From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- include/trace/events/kmem.h | 464 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 464 insertions(+) create mode 100644 include/trace/events/kmem.h (limited to 'include/trace/events/kmem.h') diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h new file mode 100644 index 000000000..cd7920c81 --- /dev/null +++ b/include/trace/events/kmem.h @@ -0,0 +1,464 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM kmem + +#if !defined(_TRACE_KMEM_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_KMEM_H + +#include +#include +#include + +TRACE_EVENT(kmem_cache_alloc, + + TP_PROTO(unsigned long call_site, + const void *ptr, + struct kmem_cache *s, + gfp_t gfp_flags, + int node), + + TP_ARGS(call_site, ptr, s, gfp_flags, node), + + TP_STRUCT__entry( + __field( unsigned long, call_site ) + __field( const void *, ptr ) + __string( name, s->name ) + __field( size_t, bytes_req ) + __field( size_t, bytes_alloc ) + __field( unsigned long, gfp_flags ) + __field( int, node ) + __field( bool, accounted ) + ), + + TP_fast_assign( + __entry->call_site = call_site; + __entry->ptr = ptr; + __assign_str(name); + __entry->bytes_req = s->object_size; + __entry->bytes_alloc = s->size; + __entry->gfp_flags = (__force unsigned long)gfp_flags; + __entry->node = node; + __entry->accounted = IS_ENABLED(CONFIG_MEMCG) ? + ((gfp_flags & __GFP_ACCOUNT) || + (s->flags & SLAB_ACCOUNT)) : false; + ), + + TP_printk("call_site=%pS ptr=%p name=%s bytes_req=%zu bytes_alloc=%zu gfp_flags=%s node=%d accounted=%s", + (void *)__entry->call_site, + __entry->ptr, + __get_str(name), + __entry->bytes_req, + __entry->bytes_alloc, + show_gfp_flags(__entry->gfp_flags), + __entry->node, + __entry->accounted ? "true" : "false") +); + +TRACE_EVENT(kmalloc, + + TP_PROTO(unsigned long call_site, + const void *ptr, + size_t bytes_req, + size_t bytes_alloc, + gfp_t gfp_flags, + int node), + + TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags, node), + + TP_STRUCT__entry( + __field( unsigned long, call_site ) + __field( const void *, ptr ) + __field( size_t, bytes_req ) + __field( size_t, bytes_alloc ) + __field( unsigned long, gfp_flags ) + __field( int, node ) + ), + + TP_fast_assign( + __entry->call_site = call_site; + __entry->ptr = ptr; + __entry->bytes_req = bytes_req; + __entry->bytes_alloc = bytes_alloc; + __entry->gfp_flags = (__force unsigned long)gfp_flags; + __entry->node = node; + ), + + TP_printk("call_site=%pS ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s node=%d accounted=%s", + (void *)__entry->call_site, + __entry->ptr, + __entry->bytes_req, + __entry->bytes_alloc, + show_gfp_flags(__entry->gfp_flags), + __entry->node, + (IS_ENABLED(CONFIG_MEMCG) && + (__entry->gfp_flags & (__force unsigned long)__GFP_ACCOUNT)) ? "true" : "false") +); + +TRACE_EVENT(kfree, + + TP_PROTO(unsigned long call_site, const void *ptr), + + TP_ARGS(call_site, ptr), + + TP_STRUCT__entry( + __field( unsigned long, call_site ) + __field( const void *, ptr ) + ), + + TP_fast_assign( + __entry->call_site = call_site; + __entry->ptr = ptr; + ), + + TP_printk("call_site=%pS ptr=%p", + (void *)__entry->call_site, __entry->ptr) +); + +TRACE_EVENT(kmem_cache_free, + + TP_PROTO(unsigned long call_site, const void *ptr, const struct kmem_cache *s), + + TP_ARGS(call_site, ptr, s), + + TP_STRUCT__entry( + __field( unsigned long, call_site ) + __field( const void *, ptr ) + __string( name, s->name ) + ), + + TP_fast_assign( + __entry->call_site = call_site; + __entry->ptr = ptr; + __assign_str(name); + ), + + TP_printk("call_site=%pS ptr=%p name=%s", + (void *)__entry->call_site, __entry->ptr, __get_str(name)) +); + +TRACE_EVENT(mm_page_free, + + TP_PROTO(struct page *page, unsigned int order), + + TP_ARGS(page, order), + + TP_STRUCT__entry( + __field( unsigned long, pfn ) + __field( unsigned