hulk inclusion category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8420 ------------------ Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- arch/x86/include/asm/resctrl.h | 7 +++++++ fs/resctrl/monitor.c | 27 +++++++++++++++++++++++++-- include/linux/arm_mpam.h | 16 ++++++++++++++++ 3 files changed, 48 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h index 406b4cf301bb..4a65eb19b2cf 100644 --- a/arch/x86/include/asm/resctrl.h +++ b/arch/x86/include/asm/resctrl.h @@ -181,6 +181,13 @@ static inline bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 ignored, return READ_ONCE(tsk->rmid) == rmid; } +static inline int resctrl_arch_expand_rmid(u32 closid) +{ + return -ENOSPC; +} + +static inline void resctrl_arch_shrink_rmid(u32 closid, u32 rmid) {} + static inline void resctrl_sched_in(struct task_struct *tsk) { if (static_branch_likely(&rdt_enable_key)) diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 034d426d24e4..6672f7ea91ae 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -115,6 +115,8 @@ static void limbo_release_entry(struct rmid_entry *entry) if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) closid_num_dirty_rmid[entry->closid]--; + + resctrl_arch_shrink_rmid(entry->closid, entry->rmid); } /* @@ -178,7 +180,7 @@ bool has_busy_rmid(struct rdt_domain *d) return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit; } -struct rmid_entry *resctrl_find_free_rmid(u32 closid) +struct rmid_entry *__resctrl_find_free_rmid(u32 closid) { struct rmid_entry *itr; u32 itr_idx, cmp_idx; @@ -204,6 +206,25 @@ struct rmid_entry *resctrl_find_free_rmid(u32 closid) return ERR_PTR(-ENOSPC); } +struct rmid_entry *resctrl_find_free_rmid(u32 closid) +{ + struct rmid_entry *err; + int ret; + + err = __resctrl_find_free_rmid(closid); + if (err == ERR_PTR(-ENOSPC)) { + ret = resctrl_arch_expand_rmid(closid); + if (ret < 0) + /* Out of rmid */ + goto out; + + /* Try it again */ + return __resctrl_find_free_rmid(closid); + } +out: + return err; +} + /** * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated * RMID are clean, or the CLOSID that has @@ -320,8 +341,10 @@ void free_rmid(u32 closid, u32 rmid) if (resctrl_arch_is_llc_occupancy_enabled()) add_rmid_to_limbo(entry); - else + else { list_add_tail(&entry->list, &rmid_free_lru); + resctrl_arch_shrink_rmid(closid, rmid); + } } bool rmid_is_occupied(u32 closid, u32 rmid) diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h index 3a06a8afad7c..cd46a7cb9df4 100644 --- a/include/linux/arm_mpam.h +++ b/include/linux/arm_mpam.h @@ -78,6 +78,22 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable); bool resctrl_arch_hide_cdp(enum resctrl_res_level rid); bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid); bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid); + +/** + * resctrl_arch_expand_rmid() - Expand the RMID resources for the specified closid. + * @closid: closid that matches the rmid. + * + * Return: + * 0 on success, or -ENOSPC etc on error. + */ +int resctrl_arch_expand_rmid(u32 closid); +/** + * resctrl_arch_expand_rmid() - Release the rmid resources for the specified closid. + * @closid: closid that matches the rmid. + * @rmid: Release the rmid specified. + */ +void resctrl_arch_shrink_rmid(u32 closid, u32 rmid); + void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid); void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid); void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg); -- 2.25.1