750bf7d33f /tools/perf/scripts/python/export-to-postgresql.py
parent3db55767da7427cebc49e22b25b5f50ff455add6 (diff)
downloadlinux-4e2f6342ccaf9d8beb33b398cc2862769c7d2a3b.tar.xz
fork: optimize memcg_charge_kernel_stack() a bit
Since commit f1c1a9ee00e4 ("fork: Move memcg_charge_kernel_stack() into CONFIG_VMAP_STACK"), memcg_charge_kernel_stack() has been moved into CONFIG_VMAP_STACK block, so the CONFIG_VMAP_STACK check can be removed. Furthermore, memcg_charge_kernel_stack() is only invoked by alloc_thread_stack_node() instead of dup_task_struct(). If memcg_kmem_charge_page() fails, the uncharge process is handled in memcg_charge_kernel_stack() itself instead of free_thread_stack(), so remove the incorrect comments. If memcg_charge_kernel_stack() fails to charge pages used by kernel stack, only charged pages need to be uncharged. It's unnecessary to uncharge those pages which memory cgroup pointer is NULL. [akpm@linux-foundation.org: remove assertion that PAGE_SIZE is a multiple of 1k] Link: https://lkml.kernel.org/r/20230508064458.32855-1-haifeng.xu@shopee.com Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Daniel Bristot de Oliveira <bristot@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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