int, order ) + ), + + TP_fast_assign( + __entry->pfn = page_to_pfn(page); + __entry->order = order; + ), + + TP_printk("page=%p pfn=0x%lx order=%d", + pfn_to_page(__entry->pfn), + __entry->pfn, + __entry->order) +); + +TRACE_EVENT(mm_page_free_batched, + + TP_PROTO(struct page *page), + + TP_ARGS(page), + + TP_STRUCT__entry( + __field( unsigned long, pfn ) + ), + + TP_fast_assign( + __entry->pfn = page_to_pfn(page); + ), + + TP_printk("page=%p pfn=0x%lx order=0", + pfn_to_page(__entry->pfn), + __entry->pfn) +); + +TRACE_EVENT(mm_page_alloc, + + TP_PROTO(struct page *page, unsigned int order, + gfp_t gfp_flags, int migratetype), + + TP_ARGS(page, order, gfp_flags, migratetype), + + TP_STRUCT__entry( + __field( unsigned long, pfn ) + __field( unsigned int, order ) + __field( unsigned long, gfp_flags ) + __field( int, migratetype ) + ), + + TP_fast_assign( + __entry->pfn = page ? page_to_pfn(page) : -1UL; + __entry->order = order; + __entry->gfp_flags = (__force unsigned long)gfp_flags; + __entry->migratetype = migratetype; + ), + + TP_printk("page=%p pfn=0x%lx order=%d migratetype=%d gfp_flags=%s", + __entry->pfn != -1UL ? pfn_to_page(__entry->pfn) : NULL, + __entry->pfn != -1UL ? __entry->pfn : 0, + __entry->order, + __entry->migratetype, + show_gfp_flags(__entry->gfp_flags)) +); + +DECLARE_EVENT_CLASS(mm_page, + + TP_PROTO(struct page *page, unsigned int order, int migratetype, + int percpu_refill), + + TP_ARGS(page, order, migratetype, percpu_refill), + + TP_STRUCT__entry( + __field( unsigned long, pfn ) + __field( unsigned int, order ) + __field( int, migratetype ) + __field( int, percpu_refill ) + ), + + TP_fast_assign( + __entry->pfn = page ? page_to_pfn(page) : -1UL; + __entry->order = order; + __entry->migratetype = migratetype; + __entry->percpu_refill = percpu_refill; + ), + + TP_printk("page=%p pfn=0x%lx order=%u migratetype=%d percpu_refill=%d", + __entry->pfn != -1UL ? pfn_to_page(__entry->pfn) : NULL, + __entry->pfn != -1UL ? __entry->pfn : 0, + __entry->order, + __entry->migratetype, + __entry->percpu_refill) +); + +DEFINE_EVENT(mm_page, mm_page_alloc_zone_locked, + + TP_PROTO(struct page *page, unsigned int order, int migratetype, + int percpu_refill), + + TP_ARGS(page, order, migratetype, percpu_refill) +); + +TRACE_EVENT(mm_page_pcpu_drain, + + TP_PROTO(struct page *page, unsigned int order, int migratetype), + + TP_ARGS(page, order, migratetype), + + TP_STRUCT__entry( + __field( unsigned long, pfn ) + __field( unsigned int, order ) + __field( int, migratetype ) + ), + + TP_fast_assign( + __entry->pfn = page ? page_to_pfn(page) : -1UL; + __entry->order = order; + __entry->migratetype = migratetype; + ), + + TP_printk("page=%p pfn=0x%lx order=%d migratetype=%d", + pfn_to_page(__entry->pfn), __entry->pfn, + __entry->order, __entry->migratetype) +); + +TRACE_EVENT(mm_page_alloc_extfrag, + + TP_PROTO(struct page *page, + int alloc_order, int fallback_order, + int alloc_migratetype, int fallback_migratetype), + + TP_ARGS(page, + alloc_order, fallback_order, + alloc_migratetype, fallback_migratetype), + + TP_STRUCT__entry( + __field( unsigned long, pfn ) + __field( int, alloc_order ) + __field( int, fallback_order ) + __field( int, alloc_migratetype ) + __field( int, fallback_migratetype ) + __field( int, change_ownership ) + ), + + TP_fast_assign( + __entry->pfn = page_to_pfn(page); + __entry->alloc_order = alloc_order; + __entry->fallback_order = fallback_order; + __entry->alloc_migratetype = alloc_migratetype; + __entry->fallback_migratetype = fallback_migratetype; + __entry->change_ownership = (alloc_migratetype == + get_pageblock_migratetype(page)); + ), + + TP_printk("page=%p pfn=0x%lx alloc_order=%d fallback_order=%d pageblock_order=%d alloc_migratetype=%d fallback_migratetype=%d fragmenting=%d