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ANDROID: introduce a vendor hook to allow speculative swap pagefaults

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Since SPF is an out-of-tree feature, the risks of changing its behavior
are higher. Add a vendor hook to enable speculative swap pagefaults. By
default it's disabled and should not cause troubles for current users.

Bug: 322762567
Change-Id: I3df7c545aa27d2707ee51ea42368f785c5faa735
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan
2024-02-08 14:19:04 -08:00
parent 8014b372fb
commit eb7a469127
3 changed files with 13 additions and 4 deletions
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1
drivers/android/vendor_hooks.c
View File

@@ -389,3 +389,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_delayacct_freepages_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_delayacct_freepages_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_delayacct_thrashing_start);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_delayacct_thrashing_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_swap_page_spf);

3
include/trace/hooks/mm.h
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@@ -174,6 +174,9 @@ DECLARE_HOOK(android_vh_isolate_freepages,
DECLARE_HOOK(android_vh_ptep_clear_flush_young,
TP_PROTO(bool *skip),
TP_ARGS(skip));
DECLARE_HOOK(android_vh_do_swap_page_spf,
TP_PROTO(bool *allow_swap_spf),
TP_ARGS(allow_swap_spf));
#endif /* _TRACE_HOOK_MM_H */
/* This part must be outside protection */

13
mm/memory.c
View File

@@ -3720,12 +3720,17 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
void *shadow = NULL;
if (vmf->flags & FAULT_FLAG_SPECULATIVE) {
bool allow_swap_spf = false;
/* ksm_might_need_to_copy() needs a stable VMA, spf can't be used */
#ifdef CONFIG_KSM
pte_unmap(vmf->pte);
count_vm_spf_event(SPF_ABORT_SWAP);
return VM_FAULT_RETRY;
#ifndef CONFIG_KSM
trace_android_vh_do_swap_page_spf(&allow_swap_spf);
#endif
if (!allow_swap_spf) {
pte_unmap(vmf->pte);
count_vm_spf_event(SPF_ABORT_SWAP);
return VM_FAULT_RETRY;
}
}
if (!pte_unmap_same(vma->vm_mm, vmf->pmd, vmf->pte, vmf->orig_pte)) {