From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- include/trace/events/migrate.h | 148 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) create mode 100644 include/trace/events/migrate.h (limited to 'include/trace/events/migrate.h') diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h new file mode 100644 index 000000000..15ee2ef20 --- /dev/null +++ b/include/trace/events/migrate.h @@ -0,0 +1,148 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM migrate + +#if !defined(_TRACE_MIGRATE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_MIGRATE_H + +#include + +#define MIGRATE_MODE \ + EM( MIGRATE_ASYNC, "MIGRATE_ASYNC") \ + EM( MIGRATE_SYNC_LIGHT, "MIGRATE_SYNC_LIGHT") \ + EMe(MIGRATE_SYNC, "MIGRATE_SYNC") + + +#define MIGRATE_REASON \ + EM( MR_COMPACTION, "compaction") \ + EM( MR_MEMORY_FAILURE, "memory_failure") \ + EM( MR_MEMORY_HOTPLUG, "memory_hotplug") \ + EM( MR_SYSCALL, "syscall_or_cpuset") \ + EM( MR_MEMPOLICY_MBIND, "mempolicy_mbind") \ + EM( MR_NUMA_MISPLACED, "numa_misplaced") \ + EM( MR_CONTIG_RANGE, "contig_range") \ + EM( MR_LONGTERM_PIN, "longterm_pin") \ + EM( MR_DEMOTION, "demotion") \ + EM( MR_DAMON, "damon") \ + EMe(MR_NEVER, "never_migrated") + +/* + * First define the enums in the above macros to be exported to userspace + * via TRACE_DEFINE_ENUM(). + */ +#undef EM +#undef EMe +#define EM(a, b) TRACE_DEFINE_ENUM(a); +#define EMe(a, b) TRACE_DEFINE_ENUM(a); + +MIGRATE_MODE +MIGRATE_REASON + +/* + * Now redefine the EM() and EMe() macros to map the enums to the strings + * that will be printed in the output. + */ +#undef EM +#undef EMe +#define EM(a, b) {a, b}, +#define EMe(a, b) {a, b} + +TRACE_EVENT(mm_migrate_pages, + + TP_PROTO(unsigned long succeeded, unsigned long failed, + unsigned long thp_succeeded, unsigned long thp_failed, + unsigned long thp_split, unsigned long large_folio_split, + enum migrate_mode mode, enum migrate_reason reason), + + TP_ARGS(succeeded, failed, thp_succeeded, thp_failed, + thp_split, large_folio_split, mode, reason), + + TP_STRUCT__entry( + __field( unsigned long, succeeded) + __field( unsigned long, failed) + __field( unsigned long, thp_succeeded) + __field( unsigned long, thp_failed) + __field( unsigned long, thp_split) + __field( unsigned long, large_folio_split) + __field( enum migrate_mode, mode) + __field( enum migrate_reason, reason) + ), + + TP_fast_assign( + __entry->succeeded = succeeded; + __entry->failed = failed; + __entry->thp_succeeded = thp_succeeded; + __entry->thp_failed = thp_failed; + __entry->thp_split = thp_split; + __entry->large_folio_split = large_folio_split; + __entry->mode = mode; + __entry->reason = reason; + ), + + TP_printk("nr_succeeded=%lu nr_failed=%lu nr_thp_succeeded=%lu nr_thp_failed=%lu nr_thp_split=%lu nr_split=%lu mode=%s reason=%s", + __entry->succeeded, + __entry->failed, + __entry->thp_succeeded, + __entry->thp_failed, + __entry->thp_split, + __entry->large_folio_split, + __print_symbolic(__entry->mode, MIGRATE_MODE), + __print_symbolic(__entry->reason, MIGRATE_REASON)) +); + +TRACE_EVENT(mm_migrate_pages_start, + + TP_PROTO(enum migrate_mode mode, enum migrate_reason reason), + + TP_ARGS(mode, reason), + + TP_STRUCT__entry( + __field(enum migrate_mode, mode) + __field(enum migrate_reason, reason) + ), + + TP_fast_assign( + __entry->mode = mode; + __entry->reason = reason; + ), + + TP_printk("mode=%s reason=%s", + __print_symbolic(__entry->mode, MIGRATE_MODE), + __print_symbolic(__entry->reason, MIGRATE_REASON)) +); + +DECLARE_EVENT_CLASS(migration_pte, + + TP_PROTO(unsigned long addr, unsigned long pte, int order), + + TP_ARGS(addr, pte, order), + + TP_STRUCT__entry( + __field(unsigned long, addr) + __field(unsigned long, pte) + __field(int, order) + ), + + TP_fast_assign( + __entry->addr = addr; + __entry->pte = pte; + __entry->order = order; + ), + + TP_printk("addr=%lx, pte=%lx order=%d", __entry->addr, __entry->pte, __entry->order) +); + +DEFINE_EVENT(migration_pte, set_migration_pte, + TP_PROTO(unsigned long addr, unsigned long pte, int order), + TP_ARGS(addr, pte, order) +); + +DEFINE_EVENT(migration_pte, remove_migration_pte, + TP_PROTO(unsigned long addr, unsigned long pte, int order), + TP_ARGS(addr, pte, order) +); + +#endif /* _TRACE_MIGRATE_H */ + +/* This part must be outside protection */ +#include -- cgit v1.3.1