Yes, 16k on x64 and arm64 android. On Tue, Sep 16, 2025 at 6:53 PM 'Mati Cohen' via v8-users <v8-users@googlegroups.com> wrote: > > I'm willing to recompile the latest stable version. I am looking at > build_config.h and for it's using the following implementation: > > #if (defined(V8_OS_MACOS) && defined(V8_HOST_ARCH_ARM64)) || \ > (defined(V8_OS_ANDROID) && \ > (defined(V8_HOST_ARCH_ARM64) || defined(V8_HOST_ARCH_X64))) || \ > defined(V8_HOST_ARCH_LOONG64) || defined(V8_HOST_ARCH_MIPS64) || \ > defined(V8_OS_IOS) > // Android 64 bit has experimental support for 16kB pages. > // MacOS & iOS on arm64 uses 16kB pages. > // LOONG64 and MIPS64 also use 16kB pages. > constexpr int kMinimumOSPageSize = 16 * 1024; > #elif defined(V8_OS_LINUX) && !defined(V8_OS_ANDROID) && \ > (defined(V8_HOST_ARCH_ARM64) || defined(V8_HOST_ARCH_PPC64)) > // Linux on arm64 (excluding android) and PPC64 can be configured for up to > 64kB > // pages. > constexpr int kMinimumOSPageSize = 64 * 1024; > #else > // Everything else uses 4kB pages. > constexpr int kMinimumOSPageSize = 4 * 1024; > #endif > > Sorry for my ignorance, but does it mean that all Android devices with > arm64-v8a and x86_64 architectures will use a size of 16KB. Is this correct? > I am trying to understand if there are devices with arm64-v8a and x86_64 > architectures which still use 4KB for page sizes. > > Thanks, > Matias. > > On Saturday, September 13, 2025 at 7:17:56 AM UTC-4 Ben Noordhuis wrote: >> >> Assuming recompiling is not a problem for you: just edit >> build_config.h and change it to 16k. >> >> IIRC, stdout and stderr are not normally hooked up to anything on >> Android but it should be possible to freopen them to a log file. >> >> On Fri, Sep 12, 2025 at 4:15 PM 'Matias Cohen' via v8-users >> <v8-u...@googlegroups.com> wrote: >> > >> > Thanks Ben. >> > >> > Yeah, that’s strange. I also noticed that SetDataReadOnly didn’t exist in >> > 10.4.132. Moreover, the V8_FATAL exception that is raised was added even >> > later. Maybe my records about 10.4.132 are wrong, but I am sure that we >> > built v8 last time in August 2022, so I can’t explain it. >> > >> > Android Studio don’t show any error message more than the stacktrace I >> > already shared. >> > >> > My guess is that kMinimumOSPageSize was still 4KB for Android back then >> > when I built v8 (yet I can’t explain why SetDataReadOnly is part of the >> > stacktrace). >> > >> > Is there any way for me to overwrite kMinimumOSPageSize from “outside” v8, >> > just to test if that makes a difference? >> > >> > Thanks! >> > >> > > On Sep 12, 2025, at 5:20 AM, Ben Noordhuis <in...@bnoordhuis.nl> wrote: >> > > >> > > On Fri, Sep 12, 2025 at 8:26 AM 'Mati Cohen' via v8-users >> > > <v8-u...@googlegroups.com> wrote: >> > >> >> > >> Hi, >> > >> >> > >> My app is using v8 to run a JS environment. Last time I built v8 was >> > >> about 3 years ago by pointing to 10.4.132. >> > >> >> > >> As per Google policy, my app needs to support 16 KB page size and I've >> > >> been checking all my dependencies to meet that criteria. >> > >> >> > >> Apparently, based on my checks, my v8 build does support it and I >> > >> managed to run the app on my device. >> > >> However, v8 is crashing as soon as I call V8::Initialize(); with the >> > >> following stack trace: >> > >> >> > >> /base.apk!liben8.so (offset 0x8ad8000) (v8::base::OS::Abort()+28) >> > >> /base.apk!liben8.so (offset 0x8ad8000) (V8_Fatal(char const*, ...)