[Crash-utility] Re: [External Mail]Re: [BUG FIXED]fix bug of CACHED in kmem -i show memory

Hi Lianbo: the vmlinux i download from links: https://ci.android.com/builds/submitted/11087000/kernel_aarch64/latest?hl... <https://ci.android.com/builds/submitted/11087000/kernel_aarch64/latest?hl... md5sum ~/Downloads/vmlinux 5927b52ad342e6e34136b04b9d16ab46 vmlinux

can not get nr_swapper_spaces symbols Thanks! Best regards ------------------------------------------------------------------------ *From:* Lianbo Jiang <lijiang(a)redhat.com&gt; *Sent:* Wednesday, December 6, 2023 11:33:16 AM *To:* 薛国伦; HAGIO KAZUHITO(萩尾 一仁); devel(a)lists.crash-utility.osci.io *Subject:* Re: [External Mail]Re: [Crash-utility] [BUG FIXED]fix bug of CACHED in kmem -i show memory [外部邮件] 此邮件来源于小米公司外部，请谨慎处理。若对邮件安全性存疑，请将邮件转发给misec(a)xiaomi.xn--com-iw3ew31vyqjqpq On 12/1/23 16:30, 薛国伦 wrote: > Hi kazu: > > > I found that vmlinux of GKI kernel-6.1 which is newest version > in links below, it can make sure that nr_swapper_spaces not found. > > > https://ci.android.com/builds/submitted/11087000/kernel_aarch64/latest?hl... > <https://ci.android.com/builds/submitted/11087000/kernel_aarch64/latest?hl... > > > Download vmlinux in links and run: readelf -a vmlinux | grep > nr_swapper_spaces > It's weird, I downloaded the vmlinux from the above link, got the nr_swapper_spaces: $ md5sum vmlinux 7d47aa96b3812e6ca607de7e297307a1  vmlinux $ strings vmlinux |grep nr_swapper_spaces nr_swapper_spaces nr_swapper_spaces nr_swapper_spaces $ readelf -a vmlinux |grep nr_swapper_spaces   17111: c000000001856810   108 OBJECT  LOCAL  DEFAULT   47 nr_swapper_spaces Has the vmlinux been updated again? Thanks Lianbo > > can not find this symbol. > > > Thanks！ > Best Regards > ------------------------------------------------------------------------ > *From:* 薛国伦 > *Sent:* Friday, December 1, 2023 4:07:08 PM > *To:* HAGIO KAZUHITO(萩尾　一仁); devel(a)lists.crash-utility.osci.io > *Cc:* Lianbo Jiang > *Subject:* Re: [External Mail]Re: [Crash-utility] [BUG FIXED]fix bug > of CACHED in kmem -i show memory > > Hi kazu: > > > 1. I know that kernel have nr_swapper_spaces since kernel 4.11 which > brought into kernel with struct address_space *swapper_spaces[] > > my team think GKI vmlinux did not have nr_swapper_spaces this symbol, > may due to compile rule changed in AOSP code. > > we will try to find the root cause of vmlinux without symbol name > nr_swappera_space. > > >      >> RELEASE: 6.1.25-android14-11-maybe-dirty-qki-consolidate >      >> crash> nr_swapper_spaces >      >> crash: command not found: nr_swapper_spaces > > 2. I printf log of crash when execute kmem -i, it run into branch of > "symbol_exists("swapper_spaces")", also can not find nr_swapper_spaces > > > if (symbol_exists("nr_swapper_spaces") { > >     ...... > > } else if (symbol_exists("swapper_spaces") { > >     ...... > > } else if (symbol_exists("swapper_space") { > >     ...... > > } > > > 3. using my patch, it can fix output log of kmem -i which CACHED show > not right. > > > Fix before: > crash> kmem -i >                  PAGES        TOTAL      PERCENTAGE >     TOTAL MEM  2854115      10.9 GB         ---- >          FREE   169699     662.9 MB    5% of TOTAL MEM >          USED  2684416      10.2 GB   94% of TOTAL MEM >        SHARED   891094       3.4 GB   31% of TOTAL MEM >       BUFFERS      329       1.3 MB    0% of TOTAL MEM > *       CACHED  873327085626  3331478.4 GB  30598875% of TOTAL MEM* >          SLAB   230128     898.9 MB    8% of TOTAL MEM > > Fix after: > crash> kmem -i >                  PAGES        TOTAL      PERCENTAGE >     TOTAL MEM  2854115      10.9 GB         ---- >          FREE   169699     662.9 MB    5% of TOTAL MEM >          USED  2684416      10.2 GB   94% of TOTAL MEM >        SHARED   891094       3.4 GB   31% of TOTAL MEM >       BUFFERS      329       1.3 MB    0% of TOTAL MEM > *       CACHED  1729018       6.6 GB   60% of TOTAL MEM* >          SLAB   230128     898.9 MB    8% of TOTAL MEM > > > I think crash tools without my patch, maybe miss some situation like > this which symbol miss in kenrel vmlinux. > I think that using both branch of symbol_exist("nr_swapper_spaces") > and symbol_exists("swapper_spaces") means to double check > the situation of all kinds of kernel and vmlinux. > It seen that bring my patch can deal with more unusual situation and > make crash tool more compatible. > > > Thanks！ > Best Regards > > ------------------------------------------------------------------------ > *From:* HAGIO KAZUHITO(萩尾　一仁) <k-hagio-ab(a)nec.com&gt; > *Sent:* Friday, December 1, 2023 3:08:03 PM > *To:* 薛国伦; devel(a)lists.crash-utility.osci.io > *Cc:* Lianbo Jiang > *Subject:* Re: [External Mail]Re: [Crash-utility] [BUG FIXED]fix bug > of CACHED in kmem -i show memory > [外部邮件] > 此邮件来源于小米公司外部，请谨慎处理。若对邮件安全性存疑，请将邮件转发给misec(a)xiaomi.xn--com-iw3ew31vyqjqpq > > On 2023/11/30 22:05, 薛国伦 wrote: > > Hi kazu: > > > > > > 1. I found that vmlinux of kernel-6.1 did not have symbol > nr_swapper_spaces but only have swapper_spaces > > > > Also check in GKI vmlinux, can not find nr_swapper_spaces > > Hmm, upstream kernel 6.1 has it. > > $ git show v6.1:mm/swap_state.c > > struct address_space *swapper_spaces[MAX_SWAPFILES] __read_mostly; > static unsigned int nr_swapper_spaces[MAX_SWAPFILES] __read_mostly; > > > > > It may have some problem in symbol of nr_swapper_spaces > > > > > > 2. I think that crash tools will check nr_swapper_spaces first and > then check *swapper_spaces, swaper_space[] last. > > > > so first check nr_swapper_spaces not found, crash tool can use > *swapper_spaces to enhance compatibility. > > > > The patch i send can resolve this situation which nr_swapper_spaces > symbols can not found. > > But I cannot determine whether your patch is correct and should be > applied, without kernel patches or the cause of no nr_swapper_spaces. > Could you please find the information (e.g. links) of the related kernel > patches? > > Thanks, > Kazu > #/******本邮件及其附件含有小米公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ > This e-mail and its attachments contain confidential information from > XIAOMI, which is intended only for the person or entity whose address > is listed above. 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