change_ownership=%d", + pfn_to_page(__entry->pfn), + __entry->pfn, + __entry->alloc_order, + __entry->fallback_order, + pageblock_order, + __entry->alloc_migratetype, + __entry->fallback_migratetype, + __entry->fallback_order < pageblock_order, + __entry->change_ownership) +); + +TRACE_EVENT(mm_setup_per_zone_wmarks, + + TP_PROTO(struct zone *zone), + + TP_ARGS(zone), + + TP_STRUCT__entry( + __field(int, node_id) + __string(name, zone->name) + __field(unsigned long, watermark_min) + __field(unsigned long, watermark_low) + __field(unsigned long, watermark_high) + __field(unsigned long, watermark_promo) + ), + + TP_fast_assign( + __entry->node_id = zone->zone_pgdat->node_id; + __assign_str(name); + __entry->watermark_min = zone->_watermark[WMARK_MIN]; + __entry->watermark_low = zone->_watermark[WMARK_LOW]; + __entry->watermark_high = zone->_watermark[WMARK_HIGH]; + __entry->watermark_promo = zone->_watermark[WMARK_PROMO]; + ), + + TP_printk("node_id=%d zone name=%s watermark min=%lu low=%lu high=%lu promo=%lu", + __entry->node_id, + __get_str(name), + __entry->watermark_min, + __entry->watermark_low, + __entry->watermark_high, + __entry->watermark_promo) +); + +TRACE_EVENT(mm_setup_per_zone_lowmem_reserve, + + TP_PROTO(struct zone *zone, struct zone *upper_zone, long lowmem_reserve), + + TP_ARGS(zone, upper_zone, lowmem_reserve), + + TP_STRUCT__entry( + __field(int, node_id) + __string(name, zone->name) + __string(upper_name, upper_zone->name) + __field(long, lowmem_reserve) + ), + + TP_fast_assign( + __entry->node_id = zone->zone_pgdat->node_id; + __assign_str(name); + __assign_str(upper_name); + __entry->lowmem_reserve = lowmem_reserve; + ), + + TP_printk("node_id=%d zone name=%s upper_zone name=%s lowmem_reserve_pages=%ld", + __entry->node_id, + __get_str(name), + __get_str(upper_name), + __entry->lowmem_reserve) +); + +TRACE_EVENT(mm_calculate_totalreserve_pages, + + TP_PROTO(unsigned long totalreserve_pages), + + TP_ARGS(totalreserve_pages), + + TP_STRUCT__entry( + __field(unsigned long, totalreserve_pages) + ), + + TP_fast_assign( + __entry->totalreserve_pages = totalreserve_pages; + ), + + TP_printk("totalreserve_pages=%lu", __entry->totalreserve_pages) +); + + +/* + * Required for uniquely and securely identifying mm in rss_stat tracepoint. + */ +#ifndef __PTR_TO_HASHVAL +static unsigned int __maybe_unused mm_ptr_to_hash(const void *ptr) +{ + int ret; + unsigned long hashval; + + ret = ptr_to_hashval(ptr, &hashval); + if (ret) + return 0; + + /* The hashed value is only 32-bit */ + return (unsigned int)hashval; +} +#define __PTR_TO_HASHVAL +#endif + +#define TRACE_MM_PAGES \ + EM(MM_FILEPAGES) \ + EM(MM_ANONPAGES) \ + EM(MM_SWAPENTS) \ + EMe(MM_SHMEMPAGES) + +#undef EM +#undef EMe + +#define EM(a) TRACE_DEFINE_ENUM(a); +#define EMe(a) TRACE_DEFINE_ENUM(a); + +TRACE_MM_PAGES + +#undef EM +#undef EMe + +#define EM(a) { a, #a }, +#define EMe(a) { a, #a } + +TRACE_EVENT(rss_stat, + + TP_PROTO(struct mm_struct *mm, + int member), + + TP_ARGS(mm, member), + + TP_STRUCT__entry( + __field(unsigned int, mm_id) + __field(unsigned int, curr) + __field(int, member) + __field(long, size) + ), + + TP_fast_assign( + __entry->mm_id = mm_ptr_to_hash(mm); + /* + * curr is true if the mm matches the current task's mm_struct. + * Since kthreads (PF_KTHREAD) have no mm_struct of their own + * but can borrow one via kthread_use_mm(), we must filter them + * out to avoid incorrectly attributing the RSS update to them. + */ + __entry->curr = current->mm == mm && !(current->flags & PF_KTHREAD); + __entry->member = member; + __entry->size = (percpu_counter_sum_positive(&mm->rss_stat[member]) + << PAGE_SHIFT); + ), + + TP_printk("mm_id=%u curr=%d type=%s size=%ldB", + __entry->mm_id, + __entry->curr, + __print_symbolic(__entry->member, TRACE_MM_PAGES), + __entry->size) + ); +#endif /* _TRACE_KMEM_H */ + +/* This part must be outside protection */ +#include -- cgit v1.3.1