+376) >> > >> /base.apk!liben8.so (offset 0x8ad8000) >> > >> (v8::base::OS::SetDataReadOnly(void*, unsigned long)+52) >> > >> /base.apk!liben8.so (offset 0x8ad8000) >> > >> (v8::internal::V8::Initialize()+1552) >> > >> /base.apk!liben8.so (offset 0x8ad8000) (v8::V8::Initialize(int)+28) >> > >> /base.apk!liben8.so (offset 0x8ad8000) (Runtime::Runtime(_JNIEnv*)+172) >> > >> >> > >> As explained at >> > >> https://www.google.com/url?q=https://developer.android.com/guide/practices/page-sizes%23check-code&source=gmail-imap&ust=1758273654000000&usg=AOvVaw2eBFhXRa0E0P-iWsikoJCW, >> > >> I was trying to look for references to PAGE_SIZE and 4096 to see if I >> > >> was setting up something wrong, but I didn't find anything. >> > >> >> > >> Does anyone have any knowledge about this? >> > >> Thanks a lot, >> > >> Mati >> > > >> > > V8 doesn't use PAGE_SIZE, it uses sysconf(_SC_PAGESIZE). >> > > >> > > You mention 10.4.132 but that stack trace is from a different version, >> > > isn't it? Because SetDataReadOnly didn't exist back then. >> > > >> > > It crashes when trying to mprotect(PROT_READ) the command line flags, >> > > v8_flags. v8_flags is aligned to kMinimumOSPageSize and that _should_ >> > > be 16k on Android but you'll want to double-check that. It's defined >> > > in src/base/build_config.h. >> > > >> > > What error message did V8 print? >> > > >> > > -- >> > > -- >> > > v8-users mailing list >> > > v8-u...@googlegroups.com >> > > https://www.google.com/url?q=http://groups.google.com/group/v8-users&source=gmail-imap&ust=1758273654000000&usg=AOvVaw3Vi2w6FFQXBkM9c-JZXWPp >> > > --- >> > > You received this message because you are subscribed to a topic in the >> > > Google Groups "v8-users" group. >> > > To unsubscribe from this topic, visit >> > > https://www.google.com/url?q=https://groups.google.com/d/topic/v8-users/7XDxoIaXdV4/unsubscribe&source=gmail-imap&ust=1758273654000000&usg=AOvVaw0flrzsS8NN-9t4czOPfrqp. >> > > To unsubscribe from this group and all its topics, send an email to >> > > v8-users+u...@googlegroups.com. >> > > To view this discussion visit >> > > https://www.google.com/url?q=https://groups.google.com/d/msgid/v8-users/CAHQurc-SN0whK9Y3U8%253DSEdMPOVJLfhQ7fVPcqUi_kAjDJywGeQ%2540mail.gmail.com&source=gmail-imap&ust=1758273654000000&usg=AOvVaw0W3G7qAhJMvkfEdoop6uqR. >> > >> > -- >> > -- >> > v8-users mailing list >> > v8-u...@googlegroups.com >> > http://groups.google.com/group/v8-users >> > --- >> > You received this message because you are subscribed to the Google Groups >> > "v8-users" group. >> > To unsubscribe from this group and stop receiving emails from it, send an >> > email to v8-users+u...@googlegroups.com. >> > To view this discussion visit >> > https://groups.google.com/d/msgid/v8-users/D27EC591-82E7-43AB-B309-D7D01E9B3123%40encircleapp.com. > > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/v8-users/759c5f1b-0824-4a79-917a-07acab42f7aan%40googlegroups.com.
-- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/v8-users/CAHQurc9s4xM%2B-XtE4h_JcSEePN6wmP7Xob2v2JLGr3MZvdXksQ%40mail.gmail.com.
